LAN Switching Configuration Guide, Cisco IOS Release 12.4T
Cisco HWIC-4ESW and HWIC-D-9ESW EtherSwitch Interface Cards
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Cisco HWIC-4ESW and HWIC-D-9ESW EtherSwitch Interface Cards

Contents

Cisco HWIC-4ESW and HWIC-D-9ESW EtherSwitch Interface Cards

Last Updated: December 8, 2011

This document provides configuration tasks for the 4-port Cisco HWIC-4ESW and the 9-port Cisco HWIC-D-9ESW EtherSwitch high-speed WAN interface cards (HWICs) hardware feature supported on the Cisco 1800 (modular), Cisco 2800, and Cisco 3800 series integrated services routers.

Cisco EtherSwitch HWICs are 10/100BASE-T Layer 2 Ethernet switches with Layer 3 routing capability. (Layer 3 routing is forwarded to the host and is not actually performed at the switch.) Traffic between different VLANs on a switch is routed through the router platform. Any one port on a Cisco EtherSwitch HWIC may be configured as a stacking port to link to another Cisco EtherSwitch HWIC or EtherSwitch network module in the same system. An optional power module can also be added to provide inline power for IP telephones. The HWIC-D-9ESW HWIC requires a double-wide card slot.

This hardware feature does not introduce any new or modified Cisco IOS commands.

Finding Feature Information

Your software release may not support all the features documented in this module. For the latest feature information and caveats, see the release notes for your platform and software release. To find information about the features documented in this module, and to see a list of the releases in which each feature is supported, see the Feature Information Table at the end of this document.

Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to www.cisco.com/go/cfn. An account on Cisco.com is not required.

Prerequisites for EtherSwitch HWICs

  • Configuration of IP routing. See the Cisco IOS IP Routing: Protocol-Independent Configuration Guide for the Cisco IOS Release you are using.
  • Use of the Cisco IOS T release, beginning with Cisco IOS Release 12.3(8)T4 or later for Cisco HWIC-4ESW and Cisco HWIC-D-9ESW support. (See the Cisco IOS documentation.)

Restrictions for EtherSwitch HWICs

  • No more than two Ethernet Switch HWICs or network modules must be installed in a host router. Multiple Ethernet Switch HWICs or network modules installed in a host router will not act independently of each other. They must be stacked, as they will not work at all otherwise.
  • The ports of a Cisco EtherSwitch HWIC must not be connected to the Fast Ethernet/Gigabit onboard ports of the router.
  • There must not be inline power on the ninth port (port 8) of the HWIC-D-9ESW card.
  • There must not be Auto MDIX support on the ninth port (port 8) of the HWIC-D-9ESW card when either speed or duplex is not set to auto.
  • There must not be support for online insertion/removal (OIR) of the EtherSwitch HWICs.
  • When Ethernet Switches have been installed and configured in a host router, OIR of the CompactFlash memory card in the router must not occur. OIR of the CompactFlash memory card will compromise the configuration of the Ethernet Switches.
  • VTP pruning is not supported.
  • There is a limit of 200 secure MAC addresses per module that can be supported by an EtherSwitch HWIC.
  • Maximum traffic for a secure MAC address is 8 Mb/s.

Prerequisites for Installing Two Ethernet Switch Network Modules in a Single Chassis

A maximum of two Ethernet switch network modules can be installed in a single chassis. If two Ethernet switch network modules of any type are installed in the same chassis, the following configuration requirements must be met:

  • Both Ethernet switch network modules must have an optional Gigabit Ethernet expansion board installed.
  • An Ethernet crossover cable must be connected to the two Ethernet switch network modules using the optional Gigabit Ethernet expansion board ports.
  • Intrachassis stacking for the optional Gigabit Ethernet expansion board ports must be configured. For information about intrachassis stacking configuration, see the 16- and 36-Port Ethernet Switch Module for Cisco 2600 Series, Cisco 3600 Series, and Cisco 3700 Series feature module.

Note


Without this configuration and connection, duplications will occur in the VLAN databases, and unexpected packet handling may occur.

Information About EtherSwitch HWICs

VLANs

For conceptual information about VLANs, see the "VLANs" section of the EtherSwitch Network Module .

Inline Power for Cisco IP Phones

For conceptual information about inline power for Cisco IP phones, see the "Inline Power for Cisco IP Phones" section of the EtherSwitch Network Module

Layer 2 Ethernet Switching

For conceptual information about Layer 2 Ethernet switching, see the "Layer 2 Ethernet Switching" section of the EtherSwitch Network Module .

802.1x Authentication

For conceptual information about 802.1x authentication, see the "802.1x Authentication" section of the EtherSwitch Network Module .

Spanning Tree Protocol

For conceptual information about Spanning Tree Protocol, see the "Using the Spanning Tree Protocol with the EtherSwitch Network Module" section of the EtherSwitch Network Module .

Cisco Discovery Protocol

For conceptual information about Cisco Discovery Protocol, see the "Cisco Discovery Protocol" section of the EtherSwitch Network Module .

Switched Port Analyzer

For conceptual information about a switched port analyzer, see the "Switched Port Analyzer" section of the EtherSwitch Network Module .

IGMP Snooping

For conceptual information about IGMP snooping, see the "IGMP Snooping" section of the EtherSwitch Network Module.

Storm Control

For conceptual information about storm control, see the "Storm Control" section of the EtherSwitch Network Module .

Intrachassis Stacking

For conceptual information about intrachassis stacking, see the 'Intrachassis Stacking" section of the EtherSwitch Network Module .

Fallback Bridging

For conceptual information about fallback bridging, see the "Fallback Bridging" section of the EtherSwitch Network Module .

Default 802.1x Configuration

The table below shows the default 802.1x configuration.

Table 1 Default 802.1x Configuration

Feature

Default Setting

Authentication, authorization, and accounting (AAA)

Disabled.

RADIUS server

  • IP address
  • UDP authentication port
  • Key
  • None specified.
  • 1645.
  • None specified.

Per-interface 802.1x enable state

Disabled (force-authorized).

The port transmits and receives normal traffic without 802.1x-based authentication of the client.

Periodic reauthentication

Disabled.

Number of seconds between reauthentication attempts

3600

Quiet period

60 (period in seconds, that the switch remains in the quiet state following a failed authentication exchange with the client).

Retransmission time

30 (period in seconds that the switch should wait for a response to an EAP request/identity frame from the client before retransmitting the request).

Maximum retransmission number

2 (number of times that the switch will send an EAP-request/identity frame before restarting the authentication process).

Multiple host support

Disabled.

Client timeout period

30 (when relaying a request from the authentication server to the client, the period, in seconds, the switch waits for a response before retransmitting the request to the client). This setting is not configurable.

Authentication server timeout period

30 (when relaying a response from the client to the authentication server, the period in seconds, the switch waits for a reply before retransmitting the response to the server). This setting is not configurable.

802.1x Configuration Guidelines

These are the 802.1x authentication configuration guidelines:

  • When the 802.1x protocol is enabled, ports are authenticated before any other Layer 2 feature is enabled.
  • The 802.1x protocol is supported on Layer 2 static-access ports, but it is not supported on these port types:
    • Trunk port--If you try to enable 802.1x on a trunk port, an error message is displayed, and 802.1x is not enabled. If you try to change the mode of an 802.1x-enabled port to trunk, the port mode is not changed.
    • Switch Port Analyzer (SPAN) destination port--You can enable 802.1x on a port that is a SPAN destination port; however, 802.1x is disabled until the port is removed as a SPAN destination. You can enable 802.1x on a SPAN source port.

How to Configure EtherSwitch HWICs

Configuring VLANs

Adding a VLAN Instance

A total of 15 VLANs can be supported by an EtherSwitch HWIC.

Perform this task to configure a Fast Ethernet interface as Layer 2 access.

SUMMARY STEPS

1.    enable

2.    vlan database

3.    vlan vlan-id

4.    exit


DETAILED STEPS
  Command or Action Purpose
Step 1
enable


Example:

Router> enable

 

Enables privileged EXEC mode.

  • Enter your password if prompted.
 
Step 2
vlan database


Example:

Router# vlan database

 

Adds an ethernet VLAN and enters VLAN configuration mode.

 
Step 3
vlan vlan-id


Example:

Router(vlan)# vlan 1

 

Adds an Ethernet VLAN and enters VLAN configuration mode.

  • Enter the VLAN number .
 
Step 4
exit


Example:

Router(vlan)# exit

 

Updates the VLAN database, propagates it throughout the administrative domain, and returns to privileged EXEC mode.

 

Deleting a VLAN Instance from the Database

You cannot delete the default VLANs for the different media types: Ethernet VLAN 1 and FDDI or Token Ring VLANs 1002 to 1005.

Perform the following task to delete a VLAN from the database.

SUMMARY STEPS

1.   enable

2.   configure terminal

3.   vlan vlan-id

4.   no vlan vlan-id

5.   end


DETAILED STEPS
  Command or Action Purpose
Step 1
enable


Example:

Router> enable

 

Enables privileged EXEC mode.

  • Enter your password if prompted.
 
Step 2
configure terminal


Example:

Router# configure terminal

 

Enters global configuration mode.

 
Step 3
vlan vlan-id


Example:

Router(config)# vlan 3

 

Adds an Ethernet VLAN.

  • Enter the VLAN number.
 
Step 4
no vlan vlan-id


Example:

Router(config-vlan)# no vlan 3

 

Deletes an Ethernet VLAN.

  • Enter the VLAN number.
 
Step 5
end


Example:

Router(config-vlan)# end

 

Updates the VLAN database, propagates it throughout the administrative domain, and returns to privileged EXEC mode.

 

Configuring VLAN Trunking Protocol


Note


VTP pruning is not supported by EtherSwitch HWICs.

Configuring a VTP Server

When a switch is in VTP server mode, you can change the VLAN configuration and have it propagate throughout the network.

Perform this task to configure the switch as a VTP server.

SUMMARY STEPS

1.    enable

2.    vlan database

3.    vtp server

4.    vtp domain domain -name

5.    vtp password password -value

6.    exit


DETAILED STEPS
  Command or Action Purpose
Step 1
enable


Example:

Router> enable

 

Enables privileged EXEC mode.

  • Enter your password if prompted.
 
Step 2
vlan database


Example:

Router# vlan database

 

Enters VLAN configuration mode.

 
Step 3
vtp server


Example:

Router(vlan)# vtp server

 

Configures the switch as a VTP server.

 
Step 4
vtp domain domain -name


Example:

Router(vlan)# vtp domain distantusers

 

Defines the VTP domain name.

  • domain name- Enter the VTP domain name. Domain names can be a maximum of 32 characters.
 
Step 5
vtp password password -value


Example:

Router(vlan)# vtp password password1

 

(Optional) Sets a VTP domain password.

  • Specify a password. Passwords can be from 8 to 64 characters.
 
Step 6
exit


Example:

Router(vlan)# exit

 

Updates the VLAN database, propagates it throughout the administrative domain, exits VLAN configuration mode, and returns to privileged EXEC mode.

 

Configuring a VTP Client

When a switch is in VTP client mode, you cannot change the VLAN configuration on the switch. The client switch receives VTP updates from a VTP server in the management domain and modifies its configuration accordingly.

Perform this task to configure the switch as a VTP client.

SUMMARY STEPS

1.    enable

2.    vlan database

3.    vtp client

4.    exit


DETAILED STEPS
  Command or Action Purpose
Step 1
enable


Example:

.. Router> enable

 

Enables privileged EXEC mode.

  • Enter your password if prompted.
 
Step 2
vlan database


Example:

Router# vlan database

 

Adds an ethernet VLAN and enters VLAN configuration mode.

 
Step 3
vtp client


Example:

Router(vlan)# vtp client

 

Configures the switch as a VTP client.

 
Step 4
exit


Example:

Router(vlan)# exit

 

Updates the VLAN database, propagates it throughout the administrative domain, exits VLAN configuration mode and returns to privileged EXEC mode.

 

Disabling VTP (VTP Transparent Mode)

When you configure the switch as VTP transparent, you disable VTP on the switch. A VTP transparent switch does not send VTP updates and does not act on VTP updates received from other switches.

Perform this task disable VTP on the switch.

SUMMARY STEPS

1.    enable

2.    vlan database

3.    vtp transparent

4.    exit


DETAILED STEPS
  Command or Action Purpose
Step 1
enable


Example:

Router> enable

 

Enables privileged EXEC mode.

  • Enter your password if prompted.
 
Step 2
vlan database


Example:

Router# vlan database

 

Adds an ethernet VLAN and enters VLAN configuration mode.

 
Step 3
vtp transparent


Example:

Router(vlan)# vtp transparent

 

Configures VTP transparent mode.

 
Step 4
exit


Example:

Router(vlan)# exit

 

Updates the VLAN database, propagates it throughout the administrative domain, exits VLAN configuration mode, and returns to privileged EXEC mode.

 

Configuring Layer 2 Interfaces

Configuring a Range of Interfaces

Perform this task to configure a range of interfaces.

SUMMARY STEPS

1.    enable

2.    configure terminal

3.    interface range {macro macro-name | fastethernet interface-id [ - interface-id] | vlan vlan-id} [, fastethernet interface-id [ - interface-id] | vlan vlan-id]


DETAILED STEPS
  Command or Action Purpose
Step 1
enable


Example:

Router> enable

 

Enables privileged EXEC mode.

  • Enter your password if prompted.
 
Step 2
configure terminal


Example:

Router# configure terminal

 

Enters global configuration mode.

 
Step 3
interface range {macro macro-name | fastethernet interface-id [ - interface-id] | vlan vlan-id} [, fastethernet interface-id [ - interface-id] | vlan vlan-id]


Example:

Router(config)# interface range FastEthernet 0/1/0 - 0/1/3

 

Select the range of interfaces to be configured.

  • The space before the dash is required. For example, the command interface range fastethernet0/<slot>/0 -0/<slot>/3 is valid; the command interface range fastethernet0/<slot>/0-0/<slot>/3 is not valid.
  • You can enter one macro or up to five comma-separated ranges.
  • Comma-separated ranges can include both VLANs and physical interfaces.
  • You are not required to enter spaces before or after the comma.
  • The interface range command only supports VLAN interfaces that are configured with the interface vlan command.
 

Defining a Range Macro

Perform this task to define an interface range macro.

SUMMARY STEPS

1.    enable

2.    configure terminal

3.    define interface-range macro-name { fastethernet interface-id [ - interface-id] | {vlan vlan-id - vlan-id} | [, fastethernet interface-id [ - interface-id]


DETAILED STEPS
  Command or Action Purpose
Step 1
enable


Example:

Router> enable

 

Enables privileged EXEC mode.

  • Enter your password if prompted.
 
Step 2
configure terminal


Example:

Router# configure terminal

 

Enters global configuration mode.

 
Step 3
define interface-range macro-name { fastethernet interface-id [ - interface-id] | {vlan vlan-id - vlan-id} | [, fastethernet interface-id [ - interface-id]


Example:

Router(config)# define interface-range first_three FastEthernet0/1/0 - 2

 

Defines a range of macros.

  • Enter the macro name, along with the interface type and interface number, as appropriate.
 

Configuring Layer 2 Optional Interface Features

This section provides the following configuration information:

  • Configuring the Interface Speed, page 12 (optional)
  • Configuring the Interface Duplex Mode, page 13 (optional)
  • Configuring a Description for an Interface, page 14 (optional)
  • Configuring a Description for an Interface, page 14 (optional)
  • Configuring a Fast Ethernet Interface as a Layer 2 Trunk, page 15 (optional)
  • Configuring a Fast Ethernet Interface as Layer 2 Access, page 17 (optional)
Configuring the Interface Speed

Perform this task to set the interface speed.

When configuring an interface speed, note these guidelines:

  • If both ends of the line support autonegotiation, Cisco highly recommends the default auto negotiation settings.
  • If one interface supports auto negotiation and the other end does not, configure interface speed on both interfaces; do not use the auto setting on the supported side.
  • Both ends of the line need to be configured to the same setting; for example, both hard-set or both auto-negotiate. Mismatched settings are not supported.

Caution


Changing the interface speed might shut down and reenable the interface during the reconfiguration.


SUMMARY STEPS

1.    enable

2.    configure terminal

3.    interface fastethernet interface-id

4.    speed {10 | 100 | 1000 [negotiate] | auto[speed-list]}


DETAILED STEPS
  Command or Action Purpose
Step 1
enable


Example:

Router> enable

 

Enables privileged EXEC mode.

  • Enter your password if prompted.
 
Step 2
configure terminal


Example:

Router# configure terminal

 

Enters global configuration mode.

 
Step 3
interface fastethernet interface-id

Example:

Router(config)# interface fastethernet 0/1/0

 

Selects the interface to be configured and enters interface configuration mode.

  • Enter the interface number.
 
Step 4
speed {10 | 100 | 1000 [negotiate] | auto[speed-list]}


Example:

Router(config-if)# speed 100

 

Configures the speed for the interface.

  • Enter the desired speed.
 
What to Do Next


Note


If you set the interface speed to auto on a 10/100-Mbps Ethernet interface, both speed and duplex are automatically negotiated.

Configuring the Interface Duplex Mode

Perform the following steps to set the duplex mode of a Fast Ethernet interface.

When configuring an interface duplex mode, note these guidelines:

  • If both ends of the line support autonegotiation, Cisco highly recommends the default auto negotiation settings.
  • If one interface supports auto negotiation and the other end does not, configure duplex speed on both interfaces; do not use the auto setting on the supported side.
  • Both ends of the line need to be configured to the same setting, for example, both hard-set or both auto-negotiate. Mismatched settings are not supported.

Caution


Changing the interface duplex mode configuration might shut down and reenable the interface during the reconfiguration.


SUMMARY STEPS

1.   enable

2.   configure terminal

3.    interface fastethernet interface-id

4.   duplex [auto | full | half]

5.   end


DETAILED STEPS
  Command or Action Purpose
Step 1
enable


Example:

Router> enable

 

Enables privileged EXEC mode.

  • Enter your password if prompted.
 
Step 2
configure terminal


Example:

Router# configure terminal

 

Enters global configuration mode.

 
Step 3
interface fastethernet interface-id

Example:

Router(config)# interface fastethernet 0/1/0

 

Selects the interface to be configured.

  • Enter the interface number.

 
Step 4
duplex [auto | full | half]

Example:

Router(config-if)# duplex auto

 

Sets the duplex mode of the interface.

 
Step 5
end


Example:

Router(config-if)# end

 

Exits interface configuration mode.

 
What to Do Next


Note


If you set the port speed to auto on a 10/100-Mbps Ethernet interface, both speed and duplex are automatically negotiated. You cannot change the duplex mode of auto negotiation interfaces.

Configuring a Description for an Interface

You can add a description of an interface to help you remember its function. The description appears in the output of the following commands: show configuration, show running-config, and show interfaces.

Use the description command to add a description for an interface.

SUMMARY STEPS

1.   enable

2.   configure terminal

3.    interface fastethernet interface-id

4.   description string

5.   end


DETAILED STEPS
  Command or Action Purpose
Step 1
enable


Example:

Router> enable

 

Enables privileged EXEC mode.

  • Enter your password if prompted.
 
Step 2
configure terminal


Example:

Router# configure terminal

 

Enters global configuration mode.

 
Step 3
interface fastethernet interface-id

Example:

Router(config)# interface fastethernet 0/1/0

 

Selects the interface to be configured and enters interface configuration mode.

  • Enter the interface number.
 
Step 4
description string


Example:

Router(config-if)# description newinterface

 

Adds a description for the interface.

  • Enter a description for the interface.
 
Step 5
end


Example:

Router(config-if)# end

 

Exits interface configuration mode.

 
Configuring a Fast Ethernet Interface as a Layer 2 Trunk

Perform the following task to configure a Fast Ethernet interface as a Layer 2 trunk.

SUMMARY STEPS

1.   enable

2.   configure terminal

3.    interface fastethernet interface-id

4.   shutdown

5.    switchport mode trunk

6.    switchport trunk native vlan vlan-number

7.    switchport trunk allowed vlan {add | except | none | remove} vlan1[,vlan[,vlan[,...]]

8.   no shutdown

9.   end


DETAILED STEPS
  Command or Action Purpose
Step 1
enable


Example:

Router> enable

 

Enables privileged EXEC mode.

  • Enter your password if prompted.
 
Step 2
configure terminal


Example:

Router# configure terminal

 

Enters global configuration mode.

 
Step 3
interface fastethernet interface-id

Example:

Router(config)# interface fastethernet 0/1/0

 

Selects the interface to be configured and enters interface configuration mode.

  • Enter the interface number.
 
Step 4
shutdown


Example:

Router(config-if)# shutdown

 

(Optional) Shuts down the interface to prevent traffic flow until configuration is complete.

 
Step 5
switchport mode trunk

Example:

Router(config-if)# switchport mode trunk

 

Configures the interface as a Layer 2 trunk.

Note    Encapsulation is always dot1q.
 
Step 6
switchport trunk native vlan vlan-number

Example:

Router(config-if)# switchport trunk native vlan 1

 

(Optional) For 802.1Q trunks, specifies the native VLAN.

 
Step 7
switchport trunk allowed vlan {add | except | none | remove} vlan1[,vlan[,vlan[,...]]

Example:

Router(config-if)# switchport trunk allowed vlan add vlan1, vlan2, vlan3

 

(Optional) Configures the list of VLANs allowed on the trunk. All VLANs are allowed by default. You cannot remove any of the default VLANs from a trunk.

 
Step 8
no shutdown


Example:

Router(config-if)# no shutdown

 

Activates the interface. (Required only if you shut down the interface.)

 
Step 9
end


Example:

Router(config-if)# end

 

Exits interface configuration mode.

 
What to Do Next


Note


Ports do not support Dynamic Trunk Protocol (DTP). Ensure that the neighboring switch is set to a mode that will not send DTP.

Configuring a Fast Ethernet Interface as Layer 2 Access

Perform the following task to configure a Fast Ethernet interface as Layer 2 access.

SUMMARY STEPS

1.   enable

2.   configure terminal

3.    interface fastethernet interface-id

4.   shutdown

5.   switchport mode access

6.   switchport access vlan vlan-number

7.   no shutdown

8.   end


DETAILED STEPS
  Command or Action Purpose
Step 1
enable


Example:

Router> enable

 

Enables privileged EXEC mode.

  • Enter your password if prompted.
 
Step 2
configure terminal


Example:

Router# configure terminal

 

Enters global configuration mode.

 
Step 3
interface fastethernet interface-id

Example:

Router(config)# interface fastethernet 0/1/0

 

Selects the interface to be configured and enters interface configuration mode.

  • Enter the interface number.
 
Step 4
shutdown


Example:

Router(config-if)# shutdown

 

(Optional) Shuts down the interface to prevent traffic flow until configuration is complete.

 
Step 5
switchport mode access


Example:

Router(config-if)# switchport mode access

 

Configures the interface as a Layer 2 access.

 
Step 6
switchport access vlan vlan-number


Example:

Router(config-if)# switchport access vlan 1

 

For access ports, specifies the access VLAN.

  • Enter the VLAN number.
 
Step 7
no shutdown


Example:

Router(config-if)# no shutdown

 

Activates the interface.

  • Required only if you shut down the interface.
 
Step 8
end


Example:

Router(config-if)# end

 

Exits interface configuration mode.

 

Configuring 802.1x Authentication

Enabling 802.1x Authentication

To enable 802.1x port-based authentication, you must enable Authentication, Authorization, and Accounting (AAA) and specify the authentication method list. A method list describes the sequence and authentication methods to be queried to authenticate a user.

The software uses the first method listed to authenticate users; if that method fails to respond, the software selects the next authentication method in the method list. This process continues until there is successful communication with a listed authentication method or until all defined methods are exhausted. If authentication fails at any point in this cycle, the authentication process stops, and no other authentication methods are attempted.

For additional information about default 802.1x configuration, see "Default 802.1x Configuration" section on page 5 .

Perform the following task to configure 802.1x port-based authentication.

SUMMARY STEPS

1.   enable

2.   configure terminal

3.   aaa authentication dot1x {default | listname} method1 [method2...]

4.   interface interface-type interface-number

5.   dot1x port-control auto

6.   end

7.   show dot1x

8.   copy running-config startup-config


DETAILED STEPS
  Command or Action Purpose
Step 1
enable


Example:

Router> enable

 

Enables privileged EXEC mode.

  • Enter your password if prompted.
 
Step 2
configure terminal


Example:

Router# configure terminal

 

Enters global configuration mode.

 
Step 3
aaa authentication dot1x {default | listname} method1 [method2...]

Example:

Router(config)# aaa authentication dot1x default newmethod

 

Creates an 802.1x authentication method list.

  • To create a default list that is used when a named list is not specified in the authentication command, use the default keyword, followed by the methods that are to be used in default situations. The default method list is automatically applied to all interfaces.
  • Enter at least one of these keywords:
    • group radius--Use the list of all RADIUS servers for authentication.
    • none--Use no authentication. The client is automatically authenticated without the switch using the information supplied by the client.
 
Step 4
interface interface-type interface-number


Example:

Router(config)# interface fastethernet 0/1/3

 

Specifies the interface to be enabled for 802.1x authentication and enters interface configuration mode.

  • Enter the interface type and interface number.
 
Step 5
dot1x port-control auto


Example:

Router(config-if)# dot1x port-control auto

 

Enables 802.1x on the interface.

  • For feature interaction information with trunk, dynamic, dynamic-access, EtherChannel, secure, and SPAN ports, see the "802.1x Configuration Guidelines" section on page 19 .
 
Step 6
end


Example:

Router(config-if)# end

 

Exits interface configuration mode and returns to privileged EXEC mode.

 
Step 7
show dot1x


Example:

Router# show dot1x

 

Verifies your entries.

 
Step 8
copy running-config startup-config


Example:

Router# copy running-config startup-config

 

(Optional) Saves your entries in the configuration file.

 

Configuring the Switch-to-RADIUS-Server Communication

RADIUS security servers are identified by their hostname or IP address, hostname and specific UDP port numbers, or IP address and specific UDP port numbers. The combination of the IP address and UDP port number creates a unique identifier, which enables RADIUS requests to be sent to multiple UDP ports on a server at the same IP address. If two different host entries on the same RADIUS server are configured for the same service--for example, authentication--the second host entry configured acts as the failover backup to the first one. The RADIUS host entries are tried in the order that they were configured.

Perform the following task to configure the RADIUS server parameters on the switch.

SUMMARY STEPS

1.   enable

2.   configure terminal

3.   radius-server host {hostname | ip-address} auth-port port-number key string

4.   end

5.   show running-config

6.   copy running-config startup-config


DETAILED STEPS
  Command or Action Purpose
Step 1
enable


Example:

Router> enable

 

Enables privileged EXEC mode.

  • Enter your password if prompted.
 
Step 2
configure terminal


Example:

Router# configure terminal

 

Enters global configuration mode.

 
Step 3
radius-server host {hostname | ip-address} auth-port port-number key string

Example:

Router(config)# radius-server host hostseven auth-port 75 key newauthority75

 

Configures the RADIUS server parameters on the switch.

  • For hostname | ip-address, specify the hostname or IP address of the remote RADIUS server.
  • For auth-port port-number, specify the UDP destination port for authentication requests. The default is 1645.
  • For key string, specify the authentication and encryption key used between the switch and the RADIUS daemon running on the RADIUS server. The key is a text string that must match the encryption key used on the RADIUS server.
Note    Always configure the key as the last item in the radius-server host command syntax because leading spaces are ignored, but spaces within and at the end of the key are used. If you use spaces in the key, do not enclose the key in quotation marks unless the quotation marks are part of the key. This key must match the encryption used on the RADIUS daemon.
  • If you want to use multiple RADIUS servers, repeat this command.
 
Step 4
end


Example:

Router(config)# end

 

Exits global configuration mode and returns to privileged EXEC mode.

 
Step 5
show running-config


Example:

Router# show running-config

 

Verifies your entries.

 
Step 6
copy running-config startup-config


Example:

Router# copy running-config startup-config

 

(Optional) Saves your entries in the configuration file.

 
What to Do Next

To delete the specified RADIUS server, use the no radius-server host {hostname | ip-address} global configuration command.

You can globally configure the timeout, retransmission, and encryption key values for all RADIUS servers by using the radius-server host global configuration command. If you want to configure these options on a per-server basis, use the radius-server timeout, radius-server retransmit, and the radius-server key global configuration commands.

You also need to configure some settings on the RADIUS server. These settings include the IP address of the switch and the key string to be shared by both the server and the switch. For more information, refer to the RADIUS server documentation.

Troubleshooting Tips

To delete the specified RADIUS server, use the no radius server-host { hostname|ip-address} global configuration command. You can globally configure the timeout, retransmission, and encryption key values for all RADIUS servers by using the radius server host global configuration command. If you want to configure these options on a per-server basis, use the radius-server timeout, radius-server retransmit, and radius-server key in global configuration commands.

You also need to configure some settings on the RADIUS server. These settings include the IP address of the switch and the key string to be shared by both the server and the switch. For more information, refer to the RADIUS server documentation.

Enabling Periodic Reauthentication

You can enable periodic 802.1x client reauthentication and specify how often it occurs. If you do not specify a time period before enabling reauthentication, the number of seconds between reauthentication attempts is 3600 seconds.

Automatic 802.1x client reauthentication is a global setting and cannot be set for clients connected to individual ports.

Perform the following task to enable periodic reauthentication of the client and to configure the number of seconds between reauthentication attempts.

SUMMARY STEPS

1.   enable

2.   configure terminal

3.   dot1x re-authentication

4.   dot1x timeout re-authperiod seconds

5.   end

6.   show dot1x

7.   copy running-config startup-config


DETAILED STEPS
  Command or Action Purpose
Step 1
enable


Example:

Router> enable

 

Enables privileged EXEC mode.

  • Enter your password if prompted.
 
Step 2
configure terminal


Example:

Router# configure terminal

 

Enters global configuration mode.

 
Step 3
dot1x re-authentication


Example:

Router(config)# dot1x re-authentication

 

Enables periodic reauthentication of the client.

  • Periodic reauthentication is disabled by default.
 
Step 4
dot1x timeout re-authperiod seconds


Example:

Router(config)# dot1x timeout re-authperiod 120

 

Sets the number of seconds between reauthentication attempts.

  • The range is from 1 to 4294967295; the default is 3600 seconds.
  • This command affects the behavior of the switch only if periodic reauthentication is enabled
 
Step 5
end


Example:

Router(config)# end

 

Exits global configuration mode and returns to privileged EXEC mode.

 
Step 6
show dot1x


Example:

Router# show dot1x

 

Verifies your entries.

 
Step 7
copy running-config startup-config


Example:

Router# copy running-config startup-config

 

(Optional) Saves your entries in the configuration file.

 

Changing the Quiet Period

When the switch cannot authenticate the client, the switch remains idle for a set period of time, and then tries again. The idle time is determined by the quiet-period value. A failed authentication of the client might occur because the client provided an invalid password. You can provide a faster response time to the user by entering smaller number than the default.

Perform the following task to change the quiet period.

SUMMARY STEPS

1.   enable

2.   configure terminal

3.   dot1x timeout quiet-period seconds

4.   end

5.   show dot1x

6.   copy running-config startup-config


DETAILED STEPS
  Command or Action Purpose
Step 1
enable


Example:

Router> enable

 

Enables privileged EXEC mode.

  • Enter your password if prompted.
 
Step 2
configure terminal


Example:

Router# configure terminal

 

Enters global configuration mode.

 
Step 3
dot1x timeout quiet-period seconds


Example:

Router(config)# dot1x timeout quiet-period 120

 

Sets the number of seconds that the switch remains in the quiet state following a failed authentication exchange with the client.

  • The range is from 0 to 65535 seconds; the default is 60.
 
Step 4
end


Example:

Router(config-if)# end

 

Exits interface configuration mode and returns to privileged EXEC mode.

 
Step 5
show dot1x


Example:

Router# show dot1x

 

Verifies your entries.

 
Step 6
copy running-config startup-config


Example:

Router# copy running-config startup-config

 

(Optional) Saves your entries in the configuration file.

 

Changing the Switch-to-Client Retransmission Time

The client responds to the EAP-request/identity frame from the switch with an EAP-response/identity frame. If the switch does not receive this response, it waits a set period of time (known as the retransmission time), and then retransmits the frame.


Note


You should change the default value of this command only to adjust for unusual circumstances such as unreliable links or specific behavioral problems with certain clients and authentication servers.

Perform the following task to change the amount of time that the switch waits for client notification.

SUMMARY STEPS

1.   enable

2.   configure terminal

3.   dot1x timeout tx-period seconds

4.   end

5.   show dot1x

6.   copy running-config startup-config


DETAILED STEPS
  Command or Action Purpose
Step 1
enable


Example:

Router> enable

 

Enables privileged EXEC mode.

  • Enter your password if prompted.
 
Step 2
configure terminal


Example:

Router# configure terminal

 

Enters global configuration mode.

 
Step 3
dot1x timeout tx-period seconds


Example:

Router(config)# dot1x timeout tx-period seconds

 

Sets the number of seconds that the switch waits for a response to an EAP-request/identity frame from the client before retransmitting the request.

  • The range is from 1 to 65535 seconds; the default is 30.
 
Step 4
end


Example:

Router(config)# end

 

Exits global interface configuration mode and returns to privileged EXEC mode.

 
Step 5
show dot1x


Example:

Router# show dot1x

 

Verifies your entries.

 
Step 6
copy running-config startup-config


Example:

Router# copy running-config startup-config

 

(Optional) Saves your entries in the configuration file.

 

Setting the Switch-to-Client Frame-Retransmission Number

In addition to changing the switch-to-client retransmission time, you can change the number of times that the switch sends an EAP-request/identity frame (assuming no response is received) to the client before restarting the authentication process.


Note


You should change the default value of this command only to adjust for unusual circumstances such as unreliable links or specific behavioral problems with certain clients and authentication servers.

Perform the following task to set the switch-to-client frame-retransmission number.

SUMMARY STEPS

1.   enable

2.   configure terminal

3.   dot1x max-req count

4.   end

5.   show dot1x

6.   copy running-config startup-config


DETAILED STEPS
  Command or Action Purpose
Step 1
enable


Example:

Router> enable

 

Enables privileged EXEC mode.

  • Enter your password if prompted.
 
Step 2
configure terminal


Example:

Router# configure terminal

 

Enters global configuration mode.

 
Step 3
dot1x max-req count


Example:

Router(config)# dot1x max-req 5

 

Sets the number of times that the switch sends an EAP-request/identity frame to the client before restarting the authentication process.

  • The range is from 1 to 10; the default is 2.
 
Step 4
end


Example:

Router(config)# end

 

Exits global configuration mode and returns to privileged EXEC mode.

 
Step 5
show dot1x


Example:

Router# show dot1x

 

Verifies your entries.

 
Step 6
copy running-config startup-config


Example:

Router# copy running-config startup-config

 

(Optional) Saves your entries in the configuration file.

 

Enabling Multiple Hosts

You can attach multiple hosts to a single 802.1x-enabled port. In this mode, only one of the attached hosts must be successfully authorized for all hosts to be granted network access. If the port becomes unauthorized (reauthentication fails, and an EAPOL-logoff message is received), all attached clients are denied access to the network.

Follow these steps below to allow multiple hosts (clients) on an 802.1x-authorized port that has the dot1x port-control interface configuration command set to auto.

SUMMARY STEPS

1.   enable

2.   configure terminal

3.   interface interface-type interface-number

4.   dot1x multiple-hosts

5.   end

6.   show dot1x

7.   copy running-config startup-config


DETAILED STEPS
  Command or Action Purpose
Step 1
enable


Example:

Router> enable

 

Enables privileged EXEC mode.

  • Enter your password if prompted.
 
Step 2
configure terminal


Example:

Router# configure terminal

 

Enters global configuration mode.

 
Step 3
interface interface-type interface-number


Example:

Router(config)# interface fastethernet 0/1/2

 

Specifies the interface and enters interface configuration mode.

  • Enter the interface type and interface number.
 
Step 4
dot1x multiple-hosts


Example:

Router(config-if)# dot1x multiple-hosts

 

Allows multiple hosts (clients) on an 802.1x-authorized port.

  • Make sure that the dot1x port-control interface configuration command is set to auto for the specified interface.
 
Step 5
end


Example:

Router(config-if)# end

 

Exits interface configuration mode and returns to privileged EXEC mode.

 
Step 6
show dot1x


Example:

Router# show dot1x

 

Verifies your entries.

 
Step 7
copy running-config startup-config


Example:

Router# copy running-config startup-config

 

(Optional) Saves your entries in the configuration file.

 

Resetting the 802.1x Configuration to the Default Values

You can reset the 802.1x configuration to the default values with a single command.

Perform the following task to reset the 802.1x configuration to the default values.

SUMMARY STEPS

1.   enable

2.   configure terminal

3.   dot1x default

4.   end

5.   show dot1x

6.   copy running-config startup-config


DETAILED STEPS
  Command or Action Purpose
Step 1
enable


Example:

Router> enable

 

Enables privileged EXEC mode.

  • Enter your password if prompted.
 
Step 2
configure terminal


Example:

Router# configure terminal

 

Enters global configuration mode.

 
Step 3
dot1x default


Example:

Router(config)# dot1x default

 

Resets the configurable 802.1x parameters to the default values.

 
Step 4
end


Example:

Router(config)# end

 

Exits global configuration mode and returns to privileged EXEC mode.

 
Step 5
show dot1x


Example:

Router# show dot1x

 

Verifies your entries.

 
Step 6
copy running-config startup-config


Example:

Router# copy running-config startup-config

 

(Optional) Saves your entries in the configuration file.

 

Displaying 802.1x Statistics and Status

To display 802.1x statistics for all interfaces, use the show dot1x statistics privileged EXEC command. To display 802.1x statistics for a specific interface, use the show dot1x statistics interface interface-idprivileged EXEC command.

To display the 802.1x administrative and operational status for the switch, use the show dot1xprivileged EXEC command. To display the 802.1x administrative and operational status for a specific interface, use the show dot1x interface interface-id privileged EXEC command.

Configuring Spanning Tree

Enabling Spanning Tree

You can enable spanning tree on a per-VLAN basis. The switch maintains a separate instance of spanning tree for each VLAN (except on VLANs on which you disable spanning tree).

SUMMARY STEPS

1.   enable

2.   configure terminal

3.   spanning-tree vlan vlan-id

4.   end

5.   show spanning-tree vlan vlan-id


DETAILED STEPS
  Command or Action Purpose
Step 1
enable


Example:

Router> enable

 

Enables privileged EXEC mode.

  • Enter your password if prompted.
 
Step 2
configure terminal


Example:

Router# configure terminal

 

Enters global configuration mode.

 
Step 3
spanning-tree vlan vlan-id

Example:

Router(config)# spanning-tree vlan 200

 

Enables spanning tree on a per-VLAN basis

  • Enter the VLAN number.
 
Step 4
end


Example:

Router(config)# end

 

Exits global configuration mode and returns to privileged EXEC mode.

 
Step 5
show spanning-tree vlan vlan-id


Example:

Router# show spanning-tree vlan 200

 

Verifies spanning tree configuration.

  • Enter the VLAN number.
 

Configuring Spanning Tree Port Priority

Perform the following task to configure the spanning tree port priority of an interface.

SUMMARY STEPS

1.   enable

2.   configure terminal

3.   interface {ethernet | fastethernet} interface-id

4.   spanning-tree port-priority port-priority

5.   spanning-tree vlan vlan-id port-priority port-priority

6.   end

7.   show spanning-tree interface fastethernet interface-id


DETAILED STEPS
  Command or Action Purpose
Step 1
enable


Example:

Router> enable

 

Enables privileged EXEC mode.

  • Enter your password if prompted.
 
Step 2
configure terminal


Example:

Router# configure terminal

 

Enters global configuration mode.

 
Step 3
interface {ethernet | fastethernet} interface-id

Example:

Router(config)# interface fastethernet 0/1/6

 

Selects an interface to configure and enters interface configuration mode.

  • Enter the interface number.
 
Step 4
spanning-tree port-priority port-priority

Example:

Router(config-if)# spanning-tree port-priority 8

 

Configures the port priority for an interface.

  • The port-priority value can be from 4 to 252 in increments of 4.
  • Use the no form of this command to restore the defaults.
 
Step 5
spanning-tree vlan vlan-id port-priority port-priority

Example:

Router (config-if)# spanning-tree vlan vlan1 port-priority 12

 

Configures the priority for a VLAN.

 
Step 6
end


Example:

Router(config)# end

 

Exits global configuration mode and returns to privileged EXEC mode.

 
Step 7
show spanning-tree interface fastethernet interface-id


Example:

Router# show spanning-tree interface fastethernet 0/1/6

 

(Optional) Saves your entries in the configuration file.

 

Configuring Spanning Tree Port Cost

Spanning tree port costs are explained in the following section.

Port cost value calculations are based on the bandwidth of the port. There are two classes of values. Short (16-bit) values are specified by the IEEE 802.1D specification and range in value from 1 to 65535. Long (32-bit) values are specified by the IEEE 802.1t specification and range in value from 1 to 200,000,000.

Assigning Short Port Cost Values

You can manually assign port costs in the range of 1 to 65535. Default cost values are listed in Table 2 .

Table 2 Default Cost Values

Port Speed

Default Cost Value

10 Mbps

100

100 Mbps

19

Assigning Long Port Cost Values

You can manually assign port costs in the range of 1 to 200,000,000. Recommended cost values are listed in Table 3 .

Table 3 Recommended Cost Values

Port Speed

Recommended Value

Recommended Range

10 Mbps

2,000,000

200,000 to 20,000,000

100 Mbps

200,000

20,000 to 2,000,000

Perform the following task to configure the spanning tree port cost of an interface.

SUMMARY STEPS

1.   enable

2.   configure terminal

3.   interface {ethernet | fastethernet} interface-id

4.   spanning-tree cost port-cost

5.   spanning-tree vlan vlan-id cost port-cost

6.   end

7.   show spanning-tree interface fastethernet interface-id


DETAILED STEPS
  Command or Action Purpose
Step 1
enable


Example:

Router> enable

 

Enables privileged EXEC mode.

  • Enter your password if prompted.
 
Step 2
configure terminal


Example:

Router# configure terminal

 

Enters global configuration mode.

 
Step 3
interface {ethernet | fastethernet} interface-id

Example:

Router(config)# interface fastethernet 0/1/6

 

Selects an interface to configure and enters interface configuration mode.

  • Enter the interface number.
 
Step 4
spanning-tree cost port-cost

Example:

Router(config-if)# spanning-tree cost 2000

 

Configures the port cost for an interface.

  • The value of port-cost can be from 1 to 200,000,000 (1 to 65,535 in Cisco IOS Releases 12.1(2)E and earlier).
  • Use the no form of this command to restore the defaults.
 
Step 5
spanning-tree vlan vlan-id cost port-cost

Example:

Router(config-if)# spanning-tree vlan 200 cost 2000

 

Configures the VLAN port cost for an interface.

  • The value of port-cost can be from 1 to 65,535.
  • Use the no form of this command to restore the defaults.
 
Step 6
end


Example:

Router(config)# end

 

Returns to privileged EXEC mode.

 
Step 7
show spanning-tree interface fastethernet interface-id


Example:

Router# show spanning-tree interface fastethernet 0/1/6

 

(Optional) Saves your entries in the configuration file.

 

Configuring the Bridge Priority of a VLAN

Perform the following task to configure the spanning tree bridge priority of a VLAN.

SUMMARY STEPS

1.   enable

2.   configure terminal

3.   spanning-tree vlan vlan-id priority bridge-priority

4.   show spanning-tree vlan bridge


DETAILED STEPS
  Command or Action Purpose
Step 1
enable


Example:

Router> enable

 

Enables privileged EXEC mode.

  • Enter your password if prompted.
 
Step 2
configure terminal


Example:

Router# configure terminal

 

Enters global configuration mode.

 
Step 3
spanning-tree vlan vlan-id priority bridge-priority

Example:

Router(config)# spanning-tree vlan 200 priority 2

 

Configures the bridge priority of a VLAN. The bridge-priority value can be from 0 to 65535.

  • Use the no form of this command to restore the defaults.
Caution   

Exercise care when using this command. For most situations, spanning-tree vlan vlan-id root primary and the spanning-tree vlan vlan-id root secondary are the preferred commands to modify the bridge priority.

 
Step 4
show spanning-tree vlan bridge


Example:

Router(config-if)# spanning-tree cost 200

 

Verifies the bridge priority.

 

Configuring Hello Time

Perform the following tasks to configure the hello interval for the spanning tree.

SUMMARY STEPS

1.   enable

2.   configure terminal

3.   spanning-tree vlan vlan-id hello-time hello-time

4.   end


DETAILED STEPS
  Command or Action Purpose
Step 1
enable


Example:

Router> enable

 

Enables privileged EXEC mode.

  • Enter your password if prompted.
 
Step 2
configure terminal


Example:

Router# configure terminal

 

Enters global configuration mode.

 
Step 3
spanning-tree vlan vlan-id hello-time hello-time

Example:

Router(config)# spanning-tree vlan 200 hello-time 5

 

Configures the hello time of a VLAN.

  • Enter the VLAN number.
  • The hello-time value can be from 1 to 10 seconds.
  • Use the no form of this command to restore the defaults.
 
Step 4
end


Example:

Router(config)# end

 

Exits global configuration mode.

 

Configuring the Forward-Delay Time for a VLAN

Perform the following task to configure the forward delay for the spanning tree.

SUMMARY STEPS

1.   enable

2.   configure terminal

3.   spanning-tree vlan vlan-id forward-time forward-time

4.   end


DETAILED STEPS
  Command or Action Purpose
Step 1
enable


Example:

Router> enable

 

Enables privileged EXEC mode.

  • Enter your password if prompted.
 
Step 2
configure terminal


Example:

Router# configure terminal

 

Enters global configuration mode.

 
Step 3
spanning-tree vlan vlan-id forward-time forward-time


Example:

Router(config)# spanning-tree vlan 20 forward-time 5

 

Configures the forward time of a VLAN.

  • Enter the VLAN number.
  • The value of forward-time can be from 4 to 30 seconds.
  • Use the no form of this command to restore the defaults.
 
Step 4
end


Example:

Router(config)# end

 

Exits global configuration mode.

 

Configuring the Maximum Aging Time for a VLAN

Perform the following task to configure the maximum age interval for the spanning tree.

SUMMARY STEPS

1.   enable

2.   configure terminal

3.   spanning-tree vlan vlan-id max-age max-age

4.   end


DETAILED STEPS
  Command or Action Purpose
Step 1
enable


Example:

Router> enable

 

Enables privileged EXEC mode.

  • Enter your password if prompted.
 
Step 2
configure terminal


Example:

Router# configure terminal

 

Enters global configuration mode.

 
Step 3
spanning-tree vlan vlan-id max-age max-age

Example:

Router(config)# spanning-tree vlan 200 max-age 30

 

Configures the maximum aging time of a VLAN.

  • Enter the VLAN number.
  • The value of max-age can be from 6 to 40 seconds.
  • Use the no form of this command to restore the defaults.
 
Step 4
end


Example:

Router(config)# end

 

Exits global configuration mode.

 

Configuring the Root Bridge

The EtherSwitch HWIC maintains a separate instance of spanning tree for each active VLAN configured on the switch. A bridge ID, consisting of the bridge priority and the bridge MAC address, is associated with each instance. For each VLAN, the switch with the lowest bridge ID will become the root bridge for that VLAN.

To configure a VLAN instance to become the root bridge, the bridge priority can be modified from the default value (32768) to a significantly lower value so that the bridge becomes the root bridge for the specified VLAN. Use the spanning-tree vlan root command to alter the bridge priority.

The switch checks the bridge priority of the current root bridges for each VLAN. The bridge priority for the specified VLANs is set to 8192 if this value will cause the switch to become the root for the specified VLANs.

If any root switch for the specified VLANs has a bridge priority lower than 8192, the switch sets the bridge priority for the specified VLANs to 1 less than the lowest bridge priority.

For example, if all switches in the network have the bridge priority for VLAN 100 set to the default value of 32768, entering the spanning-tree vlan 100 root primary command on a switch will set the bridge priority for VLAN 100 to 8192, causing the switch to become the root bridge for VLAN 100.


Note


The root switch for each instance of spanning tree should be a backbone or distribution switch. Do not configure an access switch as the spanning tree primary root.

Use the diameter keyword to specify the Layer 2 network diameter (that is, the maximum number of bridge hops between any two end stations in the Layer 2 network). When you specify the network diameter, the switch automatically picks an optimal hello time, a forward delay time, and a maximum age time for a network of that diameter, which can significantly reduce the spanning tree convergence time. You can use the hello keyword to override the automatically calculated hello time.


Note


We recommend that you avoid configuring the hello time, forward delay time, and maximum age time manually after configuring the switch as the root bridge.

Perform the following task to configure the switch as the root.

SUMMARY STEPS

1.   enable

2.   configure terminal

3.   spanningtreevlanvlanidroot primary [diameterhops [hello-time seconds]]

4.   no spanning-tree vlan vlan-id

5.   show spanning-tree vlan vlan-id


DETAILED STEPS
  Command or Action Purpose
Step 1
enable


Example:

Router> enable

 

Enables privileged EXEC mode.

  • Enter your password if prompted.
 
Step 2
configure terminal


Example:

Router# configure terminal

 

Enters global configuration mode.

 
Step 3
spanningtreevlanvlanidroot primary [diameterhops [hello-time seconds]]

Example:

Router(config)# spanning-tree vlan 200 root primary

 

Configures a switch as the root switch.

  • Enter the VLAN number, along with any optional keywords or arguments as needed.
 
Step 4
no spanning-tree vlan vlan-id

Example:

Router(config)# spanning-tree vlan 200 root primary

 

Disables spanning tree on a per-VLAN basis.

  • Enter the VLAN number.
 
Step 5
show spanning-tree vlan vlan-id

Example:

Router(config)# show spanning-tree vlan 200

 

Verifies spanning tree on a per-VLAN basis.

  • Enter the VLAN number.
 

Configuring MAC Table Manipulation

Port security is implemented by providing the user with the option to secure a port by allowing only well-known MAC addresses to send in data traffic. Up to 200 secure MAC addresses per HWIC are supported.

Enabling Known MAC Address Traffic

Perform the following task to enable the MAC address secure option.

SUMMARY STEPS

1.   enable

2.   configure terminal

3.   mac-address-table secure mac-address fastethernet interface-id [vlan vlan-id] ]

4.   end

5.   show mac-address-table secure


DETAILED STEPS
  Command or Action Purpose
Step 1
enable


Example:

Router> enable

 

Enables privileged EXEC mode.

  • Enter your password if prompted.
 
Step 2
configure terminal


Example:

Router# configure terminal

 

Enters global configuration mode.

 
Step 3
mac-address-table secure mac-address fastethernet interface-id [vlan vlan-id] ]


Example:

Router(config)# mac-address-table secure 0000.0002.0001 fastethernet 0/1/1 vlan 2

 

Secures the MAC address traffic on the port.

  • Enter the MAC address, the fastethernet keyword, the interface number and any optional keywords and arguments as desired.
 
Step 4
end


Example:

Router(config)# end

 

Exits global configuration mode and returns to privileged EXEC mode.

 
Step 5
show mac-address-table secure


Example:

Router# show mac-address-table secure

 

Verifies the configuration.

 

Creating a Static Entry in the MAC Address Table

Perform the following task to create a static entry in the MAC address table.

SUMMARY STEPS

1.   enable

2.   configure terminal

3.   mac-address-table static mac-address fastethernet interface-id [vlan vlan-id]

4.   end

5.   show mac-address-table


DETAILED STEPS
  Command or Action Purpose
Step 1
enable


Example:

Router> enable

 

Enables privileged EXEC mode.

  • Enter your password if prompted.
 
Step 2
configure terminal


Example:

Router# configure terminal

 

Enters global configuration mode.

 
Step 3
mac-address-table static mac-address fastethernet interface-id [vlan vlan-id]

Example:

Router(config)# mac-address-table static 00ff.ff0d.2dc0 fastethernet 0/1/1

 

Creates a static entry in the MAC address table.

  • When the vlan-id is not specified, VLAN 1 is taken by default.

 
Step 4
end


Example:

Router(config)# end

 

Returns to privileged EXEC mode.

 
Step 5
show mac-address-table


Example:

Router# show mac-address-table

 

Verifies the MAC address table.

 

Configuring and Verifying the Aging Timer

The aging timer may be configured from 16 seconds to 4080 seconds, in 16-second increments.

Perform this task to configure the aging timer.

SUMMARY STEPS

1.    enable

2.    configure terminal

3.    mac -address-table aging-tim e time

4.    end

5.    show mac-address-table aging-time


DETAILED STEPS
  Command or Action Purpose
Step 1
enable


Example:

Router> enable

 

Enables privileged EXEC mode.

  • Enter your password if prompted.
 
Step 2
configure terminal


Example:

Router# configure terminal

 

Enters global configuration mode.

 
Step 3
mac -address-table aging-tim e time


Example:

Router(config)# mac-address-table aging-time 4080

 

Configures the MAC address aging timer age in seconds.

  • The range is from 0 to 10000 seconds.
 
Step 4
end


Example:

Router(config)# end

 

Returns to privileged EXEC mode.

 
Step 5
show mac-address-table aging-time


Example:

Router# show mac-address-table aging-time

 

Verifies the MAC address table.

 

Configuring Cisco Discovery Protocol

Enabling Cisco Discovery Protocol

To enable Cisco Discovery Protocol (CDP) globally, use the following commands.

SUMMARY STEPS

1.   enable

2.   configure terminal

3.   cdp run

4.   end

5.   show cdp


DETAILED STEPS
  Command or Action Purpose
Step 1
enable


Example:

Router> enable

 

Enables privileged EXEC mode.

  • Enter your password if prompted.
 
Step 2
configure terminal


Example:

Router# configure terminal

 

Enters global configuration mode.

 
Step 3
cdp run


Example:

Router(config)# cdp run

 

Enables CDP globally.

 
Step 4
end


Example:

Router(config)# end

 

Returns to privileged EXEC mode.

 
Step 5
show cdp


Example:

Router# show cdp

 

Verifies the CDP configuration.

 

Enabling CDP on an Interface

Perform this task to enable CDP on an interface.

SUMMARY STEPS

1.    enable

2.    configure terminal

3.    interface {ethernet | fastethernet} interface-id

4.    cdp enable

5.    end

6.    show cdp interface interface-id

7.    show cdp neighbors


DETAILED STEPS
  Command or Action Purpose
Step 1
enable


Example:

Router> enable

 

Enables privileged EXEC mode.

  • Enter your password if prompted.
 
Step 2
configure terminal


Example:

Router# configure terminal

 

Enters global configuration mode.

 
Step 3
interface {ethernet | fastethernet} interface-id


Example:

Router(config)# interface fastethernet 0/1/1

 

Selects an interface and enters interface configuration mode.

  • Enter the interface number.
 
Step 4
cdp enable


Example:

Router(config-if)# cdp enable

 

Enables CDP globally.

 
Step 5
end


Example:

Router(config-if)# end

 

Exits interface configuration mode.

 
Step 6
show cdp interface interface-id


Example:

Router# show cdp interface

 

Verifies the CDP configuration on the interface.

 
Step 7
show cdp neighbors


Example:

Router# show cdp neighbors

 

Verifies the information about the neighboring equipment.

 

Monitoring and Maintaining CDP

Perform this task to monitor and maintain CDP on your device.

SUMMARY STEPS

1.    enable

2.    clear cdp counter s

3.    clear cdp table

4.    show cdp

5.    show cdp entry entry-name [protocol | version]

6.    show cdp interface interface-id

7.    show cdp neighbors interface-id [detail]

8.    show cdp traffic


DETAILED STEPS
  Command or Action Purpose
Step 1
enable


Example:

Router> enable

 

Enables privileged EXEC mode.

  • Enter your password if prompted.
 
Step 2
clear cdp counter s


Example:

Router# clear cdp counters

 

(Optional) Resets the traffic counters to zero.

 
Step 3
clear cdp table


Example:

Router# clear cdp table

 

(Optional) Deletes the CDP table of information about neighbors.

 
Step 4
show cdp


Example:

Router# show cdp

 

(Optional) Verifies global information such as frequency of transmissions and the holdtime for packets being transmitted.

 
Step 5
show cdp entry entry-name [protocol | version]


Example:

Router# show cdp entry newentry

 

(Optional) Verifies information about a specific neighbor.

  • The display can be limited to protocol or version information.
 
Step 6
show cdp interface interface-id


Example:

Router# show cdp interface 0/1/1

 

(Optional) Verifies information about interfaces on which CDP is enabled.

  • Enter the interface number.
 
Step 7
show cdp neighbors interface-id [detail]


Example:

Router# show cdp neighbors 0/1/1

 

(Optional) Verifies information about neighbors.

  • The display can be limited to neighbors on a specific interface and can be expanded to provide more detailed information.
 
Step 8
show cdp traffic


Example:

Router# show cdp traffic

 

(Optional) Verifies CDP counters, including the number of packets sent and received and checksum errors.

 

Configuring the Switched Port Analyzer (SPAN)


Note


An EtherSwitch HWIC supports only one SPAN session. Either Tx or both Tx and Rx monitoring is supported.

Configuring the SPAN Sources

Perform the following task to configure the source for a SPAN session.

SUMMARY STEPS

1.   enable

2.   configure terminal

3.   monitor session 1 {source interface interface-id | vlan vlan-id} [, | - | rx | tx | both]


DETAILED STEPS
  Command or Action Purpose
Step 1
enable


Example:

Router> enable

 

Enables privileged EXEC mode.

  • Enter your password if prompted.
 
Step 2
configure terminal


Example:

Router# configure terminal

 

Enters global configuration mode.

 
Step 3
monitor session 1 {source interface interface-id | vlan vlan-id} [, | - | rx | tx | both]


Example:

Router(config)# monitor session 1 source interface fastethernet 0/3/1

 

Specifies the SPAN session (number 1), the source interfaces or VLANs, and the traffic direction to be monitored.

  • The example shows how to configure the SPAN session to monitor bidirectional traffic from source interface Fast Ethernet 0/3/1.
 

Configuring SPAN Destinations

Perform this task to configure the destination for a SPAN session.

SUMMARY STEPS

1.    enable

2.    configure terminal

3.    monitor session session-id {destination {interface interface-id} | {vlan vlan-id}} [, | - | rx | tx | both]

4.    end


DETAILED STEPS
  Command or Action Purpose
Step 1
enable


Example:

Router> enable

 

Enables privileged EXEC mode.

  • Enter your password if prompted.
 
Step 2
configure terminal


Example:

Router# configure terminal

 

Enters global configuration mode.

 
Step 3
monitor session session-id {destination {interface interface-id} | {vlan vlan-id}} [, | - | rx | tx | both]


Example:

Router(config)# monitor session 1 source interface fastethernet 0/3/1

 

Specifies the SPAN session (number 1), the source interfaces or VLANs, and the traffic direction to be monitored.

  • The example shows how to configure the SPAN session to monitor bidirectional traffic from source interface Fast Ethernet 0/3/1.
 
Step 4
end


Example:

Router(config)# end

 

Exits global configuration mode.

 

Configuring Power Management on the Interface

The HWICs can supply inline power to a Cisco 7960 IP phone, if necessary. The Cisco 7960 IP phone can also be connected to an AC power source and supply its own power to the voice circuit. When the Cisco 7960 IP phone is supplying its own power, an HWICs can forward IP voice traffic to and from the phone.

A detection mechanism on the HWIC determines whether it is connected to a Cisco 7960 IP phone. If the switch senses that there is no power on the circuit, the switch supplies the power. If there is power on the circuit, the switch does not supply it.

You can configure the switch never to supply power to the Cisco 7960 IP phone and to disable the detection mechanism.

Follow these steps to manage the powering of the Cisco IP phones.

SUMMARY STEPS

1.   enable

2.   configure terminal

3.   interface fastethernet interface-id

4.   power inline {auto | never}

5.   end

6.   show power inline


DETAILED STEPS
  Command or Action Purpose
Step 1
enable


Example:

Router> enable

 

Enables privileged EXEC mode.

  • Enter your password if prompted.
 
Step 2
configure terminal


Example:

Router# configure terminal

 

Enters global configuration mode.

 
Step 3
interface fastethernet interface-id


Example:

Router(config)# interface fastethernet 0/3/1

 

Selects a particular Fast Ethernet interface for configuration, and enters interface configuration mode.

  • Enter the interface number.
 
Step 4
power inline {auto | never}

Example:

Router(config-if)# power inline auto

 

Configures the port to supply inline power automatically to a Cisco IP phone.

  • Use never to permanently disable inline power on the port.
 
Step 5
end


Example:

Router(config-if)# end

 

Returns to privileged EXEC mode.

 
Step 6
show power inline


Example:

Router# show power inline

 

Displays power configuration on the ports.

 

Configuring IP Multicast Layer 3 Switching

Enabling IP Multicast Routing Globally

You must enable IP multicast routing globally before you can enable IP multicast Layer 3 switching on Layer 3 interfaces.

For complete information and procedures, see the following publications:


Note


See the Cisco command reference listing page for protocol-specific command references.

Use the following commands to enable IP multicast routing globally.

SUMMARY STEPS

1.   enable

2.   configure terminal

3.   ip multicast-routing


DETAILED STEPS
  Command or Action Purpose
Step 1
enable


Example:

Router> enable

 

Enables privileged EXEC mode.

  • Enter your password if prompted.
 
Step 2
configure terminal


Example:

Router# configure terminal

 

Enters global configuration mode.

 
Step 3
ip multicast-routing


Example:

Router(config)# ip multicast-routing

 

Enables IP multicast routing globally.

 

Enabling IP Protocol-Independent Multicast (PIM) on Layer 3 Interfaces

You must enable protocol-independent multicast (PIM) on the Layer 3 interfaces before enabling IP multicast Layer 3 switching functions on those interfaces.

Perform this task to enable IP PIM on a Layer 3 interface.

SUMMARY STEPS

1.    enable

2.    configure terminal

3.    interface vlan vlan-id

4.    ip pim {dense-mode | sparse-mode | sparse-dense-mode}


DETAILED STEPS
  Command or Action Purpose
Step 1
enable


Example:

Router> enable

 

Enables privileged EXEC mode.

  • Enter your password if prompted.
 
Step 2
configure terminal


Example:

Router# configure terminal

 

Enters global configuration mode.

 
Step 3
interface vlan vlan-id


Example:

Router(config)# interface vlan 1

 

Selects the interface to be configured and enters interface configuration mode.

 
Step 4
ip pim {dense-mode | sparse-mode | sparse-dense-mode}


Example:

Router(config-if)# ip pim sparse-dense mode

 

Enables IP PIM on a Layer 3 interface.

 

Verifying IP Multicast Layer 3 Hardware Switching Summary


Note


The show interface statistics command does not verify hardware-switched packets, only packets switched by software.

The show ip pim interface countcommand verifies the IP multicast Layer 3 switching enable state on IP PIM interfaces and verifies the number of packets received and sent on the interface.

Use the following show commands to verify IP multicast Layer 3 switching information for an IP PIM Layer 3 interface.

SUMMARY STEPS

1.    Router# show ip pim interface count

2.    Router# show ip mroute count

3.    Router# show ip interface vlan 1


DETAILED STEPS
Step 1   Router# show ip pim interface count

Example:
State:* - Fast Switched, D - Distributed Fast Switched
      H - Hardware Switching Enabled
Address          Interface            FS  Mpackets In/Out
10.0.0.1         VLAN1                *   151/0
Router#
Step 2   Router# show ip mroute count

Example:
IP Multicast Statistics
5 routes using 2728 bytes of memory
4 groups, 0.25 average sources per group
Forwarding Counts:Pkt Count/Pkts per second/Avg Pkt Size/Kilobits per second
Other counts:Total/RPF failed/Other drops(OIF-null, rate-limit etc)
 
Group:209.165.200.225 Source count:1, Packets forwarded: 0, Packets received: 66
  Source:10.0.0.2/32, Forwarding:0/0/0/0, Other:66/0/66
Group:209.165.200.226, Source count:0, Packets forwarded: 0, Packets received: 0
Group:209.165.200.227, Source count:0, Packets forwarded: 0, Packets received: 0
Group:209.165.200.228, Source count:0, Packets forwarded: 0, Packets received: 0
Router#
Note    A negative counter means that the outgoing interface list of the corresponding entry is NULL, and this indicates that this flow is still active.
Step 3   Router# show ip interface vlan 1

Example:
Vlan1 is up, line protocol is up
  Internet address is 10.0.0.1/24
  Broadcast address is 209.165.201.1
  Address determined by setup command
  MTU is 1500 bytes
  Helper address is not set
  Directed broadcast forwarding is disabled
  Multicast reserved groups joined:209.165.201.2 209.165.201.3 209.165.201.4 209.165.201.5
  Outgoing access list is not set
  Inbound  access list is not set
  Proxy ARP is enabled
  Local Proxy ARP is disabled
  Security level is default
  Split horizon is enabled
  ICMP redirects are always sent
  ICMP unreachables are always sent
  ICMP mask replies are never sent
  IP fast switching is enabled
  IP fast switching on the same interface is disabled
  IP Flow switching is disabled
  IP CEF switching is enabled
  IP CEF Fast switching turbo vector
  IP multicast fast switching is enabled
  IP multicast distributed fast switching is disabled
  IP route-cache flags are Fast, CEF
  Router Discovery is disabled
  IP output packet accounting is disabled
  IP access violation accounting is disabled
  TCP/IP header compression is disabled
  RTP/IP header compression is disabled
  Policy routing is disabled
  Network address translation is disabled
  WCCP Redirect outbound is disabled
  WCCP Redirect inbound is disabled
  WCCP Redirect exclude is disabled
  BGP Policy Mapping is disabled
Router#

Verifying the IP Multicast Routing Table

Use the show ip mroute command to verify the IP multicast routing table:

show ip mroute 224.10.103.10
IP Multicast Routing Table
Flags:D - Dense, S - Sparse, B - Bidir Group, s - SSM Group, C - Connected,
       L - Local, P - Pruned, R - RP-bit set, F - Register flag,
       T - SPT-bit set, J - Join SPT, M - MSDP created entry,
       X - Proxy Join Timer Running, A - Candidate for MSDP Advertisement,
       U - URD, I - Received Source Specific Host Report, Z - Multicast Tunnel,
       Y - Joined MDT-data group, y - Sending to MDT-data group
Outgoing interface flags:H - Hardware switched, A - Assert winner
Timers:Uptime/Expires
Interface state:Interface, Next-Hop or VCD, State/Mode
(*, 209.165.201.2), 00:09:21/00:02:56, RP 0.0.0.0, flags:DC
  Incoming interface:Null, RPF nbr 0.0.0.0
  Outgoing interface list:
    Vlan1, Forward/Sparse-Dense, 00:09:21/00:00:00, H
Router#

Note


The RPF-MFD flag indicates that the flow is completely hardware switched. The H flag indicates that the flow is hardware-switched on the outgoing interface.

Configuring IGMP Snooping

Enabling or Disabling IGMP Snooping

By default, IGMP snooping is globally enabled on the EtherSwitch HWIC. When globally enabled or disabled, it is enabled or disabled in all existing VLAN interfaces. By default, IGMP snooping is enabled on all VLANs, but it can be enabled and disabled on a per-VLAN basis.

Global IGMP snooping overrides the per-VLAN IGMP snooping capability. If global snooping is disabled, you cannot enable VLAN snooping. If global snooping is enabled, you can enable or disable snooping on a VLAN basis.

Perform this task to globally enable IGMP snooping on the EtherSwitch HWIC.

SUMMARY STEPS

1.    enable

2.    configure terminal

3.    ip igmp snooping

4.   

5.    ip igmp snooping vlan vlan-id

6.    end

7.    show ip igmp snooping

8.    copy running-config startup-config


DETAILED STEPS
  Command or Action Purpose
Step 1
enable


Example:

Router> enable

 

Enables privileged EXEC mode.

  • Enter your password if prompted.
 
Step 2
configure terminal


Example:

Router# configure terminal

 

Enters global configuration mode.

 
Step 3
ip igmp snooping


Example:

Router(config)# ip igmp snooping

 

Globally enables IGMP snooping in all existing VLAN interfaces.

 
Step 4

 
 
Step 5
ip igmp snooping vlan vlan-id


Example:

Router(config)# ip igmp snooping vlan 100

 

Globally enables IGMP snooping on a specific VLAN interface.

  • Enter the VLAN number.
 
Step 6
end


Example:

Router(config)# end

 

Returns to privileged EXEC mode.

 
Step 7
show ip igmp snooping


Example:

Router# show ip igmp snooping

 

Displays snooping configuration.

 
Step 8
copy running-config startup-config


Example:

Router# copy running-config startup-config

 

(Optional) Saves your configuration to the startup configuration.

 

Enabling IGMP Immediate-Leave Processing

When you enable IGMP Immediate-Leave processing, the EtherSwitch HWIC immediately removes a port from the IP multicast group when it detects an IGMP version 2 Leave message on that port. Immediate-Leave processing allows the switch to remove an interface that sends a Leave message from the forwarding table without first sending out group-specific queries to the interface. You should use the Immediate-Leave feature only when there is only a single receiver present on every port in the VLAN.

Use the following steps to enable IGMP Immediate-Leave processing.

SUMMARY STEPS

1.   enable

2.   configure terminal

3.   ip igmp snooping vlan vlan-id immediate-leave

4.   end

5.   show ip igmp snooping

6.   copy running-config startup-config


DETAILED STEPS
  Command or Action Purpose
Step 1
enable


Example:

Router> enable

 

Enables privileged EXEC mode.

  • Enter your password if prompted.
 
Step 2
configure terminal


Example:

Router# configure terminal

 

Enters global configuration mode.

 
Step 3
ip igmp snooping vlan vlan-id immediate-leave


Example:

Router(config)# ip igmp snooping vlan 1 immediate-leave

 

Enables IGMP Immediate-Leave processing on the VLAN interface.

  • Enter the VLAN number.
 
Step 4
end


Example:

Router(config)# end

 

Returns to privileged EXEC mode.

 
Step 5
show ip igmp snooping


Example:

Router# show ip igmp snooping

 

Displays snooping configuration.

 
Step 6
copy running-config startup-config


Example:

Router# copy running-config startup-config

 

(Optional) Saves your configuration to the startup configuration.

 

Statically Configuring an Interface to Join a Group

Ports normally join multicast groups through the IGMP report message, but you can also statically configure a host on an interface.

Follow the steps below to add a port as a member of a multicast group.

SUMMARY STEPS

1.   enable

2.   configure terminal

3.   ip igmp snooping vlan vlan-id static mac-address interface interface-id

4.   end

5.   show mac-address-table multicast [vlan vlan-id] [user | igmp-snooping] [count]

6.   show ip igmp snooping

7.   copy running-config startup-config


DETAILED STEPS
  Command or Action Purpose
Step 1
enable


Example:

Router> enable

 

Enables privileged EXEC mode.

  • Enter your password if prompted.
 
Step 2
configure terminal


Example:

Router# configure terminal

 

Enters global configuration mode.

 
Step 3
ip igmp snooping vlan vlan-id static mac-address interface interface-id


Example:

Router(config)# ip igmp snooping vlan 1 static 0100.5e05.0505 interface FastEthernet0/1/1

 

Enables IGMP snooping on the VLAN interface.

 
Step 4
end


Example:

Router(config)# end

 

Returns to privileged EXEC mode.

 
Step 5
show mac-address-table multicast [vlan vlan-id] [user | igmp-snooping] [count]

Example:

Router# show mac-address-table multicast vlan 1 igmp-snooping

 

Displays MAC address table entries for a VLAN.

  • vlan-id is the multicast group VLAN ID.
  • user displays only the user-configured multicast entries.
  • igmp-snooping displays entries learned via IGMP snooping.
  • count displays only the total number of entries for the selected criteria, not the actual entries.
 
Step 6
show ip igmp snooping


Example:

Router# show ip igmp snooping

 

Displays snooping configuration.

 
Step 7
copy running-config startup-config


Example:

Router# copy running-config startup-config

 

(Optional) Saves your configuration to the startup configuration.

 

Configuring a Multicast Router Port

Perform this task to enable a static connection to a multicast router.

SUMMARY STEPS

1.    enable

2.    configure terminal

3.    ip igmp snooping vlan vlan-id mrouter {interface interface-id | learn pim-dvmrp}

4.    end

5.    show ip igmp snooping

6.    show ip igmp snooping mrouter [vlan vlan-id]

7.    copy running-config startup-config


DETAILED STEPS
  Command or Action Purpose
Step 1
enable


Example:

Router> enable

 

Enables privileged EXEC mode.

  • Enter your password if prompted.
 
Step 2
configure terminal


Example:

Router# configure terminal

 

Enters global configuration mode.

 
Step 3
ip igmp snooping vlan vlan-id mrouter {interface interface-id | learn pim-dvmrp}


Example:

Router(config)# ip igmp snooping vlan1 interface Fa0/1/1 learn pim-dvmrp

 

Enables IGMP snooping on the VLAN interface and enables route discovery.

 
Step 4
end


Example:

Router(config)# end

 

Returns to privileged EXEC mode.

 
Step 5
show ip igmp snooping


Example:

Router# show ip igmp snooping

 

(Optional) Displays snooping configuration.

 
Step 6
show ip igmp snooping mrouter [vlan vlan-id]


Example:

Router# show ip igmp snooping mroute vlan vlan1

 

(Optional) Displays Mroute discovery information.

 
Step 7
copy running-config startup-config


Example:

Router# copy running-config startup-config

 

(Optional) Saves your configuration to the startup configuration.

 

Configuring Per-Port Storm Control

You can use these techniques to block the forwarding of unnecessary flooded traffic.

By default, unicast, broadcast, and multicast suppression is disabled.

Enabling Per-Port Storm Control

Perform this task to enable per-port storm control.

SUMMARY STEPS

1.    enable

2.    configure terminal

3.    interface interface-type interface-number

4.    storm-control {broadcast | multicast | unicast} level level-high [level-low]

5.    storm-control action shutdown

6.    end

7.    show storm-control [interface] [broadcast | multicast | unicast | history]


DETAILED STEPS
  Command or Action Purpose
Step 1
enable


Example:

Router> enable

 

Enables privileged EXEC mode.

  • Enter your password if prompted.
 
Step 2
configure terminal


Example:

Router# configure terminal

 

Enters global configuration mode.

 
Step 3
interface interface-type interface-number


Example:

Router(config)# interface fastethernet 0/3/1

 

Specifies the port to configure, and enters interface configuration mode.

  • Enter the interface type and interface number.

 
Step 4
storm-control {broadcast | multicast | unicast} level level-high [level-low]


Example:

Router(config-if)# Storm-control broadcast level 7

 

Configures broadcast, multicast, or unicast per-port storm control.

  • Specify the rising threshold level for either broadcast, multicast, or unicast traffic. The storm control action occurs when traffic utilization reaches this level.
  • (Optional) Specify the falling threshold level. The normal transmission restarts (if the action is filtering) when traffic drops below this level.
 
Step 5
storm-control action shutdown


Example:

Router(config-if)# Storm-control action shutdown

 

Selects the shutdown keyword to disable the port during a storm.

  • The default is to filter out the traffic.
 
Step 6
end


Example:

Router(config-if)# end

 

Returns to privileged EXEC mode.

 
Step 7
show storm-control [interface] [broadcast | multicast | unicast | history]


Example:

Router# show storm-control

 

(Optional) Verifies your entries.

 
What to Do Next


Note


If any type of traffic exceeds the upper threshold limit, all of the other types of traffic will be stopped.

Disabling Per-Port Storm Control

Perform this task to disable per-port storm control.

SUMMARY STEPS

1.    enable

2.    configure terminal

3.    interface interface-type interface-number

4.    no storm-control {broadcast | multicast| unicast} level level-high [level-low]

5.    no storm-control action shutdown

6.    end

7.    show storm-control [interface] [{broadcast | multicast | unicast | history}]


DETAILED STEPS
  Command or Action Purpose
Step 1
enable


Example:

Router> enable

 

Enables privileged EXEC mode.

  • Enter your password if prompted.
 
Step 2
configure terminal


Example:

Router# configure terminal

 

Enters global configuration mode.

 
Step 3
interface interface-type interface-number


Example:

Router(config)# interface fastethernet 0/3/1

 

Specifies the interface and enters interface configuration mode.

  • Enter the interface type and interface number.
 
Step 4
no storm-control {broadcast | multicast| unicast} level level-high [level-low]


Example:

Router(config-if)# no storm-control broadcast level 7

 

Disables per-port storm control.

 
Step 5
no storm-control action shutdown


Example:

Router(config-if)# no storm-control action shutdown

 

Disables the specified storm control action.

 
Step 6
end


Example:

Router(config-if)# end

 

Returns to privileged EXEC mode.

 
Step 7
show storm-control [interface] [{broadcast | multicast | unicast | history}]


Example:

Router# show storm-control

 

(Optional) Verifies your entries.

 

Configuring Stacking

Stacking is the connection of two switch modules resident in the same chassis so that they behave as a single switch. When a chassis is populated with two switch modules, the user must configure to operate in stacked mode. This is done by selecting one port from each switch module and configuring it to be a stacking partner. The user must then use a cable to connect the stacking partners from each switch module to physically stack the switch modules. Any one port in a switch module can be designated as the stacking partner for that switch module.

Perform this task to configure a pair of ports on two different switch modules as stacking partners.

SUMMARY STEPS

1.    enable

2.    configure terminal

3.    interface fastethernet interface-id

4.    no shutdown

5.    switchport stacking-partner interface fastethernet partner-interface-id

6.    exit

7.    interface fastethernet partner-interface-id

8.    no shutdown

9.    end


DETAILED STEPS
  Command or Action Purpose
Step 1
enable


Example:

Router> enable

 

Enables privileged EXEC mode.

  • Enter your password if prompted.
 
Step 2
configure terminal


Example:

Router# configure terminal

 

Enters global configuration mode.

 
Step 3
interface fastethernet interface-id


Example:

Router(config)# interface fastethernet 0/3/1

 

Enters interface configuration mode.

  • Enter the interface number.
 
Step 4
no shutdown


Example:

Router(config-if)# no shutdown

 

Activates the interface.

  • This step is required only if you shut down the interface.
 
Step 5
switchport stacking-partner interface fastethernet partner-interface-id


Example:

Router(config-if)# switchport stacking-partner interface FastEthernet partner-interface-id

 

Selects and configures the stacking partner port.

  • Enter the partner interface number.
  • To restore the defaults, use the no form of this command.
 
Step 6
exit


Example:

Router(config-if)# exit

 

Returns to privileged configuration mode.

 
Step 7
interface fastethernet partner-interface-id


Example:

Router# interface fastethernet 0/3/1

 

Specifies the partner-interface, and enters interface configuration mode.

  • Enter the partner interface number.
 
Step 8
no shutdown


Example:

Router(config-if)# no shutdown

 

Activates the stacking partner interface.

 
Step 9
end


Example:

Router(config-if)# end

 

Exits configuration mode.

 
What to Do Next


Note


Both stacking partner ports must have their speed and duplex parameters set to auto.

Caution


If stacking is removed, stacked interfaces will shutdown. Other nonstacked ports will be left unchanged.


Configuring Fallback Bridging

The table below shows the default fallback bridging configuration.

Table 4 Default Fallback Bridging Configuration

Feature

Default Setting

Bridge groups

None are defined or assigned to an interface. No VLAN-bridge STP is defined.

Switch forwards frames for stations that it has dynamically learned

Enabled.

Bridge table aging time for dynamic entries

300 seconds.

MAC-layer frame filtering

Disabled.

Spanning tree parameters:

  • Switch priority
  • Interface priority
  • Interface path cost
  • Hello BPDU interval
  • Forward-delay interval
  • Maximum idle interval

  • 32768
  • 128
  • 10 Mbps: 100 100 Mbps: 19 1000 Mbps: 4
  • 2 seconds
  • 20 seconds
  • 30 seconds

Creating a Bridge Group

To configure fallback bridging for a set of switched virtual interfaces (SVIs), these interfaces must be assigned to bridge groups. All interfaces in the same group belong to the same bridge domain. Each SVI can be assigned to only one bridge group.

Perform this task to create a bridge group and assign an interface to it.

SUMMARY STEPS

1.    enable

2.    configure terminal

3.    no ip routing

4.    bridge bridge-group protocol vlan-bridge

5.    interface interface-type interface-number

6.    bridge-group bridge-group

7.    end

8.    show vlan-bridge

9.    show running-config

10.    copy running-config startup-config


DETAILED STEPS
  Command or Action Purpose
Step 1
enable


Example:

Router> enable

 

Enables privileged EXEC mode.

  • Enter your password if prompted.
 
Step 2
configure terminal


Example:

Router# configure terminal

 

Enters global configuration mode.

 
Step 3
no ip routing


Example:

Router(config)# no ip routing

 

Disables IP routing.

 
Step 4
bridge bridge-group protocol vlan-bridge


Example:

Router(config)# bridge 100 protocol vlan-bridge

 

Assigns a bridge group number and specifies the VLAN-bridge spanning-tree protocol to run in the bridge group.

  • The ibm and dec keywords are not supported.
  • For bridge-group, specify the bridge group number. The range is from 1 to 255.
  • Frames are bridged only among interfaces in the same group.
 
Step 5
interface interface-type interface-number


Example:

Router(config)# interface vlan 0/3/1

 

Specifies the interface on which you want to assign the bridge group, and enters interface configuration mode.

  • The specified interface must be an SVI: a VLAN interface that you created by using the interface vlan vlan-id global configuration command.
  • These ports must have IP addresses assigned to them.
 
Step 6
bridge-group bridge-group


Example:

Router(config-if)# bridge-group 100

 

Assigns the interface to the bridge group.

  • By default, the interface is not assigned to any bridge group. An interface can be assigned to only one bridge group.
 
Step 7
end


Example:

Router(config-if)# end

 

Returns to privileged EXEC mode.

 
Step 8
show vlan-bridge


Example:

Router# show vlan-bridge

 

(Optional) Verifies forwarding mode.

 
Step 9
show running-config


Example:

Router# show running-config

 

(Optional) Verifies your entries.

 
Step 10
copy running-config startup-config


Example:

Router# copy running-config startup-config

 

(Optional) Saves your entries in the configuration file.

 

Preventing the Forwarding of Dynamically Learned Stations

By default, the switch forwards any frames for stations that it has dynamically learned. When this activity is disabled, the switch only forwards frames whose addresses have been statically configured into the forwarding cache.

Perform this task to prevent the switch from forwarding frames for stations that it has dynamically learned.

SUMMARY STEPS

1.    enable

2.    configure terminal

3.    no bridge bridge-group acquire

4.    end

5.    show running-config

6.    copy running-config startup-config


DETAILED STEPS
  Command or Action Purpose
Step 1
enable


Example:

Router> enable

 

Enables privileged EXEC mode.

  • Enter your password if prompted.
 
Step 2
configure terminal


Example:

Router# configure terminal

 

Enters global configuration mode.

 
Step 3
no bridge bridge-group acquire


Example:



Example:

Router(config)# no bridge 100 acquire

 

Enables the switch to stop forwarding any frames for stations that it has dynamically learned through the discovery process and to limit frame forwarding to statically configured stations.

  • The switch filters all frames except those whose destined-to addresses have been statically configured into the forwarding cache. To configure a static address, use the bridge bridge-group address mac-address {forward | discard} global configuration command.
  • For bridge-group, specify the bridge group number. The range is 1 to 255.
 
Step 4
end


Example:

Router(config)# end

 

Returns to privileged EXEC mode.

 
Step 5
show running-config


Example:

Router# show running-config

 

(Optional) Verifies your entry.

 
Step 6
copy running-config startup-config


Example:

Router# copy running-config startup-config

 

(Optional) Saves your entry in the configuration file.

 

Configuring the Bridge Table Aging Time

A switch forwards, floods, or drops packets based on the bridge table. The bridge table maintains both static and dynamic entries. Static entries are entered by the user. Dynamic entries are entered by the bridge learning process. A dynamic entry is automatically removed after a specified length of time, known as aging time, from the time the entry was created or last updated.

If you are likely to move hosts on a switched network, decrease the aging time to enable the switch to quickly adapt to the change. If hosts on a switched network do not continuously send packets, increase the aging time to keep the dynamic entries for a longer time and thus reduce the possibility of flooding when the hosts send again.

Perform this task to configure the aging time.

SUMMARY STEPS

1.    enable

2.    configure terminal

3.    bridge bridge-group aging-time seconds

4.    end

5.    show running-config

6.    copy running-config startup-config


DETAILED STEPS
  Command or Action Purpose
Step 1
enable


Example:

Router> enable

 

Enables privileged EXEC mode.

  • Enter your password if prompted.
 
Step 2
configure terminal


Example:

Router# configure terminal

 

Enters global configuration mode.

 
Step 3
bridge bridge-group aging-time seconds


Example:

Router(config)# bridge 100 aging-time 10000

 

Specifies the length of time that a dynamic entry remains in the bridge table from the time the entry was created or last updated.

  • For bridge-group, specify the bridge group number. The range is 1 to 255.
  • For seconds, enter a number from 0 to 1000000. The default is 300 seconds.
 
Step 4
end


Example:

Router(config)# end

 

Returns to privileged EXEC mode.

 
Step 5
show running-config


Example:

Router# show running-config

 

(Optional) Verifies your entry.

 
Step 6
copy running-config startup-config


Example:

Router# copy running-config startup-config

 

(Optional) Saves your entry in the configuration file.

 

Filtering Frames by a Specific MAC Address

A switch examines frames and sends them through the internetwork according to the destination address; a switch does not forward a frame back to its originating network segment. You can use the software to configure specific administrative filters that filter frames based on information other than the paths to their destinations.

You can filter frames with a particular MAC-layer station destination address. Any number of addresses can be configured in the system without a performance penalty.

Perform this task to filter by the MAC-layer address.

SUMMARY STEPS

1.    enable

2.    configure terminal

3.    bridge bridge-group address mac-address {forward | discard} [interface-id]

4.    end

5.    show running-config

6.    copy running-config startup-config


DETAILED STEPS
  Command or Action Purpose
Step 1
enable


Example:

Router> enable

 

Enables privileged EXEC mode.

  • Enter your password if prompted.
 
Step 2
configure terminal


Example:

Router# configure terminal

 

Enters global configuration mode.

 
Step 3
bridge bridge-group address mac-address {forward | discard} [interface-id]


Example:



Example:

Router(config)# bridge 1 address 0800.cb00.45e9 forward ethernet 1

 

Filters frames with a particular MAC-layer station source or destination address.

  • Enter the bridge-group number (the range is 1 to 255), the MAC address and the forward or discard keywords.

 
Step 4
end


Example:

Router(config)# end

 

Returns to privileged EXEC mode.

 
Step 5
show running-config


Example:

Router# show running-config

 

(Optional) Verifies your entry.

 
Step 6
copy running-config startup-config


Example:

Router# copy running-config startup-config

 

(Optional) Saves your entry in the configuration file.

 

Adjusting Spanning-Tree Parameters

You might need to adjust certain spanning-tree parameters if the default values are not suitable for your switch configuration. Parameters affecting the entire spanning tree are configured with variations of the bridge global configuration command. Interface-specific parameters are configured with variations of the bridge-group interface configuration command.

You can adjust spanning-tree parameters by performing any of the tasks in these sections:

  • Changing the Switch Priority, page 67
  • Changing the Interface Priority, page 68
  • Assigning a Path Cost, page 69
  • Adjusting BPDU Intervals, page 71
  • Adjusting the Interval Between Hello BPDUs, page 71
  • Changing the Forward-Delay Interval, page 72
  • Changing the Maximum-Idle Interval, page 73
  • Disabling the Spanning Tree on an Interface, page 74

Note


Only network administrators with a good understanding of how switches and STP function should make adjustments to spanning-tree parameters. Poorly planned adjustments can have a negative impact on performance.
Changing the Switch Priority

You can globally configure the priority of an individual switch when two switches tie for position as the root switch, or you can configure the likelihood that a switch will be selected as the root switch. This priority is determined by default; however, you can change it.

Perform this task to change the switch priority.

SUMMARY STEPS

1.    enable

2.    configure terminal

3.    bridge bridge-group priority number

4.    end

5.    show running-config

6.    copy running-config startup-config


DETAILED STEPS
  Command or Action Purpose
Step 1
enable


Example:

Router> enable

 

Enables privileged EXEC mode.

  • Enter your password if prompted.
 
Step 2
configure terminal


Example:

Router# configure terminal

 

Enters global configuration mode.

 
Step 3
bridge bridge-group priority number


Example:

Router(config)# bridge 100 priority 5

 

Changes the priority of the switch.

  • For bridge-group, specify the bridge group number. The range is 1 to 255.
  • For number, enter a number from 0 to 65535. The default is 32768. The lower the number, the more likely the switch will be chosen as the root.
 
Step 4
end


Example:

Router(config)# end

 

Returns to privileged EXEC mode.

 
Step 5
show running-config


Example:

Router# show running-config

 

Verifies your entry.

 
Step 6
copy running-config startup-config


Example:

Router# copy running-config startup-config

 

(Optional) Saves your entry in the configuration file.

 
Changing the Interface Priority

You can change the priority for an interface. When two switches tie for position as the root switch, you configure an interface priority to break the tie. The switch with the lower interface value is elected.

Perform this task to change the interface priority.

SUMMARY STEPS

1.    enable

2.    configure terminal

3.    interface interface-type interface-number

4.    bridge bridge-group priority number

5.    end

6.    show running-config

7.    copy running-config startup-config


DETAILED STEPS
  Command or Action Purpose
Step 1
enable


Example:

Router> enable

 

Enables privileged EXEC mode.

  • Enter your password if prompted.
 
Step 2
configure terminal


Example:

Router# configure terminal

 

Enters global configuration mode.

 
Step 3
interface interface-type interface-number


Example:

Router(config)# interface fastethernet 0/3/1

 

Specifies the interface to set the priority, and enters interface configuration mode.

  • Enter the interface type and interface number.
 
Step 4
bridge bridge-group priority number


Example:

Router(config-if)# bridge 100 priority 4

 

Changes the priority of the bridge.

  • Enter the bridge-group number and the priority number.
 
Step 5
end


Example:

Router(config-if)# end

 

Returns to privileged EXEC mode.

 
Step 6
show running-config


Example:

Router# show running-config

 

(Optional) Verifies your entry.

 
Step 7
copy running-config startup-config


Example:

Router# copy running-config startup-config

 

(Optional) Saves your entry in the configuration file.

 
Assigning a Path Cost

Each interface has a path cost associated with it. By convention, the path cost is 1000/data rate of the attached LAN, in Mbps.

Perform this task to assign a path cost.

SUMMARY STEPS

1.    enable

2.    configure terminal

3.    interface interface-type interface-number

4.    bridge bridge-group path-costs cost

5.    end

6.    show running-config

7.    copy running-config startup-config


DETAILED STEPS
  Command or Action Purpose
Step 1
enable


Example:

Router> enable

 

Enables privileged EXEC mode.

  • Enter your password if prompted.
 
Step 2
configure terminal


Example:

Router# configure terminal

 

Enters global configuration mode.

 
Step 3
interface interface-type interface-number


Example:

Router(config)# interface fastethernet 0/3/1

 

Specifies the interface to set the priority and enters interface configuration mode.

  • Enter the interface type and interface number.

 
Step 4
bridge bridge-group path-costs cost


Example:

Router(config-if)# bridge 100 pathcost 4

 

Changes the path cost.

  • Enter the bridge-group number and cost.
 
Step 5
end


Example:

Router(config-if)# end

 

Returns to privileged EXEC mode.

 
Step 6
show running-config


Example:

Router# show running-config

 

(Optional) Verifies your entry.

 
Step 7
copy running-config startup-config


Example:

Router# copy running-config startup-config

 

(Optional) Saves your entry in the configuration file.

 

Adjusting BPDU Intervals

You can adjust bridge protocol data unit (BPDU) intervals as described in these sections:

  • Adjusting the Interval Between Hello BPDUs, page 71 (optional)
  • Changing the Forward-Delay Interval, page 72 (optional)
  • Changing the Maximum-Idle Interval, page 73 (optional)

Note


Each switch in a spanning tree adopts the interval between hello BPDUs, the forward delay interval, and the maximum idle interval parameters of the root switch, regardless of what its individual configuration might be.
Adjusting the Interval Between Hello BPDUs

Perform this task to adjust the interval between hello BPDUs.

SUMMARY STEPS

1.    enable

2.    configure terminal

3.    bridge bridge-group hello-time seconds

4.    end

5.    show running-config

6.    copy running-config startup-config


DETAILED STEPS
  Command or Action Purpose
Step 1
enable


Example:

Router> enable

 

Enables privileged EXEC mode.

  • Enter your password if prompted.
 
Step 2
configure terminal


Example:

Router# configure terminal

 

Enters global configuration mode.

 
Step 3
bridge bridge-group hello-time seconds


Example:

Router(config)# bridge 100 hello-time 5

 

Specifies the interval between hello BPDUs.

  • For bridge-group, specify the bridge group number. The range is 1 to 255.
  • For seconds, enter a number from 1 to 10. The default is 2 seconds.
 
Step 4
end


Example:

Router(config)# end

 

Returns to privileged EXEC mode.

 
Step 5
show running-config


Example:

Router# show running-config

 

(Optional) Verifies your entry.

 
Step 6
copy running-config startup-config


Example:

Router# copy running-config startup-config

 

(Optional) Saves your entry in the configuration file.

 
Changing the Forward-Delay Interval

The forward-delay interval is the amount of time spent listening for topology change information after an interface has been activated for switching and before forwarding actually begins.

Perform this task to change the forward-delay interval.

SUMMARY STEPS

1.    enable

2.    configure terminal

3.    bridge bridge-group forward-time seconds

4.    end

5.    show running-config

6.    copy running-config startup-config


DETAILED STEPS
  Command or Action Purpose
Step 1
enable


Example:

Router> enable

 

Enables privileged EXEC mode.

  • Enter your password if prompted.
 
Step 2
configure terminal


Example:

Router# configure terminal

 

Enters global configuration mode.

 
Step 3
bridge bridge-group forward-time seconds


Example:

Router(config)# bridge 100 forward-time 25

 

Specifies the forward-delay interval.

  • For bridge-group, specify the bridge group number. The range is 1 to 255.
  • For seconds, enter a number from 10 to 200. The default is 20 seconds.
 
Step 4
end


Example:

Router(config)# end

 

Returns to privileged EXEC mode.

 
Step 5
show running-config


Example:

Router# show running-config

 

(Optional) Verifies your entry.

 
Step 6
copy running-config startup-config


Example:

Router# copy running-config startup-config

 

(Optional) Saves your entry in the configuration file.

 
Changing the Maximum-Idle Interval

If a switch does not hear BPDUs from the root switch within a specified interval, it recomputes the spanning-tree topology.

Perform this task to change the maximum-idle interval (maximum aging time).

SUMMARY STEPS

1.    enable

2.    configure terminal

3.    bridge bridge-group max-age seconds

4.    end

5.    show running-config

6.    copy running-config startup-config


DETAILED STEPS
  Command or Action Purpose
Step 1
enable


Example:

Router> enable

 

Enables privileged EXEC mode.

  • Enter your password if prompted.
 
Step 2
configure terminal


Example:

Router# configure terminal

 

Enters global configuration mode.

 
Step 3
bridge bridge-group max-age seconds


Example:

Router(config)# bridge 100 forward-time 25

 

Specifies the interval the switch waits to hear BPDUs from the root switch.

  • For bridge-group, specify the bridge group number. The range is 1 to 255.
  • For seconds, enter a number from 10 to 200. The default is 30 seconds.
 
Step 4
end


Example:

Router(config)# end

 

Returns to privileged EXEC mode.

 
Step 5
show running-config


Example:

Router# show running-config

 

(Optional) Verifies your entry.

 
Step 6
copy running-config startup-config


Example:

Router# copy running-config startup-config

 

(Optional) Saves your entry in the configuration file.

 
Disabling the Spanning Tree on an Interface

When a loop-free path exists between any two switched subnetworks, you can prevent BPDUs generated in one switching subnetwork from impacting devices in the other switching subnetwork, yet still permit switching throughout the network as a whole. For example, when switched LAN subnetworks are separated by a WAN, BPDUs can be prevented from traveling across the WAN link.

Perform this task to disable spanning tree on an interface.

SUMMARY STEPS

1.    enable

2.    configure terminal

3.    interface interface-type interface-number

4.    bridge-group bridge-group spanning-disabled

5.    end

6.    show running-config

7.    copy running-config startup-config


DETAILED STEPS
  Command or Action Purpose
Step 1
enable


Example:

Router> enable

 

Enables privileged EXEC mode.

  • Enter your password if prompted.
 
Step 2
configure terminal


Example:

Router# configure terminal

 

Enters global configuration mode.

 
Step 3
interface interface-type interface-number


Example:

Router(config)# interface fastethernet 0/3/1

 

Specifies the interface to set the priority and enters interface configuration mode.

  • Enter the interface type and interface number.
 
Step 4
bridge-group bridge-group spanning-disabled


Example:

Router(config-if)# bridge 100 spanning-disabled

 

Disables spanning tree on the interface.

  • For bridge-group, specify the bridge group number. The range is 1 to 255.

 
Step 5
end


Example:

Router(config-if)# end

 

Returns to privileged EXEC mode.

 
Step 6
show running-config


Example:

Router# show running-config

 

(Optional) Verifies your entry.

 
Step 7
copy running-config startup-config


Example:

Router# copy running-config startup-config

 

(Optional) Saves your entry in the configuration file.

 

Monitoring and Maintaining the Network

Perform this task to monitor and maintain the network.

SUMMARY STEPS

1.    enable

2.    clear bridge bridge-group

3.    show bridge

4.    end


DETAILED STEPS
  Command or Action Purpose
Step 1
enable


Example:

Router> enable

 

Enables privileged EXEC mode.

  • Enter your password if prompted.
 
Step 2
clear bridge bridge-group


Example:

Router# clear bridge bridge1

 

(Optional) Removes any learned entries from the forwarding database and clears the transmit and receive counts for any statically configured entries.

  • Enter the number of the bridge group.
 
Step 3
show bridge


Example:

Router# show bridge

 

(Optional) Displays classes of entries in the bridge forwarding database.

 
Step 4
end


Example:

Router# end

 

(Optional) Exits privileged EXEC mode.

 

Configuring Separate Voice and Data Subnets

The HWICs can automatically configure voice VLANs. This capability overcomes the management complexity of overlaying a voice topology onto a data network while maintaining the quality of voice traffic. With the automatically configured voice VLAN feature, network administrators can segment phones into separate logical networks, even though the data and voice infrastructure is physically the same. The voice VLAN feature places the phones into their own VLANs without the need for end-user intervention. A user can plug the phone into the switch, which provides with the necessary VLAN information.

For ease of network administration and increased scalability, network managers can configure the HWICs to support Cisco IP phones such that the voice and data traffic reside on separate subnets. You should always use separate VLANs when you are able to segment the existing IP address space of your branch office.

User priority bits in the 802.1p portion of the 802.1Q standard header are used to provide prioritization in Ethernet switches. This is a vital component in designing Cisco AVVID networks.

The HWICs provides the performance and intelligent services of Cisco IOS software for branch office applications. The HWICs can identify user applications--such as voice or multicast video--and classify traffic with the appropriate priority levels.

Follow these steps to automatically configure Cisco IP phones to send voice traffic on the voice VLAN ID (VVID) on a per-port basis (see the "Voice Traffic and VVID" section).

SUMMARY STEPS

1.    enable

2.    configure terminal

3.    interface interface-type interface-number

4.    switchport mode trunk

5.    switchport voice vlan vlan-id


DETAILED STEPS
  Command or Action Purpose
Step 1
enable


Example:

Router> enable

 

Enables privileged EXEC mode.

  • Enter your password if prompted.
 
Step 2
configure terminal


Example:

Router# configure terminal

 

Enters global configuration mode.

 
Step 3
interface interface-type interface-number


Example:

Router(config)# interface fastethernet 0/2/1

 

Specifies the port to be configured and enters interface configuration mode.

  • Enter the interface type and interface number.
 
Step 4
switchport mode trunk


Example:

Router(config-if)# switchport mode trunk

 

Configures the port to trunk mode.

 
Step 5
switchport voice vlan vlan-id


Example:

Router(config-if)# switchport voice vlan 100

 

Configures the voice port with a VVID that will be used exclusively for voice traffic.

  • Enter the VLAN number.
 

Configuring a Single Subnet for Voice and Data

For network designs with incremental IP telephony deployment, network managers can configure the HWICs so that the voice and data traffic coexist on the same subnet. This might be necessary when it is impractical either to allocate an additional IP subnet for IP phones or to divide the existing IP address space into an additional subnet at the remote branch, it might be necessary to use a single IP address space for branch offices. (This is one of the simpler ways to deploy IP telephony.)

This configuration approach must address two key considerations:

  • Network managers should ensure that existing subnets have enough available IP addresses for the new Cisco IP phones, each of which requires a unique IP address.
  • Administering a network with a mix of IP phones and workstations on the same subnet might pose a challenge.

Perform this task to automatically configure Cisco IP phones to send voice and data traffic on the same VLAN.

SUMMARY STEPS

1.    enable

2.    configure terminal

3.    interface interface-type interface-number

4.    switchport access vlan vlan-id

5.    end


DETAILED STEPS
  Command or Action Purpose
Step 1
enable


Example:

Router> enable

 

Enables privileged EXEC mode.

  • Enter your password if prompted.
 
Step 2
configure terminal


Example:

Router# configure terminal

 

Enters global configuration mode.

 
Step 3
interface interface-type interface-number


Example:

Router(config)# interface fastethernet 0/2/1

 

Specifies the port to be configured, and enters interface configuration mode.

  • Enter the interface type and interface number.

 
Step 4
switchport access vlan vlan-id

Example:

Router(config-if)# switchport access vlan 100

 

Sets the native VLAN for untagged traffic.

  • The value of vlan-id represents the ID of the VLAN that is sending and receiving untagged traffic on the port. Valid IDs are from 1 to 1001. Leading zeroes are not permitted.
 
Step 5
end


Example:

Router# end

 

Returns to privileged EXEC mode.

 

Managing the EtherSwitch HWIC

Adding Trap Managers

A trap manager is a management station that receives and processes traps. When you configure a trap manager, community strings for each member switch must be unique. If a member switch has an IP address assigned to it, the management station accesses the switch by using its assigned IP address.

By default, no trap manager is defined, and no traps are issued.

Perform this task to add a trap manager and community string.

SUMMARY STEPS

1.    enable

2.    configure terminal

3.    snmp-server host ip-address traps snmp vlan-membership

4.    end


DETAILED STEPS
  Command or Action Purpose
Step 1
enable


Example:

Router> enable

 

Enables privileged EXEC mode.

  • Enter your password if prompted.
 
Step 2
configure terminal


Example:

Router# configure terminal

 

Enters global configuration mode.

 
Step 3
snmp-server host ip-address traps snmp vlan-membership


Example:

Router(config)# snmp-server host 172.16.128.263 traps1 snmp vlancommunity1

 

Enters the trap manager IP address, community string, and the traps to generate.

 
Step 4
end


Example:

Router(config)# end

 

Returns to privileged EXEC mode.

 

Configuring IP Information

This section describes how to assign IP information on the HWICs. The following topics are included:

  • Assigning IP Information to the Switch, page 80
  • Removing IP Information From a Switch, page 81
  • Specifying a Domain Name and Configuring the DNS, page 82
Assigning IP Information to the Switch

You can use a BOOTP server to automatically assign IP information to the switch; however, the BOOTP server must be set up in advance with a database of physical MAC addresses and corresponding IP addresses, subnet masks, and default gateway addresses. In addition, the switch must be able to access the BOOTP server through one of its ports. At startup, a switch without an IP address requests the information from the BOOTP server; the requested information is saved in the switch running the configuration file. To ensure that the IP information is saved when the switch is restarted, save the configuration by entering the write memory command in privileged EXEC mode.

You can change the information in these fields. The mask identifies the bits that denote the network number in the IP address. When you use the mask to subnet a network, the mask is then referred to as a subnet mask. The broadcast address is reserved for sending messages to all hosts. The CPU sends traffic to an unknown IP address through the default gateway.

Perform this task to enter the IP information.

SUMMARY STEPS

1.    enable

2.    configure terminal

3.    interface interface-type interface-number

4.    ip address ip-address subnet-mask

5.    exit

6.    ip default-gateway ip-address

7.    end


DETAILED STEPS
  Command or Action Purpose
Step 1
enable


Example:

Router> enable

 

Enables privileged EXEC mode.

  • Enter your password if prompted.
 
Step 2
configure terminal


Example:

Router# configure terminal

 

Enters global configuration mode.

 
Step 3
interface interface-type interface-number


Example:

Router(config)# interface vlan 1

 

Specifies the interface (in this case, the VLAN) to which the IP information is assigned and enters interface configuration mode.

  • Enter the interface type and interface number.
  • VLAN 1 is the management VLAN, but you can configure any VLAN from IDs 1 to 1001.
 
Step 4
ip address ip-address subnet-mask

Example:

Router(config-if)# ip address 192.168.2.10 255.255.255.255

 

Specifies the IP address.

  • Enter the IP address and subnet mask.
 
Step 5
exit


Example:

Router(config)# exit

 

Returns to global configuration mode.

 
Step 6
ip default-gateway ip-address

Example:

Router# ip default-gateway 192.168.2.20

 

Sets the IP address of the default router.

  • Enter the IP address of the default router.
 
Step 7
end


Example:

Router# end

 

Returns to privileged EXEC mode.

 
Removing IP Information From a Switch

Use the following procedure to remove the IP information (such as an IP address) from a switch.


Note


Using the no ip address command in interface configuration mode disables the IP protocol stack and removes the IP information. Cluster members without IP addresses rely on the IP protocol stack being enabled.
SUMMARY STEPS

1.    enable

2.    configure terminal

3.    interface interface-type interface-number

4.    no ip address

5.    end


DETAILED STEPS
  Command or Action Purpose
Step 1
enable


Example:

Router> enable

 

Enables privileged EXEC mode.

  • Enter your password if prompted.
 
Step 2
configure terminal


Example:

Router# configure terminal

 

Enters global configuration mode.

 
Step 3
interface interface-type interface-number


Example:

Router(config)# interface vlan 1

 

Specifies the interface (in this case, the VLAN) to which the IP information is assigned and enters interface configuration mode.

  • Enter the interface type and interface number.
  • VLAN 1 is the management VLAN, but you can configure any VLAN from IDs 1 to 1001.
 
Step 4
no ip address


Example:

Router(config-if)# no ip address

 

Removes the IP address and subnet mask.

 
Step 5
end


Example:

Router(config-if)# end

 

Returns to privileged EXEC mode.

 
What to Do Next

DANGER

If you are removing the IP address through a telnet session, your connection to the switch will be lost .

Specifying a Domain Name and Configuring the DNS

Each unique IP address can have a host name associated with it. The Cisco IOS software maintains an EXEC mode and related Telnet support operations. This cache speeds the process of converting names to addresses.

IP defines a hierarchical naming scheme that allows a device to be identified by its location or domain. Domain names are pieced together with periods (.) as the delimiting characters. For example, Cisco Systems is a commercial organization that IP identifies by a com domain name, so its domain name is cisco.com. A specific device in this domain, the FTP system, for example, is identified as ftp.cisco.com.

To track domain names, IP has defined the concept of a domain name server (DNS), the purpose of which is to hold a cache (or database) of names mapped to IP addresses. To map domain names to IP addresses, you must first identify the host names and then specify a name server and enable the DNS, the Internet's global naming scheme that uniquely identifies network devices.

Specifying the Domain Name

You can specify a default domain name that the software uses to complete domain name requests. You can specify either a single domain name or a list of domain names. When you specify a domain name, any IP host name without a domain name has that domain name appended to it before being added to the host table.

Specifying a Name Server

You can specify up to six hosts that can function as a name server to supply name information for the DNS.

Enabling the DNS

If your network devices require connectivity with devices in networks for which you do not control name assignment, you can assign device names that uniquely identify your devices within the entire internetwork. The Internet's global naming scheme, the DNS, accomplishes this task. This service is enabled by default.

Enabling Switch Port Analyzer

You can monitor traffic on a given port by forwarding incoming and outgoing traffic on the port to another port in the same VLAN. A Switch Port Analyzer (SPAN) port cannot monitor ports in a different VLAN, and a SPAN port must be a static-access port. Any number of ports can be defined as SPAN ports, and any combination of ports can be monitored. SPAN is supported for up to 2 sessions.

Perform this task to enable SPAN.

SUMMARY STEPS

1.    enable

2.    configure terminal

3.    monitor session session-id {destination | source} {interface | vlan interface-id | vlan-id}} [, | - | both | tx | rx]

4.    end


DETAILED STEPS
  Command or Action Purpose
Step 1
enable


Example:

Router> enable

 

Enables privileged EXEC mode.

  • Enter your password if prompted.
 
Step 2
configure terminal


Example:

Router# configure terminal

 

Enters global configuration mode.

 
Step 3
monitor session session-id {destination | source} {interface | vlan interface-id | vlan-id}} [, | - | both | tx | rx]


Example:

Router(config)# monitor session session-id {destination | source} {interface | vlan interface-id | vlan-id}} [, | - | both | tx | rx]

 

Enables port monitoring for a specific session ("number").

  • Optionally, supply a SPAN destination interface and a source interface.
 
Step 4
end


Example:

Router(config)# end

 

Returns to privileged EXEC mode.

 
Disabling SPAN

Perform this task to disable SPAN.

SUMMARY STEPS

1.    enable

2.    configure terminal

3.    no monitor session session-id

4.    end


DETAILED STEPS
  Command or Action Purpose
Step 1
enable


Example:

Router> enable

 

Enables privileged EXEC mode.

  • Enter your password if prompted.
 
Step 2
configure terminal


Example:

Router# configure terminal

 

Enters global configuration mode.

 
Step 3
no monitor session session-id

Example:

Router(config)# no monitor session 37

 

Disables port monitoring for a specific session.

 
Step 4
end


Example:

Router(config)# end

 

Returns to privileged EXEC mode.

 

Managing the ARP Table

To communicate with a device (on Ethernet, for example), the software first must determine the 48-bit MAC or local data link address of that device. The process of determining the local data link address from an IP address is called address resolution.

The Address Resolution Protocol (ARP) associates a host IP address with the corresponding media or MAC addresses and VLAN ID. Taking an IP address as input, ARP determines the associated MAC address. Once a MAC address is determined, the IP-MAC address association is stored in an ARP cache for rapid retrieval. Then the IP datagram is encapsulated in a link-layer frame and sent over the network. Encapsulation of IP datagrams and ARP requests and replies on IEEE 802 networks other than Ethernet is specified by the Subnetwork Access Protocol (SNAP). By default, standard Ethernet-style ARP encapsulation (represented by the arpa keyword) is enabled on the IP interface.

When you manually add entries to the ARP table by using the CLI, you must be aware that these entries do not age and must be manually removed.

Managing the MAC Address Tables

This section describes how to manage the MAC address tables on the HWICs. The following topics are included:

  • Understanding MAC Addresses and VLANs
  • Changing the Address Aging Time
  • Configuring the Aging Time

The switch uses the MAC address tables to forward traffic between ports. All MAC addresses in the address tables are associated with one or more ports. These MAC tables include the following types of addresses:

  • Dynamic address--A source MAC address that the switch learns and then drops when it is not in use.
  • Secure address--A manually entered unicast address that is usually associated with a secured port. Secure addresses do not age.
  • Static address--A manually entered unicast or multicast address that does not age and that is not lost when the switch resets.

The address tables list the destination MAC address and the associated VLAN ID, module, and port number associated with the address. The following shows an example of a list of addresses as they would appear in the dynamic, secure, or static address table.

Router# show mac-address-table
Destination Address  Address Type  VLAN  Destination Port
-------------------  ------------  ----  --------------------
000a.000b.000c          Secure      1      FastEthernet0/1/8
000d.e105.cc70          Self        1      Vlan1
00aa.00bb.00cc          Static      1      FastEthernet0/1/0

All addresses are associated with a VLAN. An address can exist in more than one VLAN and have different destinations in each. Multicast addresses, for example, could be forwarded to port 1 in VLAN 1 and ports 9, 10, and 11 in VLAN 5.

Each VLAN maintains its own logical address table. A known address in one VLAN is unknown in another until it is learned or statically associated with a port in the other VLAN. An address can be secure in one VLAN and dynamic in another. Addresses that are statically entered in one VLAN must be static addresses in all other VLANs.

Dynamic addresses are source MAC addresses that the switch learns and then drops when they are not in use. Use the Aging Time field to define how long the switch retains unseen addresses in the table. This parameter applies to all VLANs.

Setting too short an aging time can cause addresses to be prematurely removed from the table. Then when the switch receives a packet for an unknown destination, it floods the packet to all ports in the same VLAN as the receiving port. This unnecessary flooding can impact performance. Setting too long an aging time can cause the address table to be filled with unused addresses; it can cause delays in establishing connectivity when a workstation is moved to a new port.

Perform this task to configure the dynamic address table aging time.

SUMMARY STEPS

1.    enable

2.    configure terminal

3.    mac-address-table aging-time seconds

4.    end


DETAILED STEPS
  Command or Action Purpose
Step 1
enable


Example:

Router> enable

 

Enables privileged EXEC mode.

  • Enter your password if prompted.
 
Step 2
configure terminal


Example:

Router# configure terminal

 

Enters global configuration mode.

 
Step 3
mac-address-table aging-time seconds

Example:

Router(config)# mac-address-table aging-time 30000

 

Enters the number of seconds that dynamic addresses are to be retained in the address table.

  • Valid entries are from 10 to 1000000.
 
Step 4
end


Example:

Router(config)# end

 

Returns to privileged EXEC mode.

 

Removing Dynamic Addresses

Follow these steps to remove a dynamic address entry.

SUMMARY STEPS

1.    enable

2.    configure terminal

3.    no mac-address-table dynamic hw-addr

4.    end


DETAILED STEPS
  Command or Action Purpose
Step 1
enable


Example:

Router> enable

 

Enables privileged EXEC mode.

  • Enter your password if prompted.
 
Step 2
configure terminal


Example:

Router# configure terminal

 

Enters global configuration mode.

 
Step 3
no mac-address-table dynamic hw-addr

Example:

Router(config)# no mac-address-table dynamic 0100.5e05.0505

 

Enters the MAC address to be removed from dynamic MAC address table.

 
Step 4
end


Example:

Router(config)# end

 

Returns to privileged EXEC mode.

 

Adding Secure Addresses

The secure address table contains secure MAC addresses and their associated ports and VLANs. A secure address is a manually entered unicast address that is forwarded to only one port per VLAN. If you enter an address that is already assigned to another port, the switch reassigns the secure address to the new port.

You can enter a secure port address even when the port does not yet belong to a VLAN. When the port is later assigned to a VLAN, packets destined for that address are forwarded to the port.


Note


When you change the VLAN ID for a port that is configured with a secure MAC address, you must reconfigure the secure MAC address to reflect the new VLAN association.

Perform this task to add a secure address.

SUMMARY STEPS

1.    enable

2.    configure terminal

3.    mac-address-table secure address hw-addr interface interface-idvlan vlan-id

4.    end


DETAILED STEPS
  Command or Action Purpose
Step 1
enable


Example:

Router> enable

 

Enables privileged EXEC mode.

  • Enter your password if prompted.
 
Step 2
configure terminal


Example:

Router# configure terminal

 

Enters global configuration mode.

 
Step 3
mac-address-table secure address hw-addr interface interface-idvlan vlan-id

Example:

Router(config)# mac-address-table secure address 0100.5e05.0505 interface 0/3/1 vlan vlan 1

 

Enters the MAC address, its associated port, and the VLAN ID.

 
Step 4
end


Example:

Router(config)# end

 

Returns to privileged EXEC mode.

 

Removing a Secure Address

Perform this task to remove a secure address.

SUMMARY STEPS

1.    enable

2.    configure terminal

3.    no mac-address-table secure hw-addr vlan vlan-id

4.    end


DETAILED STEPS
  Command or Action Purpose
Step 1
enable


Example:

Router> enable

 

Enables privileged EXEC mode.

  • Enter your password if prompted.
 
Step 2
configure terminal


Example:

Router# configure terminal

 

Enters global configuration mode.

 
Step 3
no mac-address-table secure hw-addr vlan vlan-id

Example:

Router(config)# no mac-address-table secure address 0100.5e05.0505 vlan vlan 1

 

Enters the secure MAC address, its associated port, and the VLAN ID to be removed.

 
Step 4
end


Example:

Router(config)# end

 

Returns to privileged EXEC mode.

 

Configuring Static Addresses

A static address has the following characteristics:

  • It is manually entered in the address table and must be manually removed.
  • It can be a unicast or multicast address.
  • It does not age and is retained when the switch restarts.

Because all ports are associated with at least one VLAN, the switch acquires the VLAN ID for the address from the ports that you select on the forwarding map. A static address in one VLAN must be a static address in other VLANs. A packet with a static address that arrives on a VLAN where it has not been statically entered is flooded to all ports and not learned.

Perform this task to add a static address.

SUMMARY STEPS

1.    enable

2.    configure terminal

3.    mac-address-table static hw-addr [interface] interface-id [vlan] vlan-id

4.    end


DETAILED STEPS
  Command or Action Purpose
Step 1
enable


Example:

Router> enable

 

Enables privileged EXEC mode.

  • Enter your password if prompted.
 
Step 2
configure terminal


Example:

Router# configure terminal

 

Enters global configuration mode.

 
Step 3
mac-address-table static hw-addr [interface] interface-id [vlan] vlan-id

Example:

Router(config)# mac-address-table static 0100.5e05.0505 interface 0/3/1 vlan vlan 1

 

Enters the static MAC address, the interface, and the VLAN ID of those ports.

 
Step 4
end


Example:

Router(config)# end

 

Returns to privileged EXEC mode.

 

Removing a Static Address

Follow these steps to remove a static address.

SUMMARY STEPS

1.    enable

2.    configure terminal

3.    no mac-address-table static hw-addr [interface] interface-id [vlan] vlan-id

4.    end


DETAILED STEPS
  Command or Action Purpose
Step 1
enable


Example:

Router> enable

 

Enables privileged EXEC mode.

  • Enter your password if prompted.
 
Step 2
configure terminal


Example:

Router# configure terminal

 

Enters global configuration mode.

 
Step 3
no mac-address-table static hw-addr [interface] interface-id [vlan] vlan-id

Example:

Router(config)# no mac-address-table static 0100.5e05.0505 interface 0/3/1 vlan vlan

 

Enters the static MAC address, the interface, and the VLAN ID of the port to be removed.

 
Step 4
end


Example:

Router(config)# end

 

Returns to privileged EXEC mode.

 

Clearing All MAC Address Tables

Perform this task to remove all MAC address tables.

SUMMARY STEPS

1.    enable

2.    clear mac-address-table

3.    end


DETAILED STEPS
  Command or Action Purpose
Step 1
enable


Example:

Router> enable

 

Enables privileged EXEC mode.

  • Enter your password if prompted.
 
Step 2
clear mac-address-table


Example:

Router# clear mac-address-table

 

Clears all MAC address tables.

 
Step 3
end


Example:

Router# end

 

Exits privileged EXEC mode.

 

Configuration Examples for EtherSwitch HWICs

Range of Interface Examples

  • Single Range Configuration: Example, page 92
  • Range Macro Definition: Example, page 92

Example: Single Range Configuration

The following example shows all Fast Ethernet interfaces on an HWIC-4ESW in slot 2 being reenabled:

Router(config)# interface range fastethernet 0/3/0 - 8
Router(config-if-range)# no shutdown
Router(config-if-range)#
*Mar  21 14:01:21.474: %LINK-3-UPDOWN: Interface FastEthernet0/3/0, changed state to up
*Mar  21 14:01:21.490: %LINK-3-UPDOWN: Interface FastEthernet0/3/1, changed state to up
*Mar  21 14:01:21.502: %LINK-3-UPDOWN: Interface FastEthernet0/3/2, changed state to up
*Mar  21 14:01:21.518: %LINK-3-UPDOWN: Interface FastEthernet0/3/3, changed state to up
*Mar  21 14:01:21.534: %LINK-3-UPDOWN: Interface FastEthernet0/3/4, changed state to up
*Mar  21 14:01:21.546: %LINK-3-UPDOWN: Interface FastEthernet0/3/5, changed state to up
*Mar  21 14:01:21.562: %LINK-3-UPDOWN: Interface FastEthernet0/3/6, changed state to up
*Mar  21 14:01:21.574: %LINK-3-UPDOWN: Interface FastEthernet0/3/7, changed state to up
*Mar  21 14:01:21.590: %LINK-3-UPDOWN: Interface FastEthernet0/3/8, changed state to up
Router(config-if-range)#

Example: Range Macro Definition

The following example shows how to define an interface-range macro named enet_list to select Fast Ethernet interfaces 0/1/0 through 0/1/3:

Router(config)# define interface-range enet_list fastethernet 0/1/0 - 0/1/3Router(config)#

The following example shows how to define an interface-range configuration mode using the interface-range macro enet_list:

Router(config)# interface
 range
 macro
 enet
_list
 

Optional Interface Feature Examples

  • Interface Speed: Example, page 93
  • Setting the Interface Duplex Mode: Example, page 93
  • Adding a Description for an Interface: Example, page 93

Example: Interface Speed

The following example shows how to set the interface speed to 100 Mbps on Fast Ethernet interface 0/3/7:

Router(config)# interface fastethernet 0/3/7
Router(config-if)# speed 100

Example: Setting the Interface Duplex Mode

The following example shows how to set the interface duplex mode to full on Fast Ethernet interface 0/3/7:

Router(config)# interface fastethernet 0/3/7
Router(config-if)# duplex full

Example: Adding a Description for an Interface

The following example shows how to add a description of Fast Ethernet interface 0/3/7:

Router(config)# interface fastethernet 0/3/7
Router(config-if)# description Link to root switch

Example: Stacking

The following example shows how to stack two HWICs.

Router(config)# interface FastEthernet 0/1/8
Router(config-if)# no shutdown
Router(config-if)# switchport stacking-partner interface FastEthernet 0/3/8
Router(config-if)# interface FastEthernet 0/3/8
Router(config-if)# no shutdown

Note


In practice, the command switchport stacking-partner interface FastEthernet 0/partner-slot/partner-port needs to be executed for only one of the stacked ports. The other port will be automatically configured as a stacking port by the Cisco IOS software. The command no shutdown, however, must be executed for both of the stacked ports.

Example: VLAN Configuration

The following example shows how to configure inter-VLAN routing:

Router> enable
Router# configure terminal
Router(config)# vlan 45
Router(config-vlan)# vlan 1
Router(config-vlan)# vlan 2
Router(config-vlan)# exit
Router# configure terminal
Router(config)# interface vlan 1
Router(config-if)# ip address 10.1.1.1 255.255.255.0
Router(config-if)# no shut
Router(config-if)# interface vlan 2
Router(config-if)# ip address 10.2.2.2 255.255.255.0
Router(config-if)# no shut
Router(config-if)# interface FastEthernet 0/1/0
Router(config-if)# switchport access vlan 1
Router(config-if)# interface Fast Ethernet 0/1/1
Router(config-if)# switchport access vlan 2
Router(config-if)# exit

Example: VLAN Trunking Using VTP

The following example shows how to configure the switch as a VTP server:

Router# vlan database
Router(vlan)# vtp server
Setting device to VTP SERVER mode.
Router(vlan)# vtp domain Lab
_Network
Setting VTP domain name to Lab_Network
Router(vlan)# vtp password WATER
Setting device VLAN database password to WATER.
Router(vlan)# exit
APPLY completed.
Exiting....
Router# 

The following example shows how to configure the switch as a VTP client:

Router# vlan database
Router(vlan)# vtp client
Setting device to VTP CLIENT mode.
Router(vlan)# exit
In CLIENT state, no apply attempted.
Exiting....
Router# 

The following example shows how to configure the switch as VTP transparent:

Router# vlan database
Router(vlan)# vtp transparent
Setting device to VTP TRANSPARENT mode.
Router(vlan)# exit
APPLY completed.
Exiting....
Router# 

Spanning Tree Examples

  • Spanning-Tree Interface and Spanning-Tree Port Priority: Example, page 95
  • Spanning-Tree Port Cost: Example, page 95
  • Bridge Priority of a VLAN: Example, page 96
  • Hello Time: Example, page 96
  • Forward-Delay Time for a VLAN: Example, page 96
  • Maximum Aging Time for a VLAN: Example, page 96
  • Spanning Tree: Examples, page 96
  • Spanning Tree Root: Example, page 97

Example: Spanning-Tree Interface and Spanning-Tree Port Priority

The following example shows how to configure VLAN port priority of an interface :

Router# configure terminal
 
Router(config)# interface fastethernet 0/3
/2
Router(config-if)# spanning
-
tree vlan 20 port
-priority 64
 
Router(config-if)# end
 
Router#

The following example shows how to verify the configuration of VLAN 200 on the interface when it is configured as a trunk port:

Router# show spanning
-
tree vlan 20
 VLAN20 is executing the ieee compatible Spanning Tree protocol
  Bridge Identifier has priority 32768, address 00ff.ff90.3f54
  Configured hello time 2, max age 20, forward delay 15
  Current root has priority 32768, address 00ff.ff10.37b7
  Root port is 33 (FastEthernet0/3/2), cost of root path is 19
  Topology change flag not set, detected flag not set
  Number of topology flags 0 last change occurred 00:05:50 ago
  Times: hold 1, topology change 35, notification 2
     hello 2, max age 20, forward delay 15
  Timers: hello 0, topology change 0, notification 0, aging 0
 Port 33 (FastEthernet0/3/2) of VLAN20 is forwarding
  Port path cost 18, Port priority 64, Port Identifier 64.33
  Designated root has priority 32768, address 00ff.ff10.37b7
  Designated bridge has priority 32768, address 00ff.ff10.37b7
  Designated port id is 128.13, designated path cost 0
  Timers: message age 2, forward delay 0, hold 0
  Number of transitions to forwarding state: 1
  BPDU: sent 1, received 175
Router#

Example: Spanning-Tree Port Cost

The following example shows how to change the spanning-tree port cost of a Fast Ethernet interface:

Router# configure terminal
 
Router(config)# interface fastethernet 
0/3/2
Router(config-if)# spanning
-
tree cost 18 
Router(config-if)# end
 
Router#
Router# show run interface fastethernet0/3/2
Building configuration...
Current configuration: 140 bytes
!
interface FastEthernet0/3/2
 switchport access vlan 20
  no ip address
  spanning-tree vlan 20 port-priority 64
  spanning-tree cost 18
end

The following example shows how to verify the configuration of the interface when it is configured as an access port:

Router# show spanning
-
tree interface fastethernet 0/3
/2
 Port 33 (FastEthernet0/3/2) of VLAN20 is forwarding
  Port path cost 18, Port priority 64, Port Identifier 64.33
  Designated root has priority 32768, address 00ff.ff10.37b7
  Designated bridge has priority 32768, address 00ff.ff10.37b7
  Designated port id is 128.13, designated path cost 0
  Timers: message age 2, forward delay 0, hold 0
  Number of transitions to forwarding state: 1
  BPDU: sent 1, received 175
Router#

Example: Bridge Priority of a VLAN

The following example shows the bridge priority of VLAN 20 being configured to 33792:

Router# configure terminal 
Router(config)# spanning tree vlan 20 priority 33792
Router(config)# end
 

Example: Hello Time

The following example shows the hello time for VLAN 20 being configured to 7 seconds:

Router# configure terminal
Router(config)# spanning-tree vlan 20 hello-time 7
Router(config)# end

Example: Forward-Delay Time for a VLAN

The following example shows how to configure the forward delay time for to 21 seconds on VLAN 20:

Router# configure terminal
Router(config)# spanning-tree vlan 20 forward-time 21
Router(config)# end

Example: Maximum Aging Time for a VLAN

The following example shows how to configure the maximum aging time for VLAN 20 to 36 seconds:

Router# configure terminal
Router(config)# spanning-tree vlan 20 max-age 36
Router(config)# end

Example: Spanning Tree

The following example shows how to enable spanning tree on VLAN 20:

Router# configure terminal 
Router(config)# spanning
-
tree
 vlan
 20
 
Router(config)# end
 
Router#

Note


Because spanning tree is enabled by default, issuing a show running command to view the resulting configuration will not display the command you entered to enable spanning tree.

The following example shows spanning tree being disabled on VLAN 20:

Router# configure
 terminal
 
Router(config)# no
 spanning
-tree
 vlan
 20
 
Router(config)# end
 
Router#

Example: Spanning Tree Root

The following example shows the switch being configured as the root bridge for VLAN 10, with a network diameter of 4:

Router# configure terminal
 
Router(config)# spanning-tree vlan 10 root primary diameter 4
 
Router(config)# exit

Example: MAC Table Manipulation

The following example shows how to configure a static entry in the MAC address table:

Router(config)# mac-address-table static beef.beef.beef interface fastethernet 0/1/5
Router(config)# end

The following example shows how to configure the port security in the MAC address table.

Router(config)# mac-address-table secure 0000.1111.2222 fastethernet 0/1/2 vlan 3
Router(config)# end

Switched Port Analyzer (SPAN) Source Examples

  • SPAN Source Configuration: Example, page 97
  • SPAN Destination Configuration: Example, page 98
  • Removing Sources or Destinations from a SPAN Session: Example, page 98

Example: SPAN Source Configuration

The following example shows how to configure the SPAN session 1 to monitor bidirectional traffic from source interface Fast Ethernet 0/1/1:

Router(config)# monitor session 1 source interface fastethernet 0/1/1

Example: SPAN Destination Configuration

The following example shows how to configure Fast Ethernet 0/3/7 interface as the destination for SPAN session 1:

Router(config)# monitor session 1 destination interface fastethernet 0/3/7

Example: Removing Sources or Destinations from a SPAN Session

This following example shows interface Fast Ethernet 0/3/2 being removed as a SPAN source for SPAN session 1:

Router(config)# no monitor session 1 source interface fastethernet 0/3/2

Example: IGMP Snooping

The following example shows the output from configuring IGMP snooping:

Router# show mac-address-table multicast igmp-snooping 
HWIC Slot: 1 
-------------- 
    MACADDR     VLANID     INTERFACES 
0100.5e05.0505    1        Fa0/1/1
0100.5e06.0606    2
HWIC Slot: 3 
-------------- 
    MACADDR     VLANID     INTERFACES 
0100.5e05.0505    1        Fa0/3/4
0100.5e06.0606    2        Fa0/3/0
Router# 

The following is an example of output from the show running interface privileged EXEC command for VLAN 1:

Router# 
show running interface vlan 1 
Building configuration... 
Current configuration :82 bytes 
! 
interface Vlan1 
 ip address 192.168.4.90 255.255.255.0 
 ip pim sparse-mode 
end 
Router# 
show running interface vlan 2
 
Building configuration... 
Current configuration :82 bytes 
! 
interface Vlan2 
 ip address 192.168.5.90 255.255.255.0 
 ip pim sparse-mode 
end 
Router# 
Router# show ip igmp group 
IGMP Connected Group Membership 
Group Address    Interface                Uptime    Expires   Last Reporter 
209.165.200.225 Vlan1                    01:06:40  00:02:20  192.168.41.101 
209.165.200.226 Vlan2                    01:07:50  00:02:17  192.168.5.90 
209.165.200.227 Vlan1                    01:06:37  00:02:25  192.168.41.100 
209.165.200.228 Vlan2                    01:07:40  00:02:21  192.168.31.100 
209.165.200.229 Vlan1                    01:06:36  00:02:22  192.168.41.101 
209.165.200.230 Vlan2                    01:06:39  00:02:20  192.168.31.101 
Router# 
Router# show ip mroute 
IP Multicast Routing Table 
Flags:D - Dense, S - Sparse, B - Bidir Group, s - SSM Group, C - 
Connected, 
       L - Local, P - Pruned, R - RP-bit set, F - Register flag, 
       T - SPT-bit set, J - Join SPT, M - MSDP created entry, 
       X - Proxy Join Timer Running, A - Candidate for MSDP Advertisement, 
       U - URD, I - Received Source Specific Host Report 
Outgoing interface flags:H - Hardware switched 
Timers:Uptime/Expires 
Interface state:Interface, Next-Hop or VCD, State/Mode 
(*, 209.165.200.230), 01:06:43/00:02:17, RP 0.0.0.0, flags:DC 
  Incoming interface:Null, RPF nbr 0.0.0.0 
  Outgoing interface list: 
    Vlan1, Forward/Sparse, 01:06:43/00:02:17 
(*, 209.165.200.226), 01:12:42/00:00:00, RP 0.0.0.0, flags:DCL 
  Incoming interface:Null, RPF nbr 0.0.0.0 
  Outgoing interface list: 
    Vlan2, Forward/Sparse, 01:07:53/00:02:14 
(*, 209.165.200.227), 01:07:43/00:02:22, RP 0.0.0.0, flags:DC 
  Incoming interface:Null, RPF nbr 0.0.0.0 
  Outgoing interface list: 
    Vlan1, Forward/Sparse, 01:06:40/00:02:22 
    Vlan2, Forward/Sparse, 01:07:44/00:02:17 

(*, 209.165.200.2282), 01:06:43/00:02:18, RP 0.0.0.0, flags:DC

  Incoming interface:Null, RPF nbr 0.0.0.0 
  Outgoing interface list: 
    Vlan1, Forward/Sparse, 01:06:40/00:02:18 
    Vlan2, Forward/Sparse, 01:06:43/00:02:16 
Router# 

Example: Storm-Control

The following example shows how to enable bandwidth-based multicast suppression at 70 percent on Fast Ethernet interface 2:

Router# configure terminal
Router(config)# interface FastEthernet0/3/3
Router(config-if)# storm-control multicast threshold 70.0 30.0
Router(config-if)# end
Router# show storm-control multicast
Interface  Filter State  Upper    Lower    Current
---------  ------------  -----    -----    -------
Fa0/1/0    inactive      100.00%  100.00%  N/A
Fa0/1/1    inactive      100.00%  100.00%  N/A
Fa0/1/2    inactive      100.00%  100.00%  N/A
Fa0/1/3    inactive      100.00%  100.00%  N/A
Fa0/3/0    inactive      100.00%  100.00%  N/A
Fa0/3/1    inactive      100.00%  100.00%  N/A
Fa0/3/2    inactive      100.00%  100.00%  N/A
Fa0/3/3    Forwarding     70.00%   30.00%  0.00%
Fa0/3/4    inactive      100.00%  100.00%  N/A
Fa0/3/5    inactive      100.00%  100.00%  N/A
Fa0/3/6    inactive      100.00%  100.00%  N/A
Fa0/3/7    inactive      100.00%  100.00%  N/A
Fa0/3/8    inactive      100.00%  100.00%  N/A

Ethernet Switching Examples

  • Subnets for Voice and Data: Example, page 100
  • Inter-VLAN Routing: Example, page 101
  • Single Subnet Configuration: Example, page 101
  • Ethernet Ports on IP Phones with Multiple Ports: Example, page 101

Example: Subnets for Voice and Data

The following example shows how to configure separate subnets for voice and data on the EtherSwitch HWIC:

interface FastEthernet0/1/1
 description DOT1Q port to IP Phone
 switchport native vlan 50
 switchport mode trunk
 switchport voice vlan 150
interface Vlan 150
description voice vlan
ip address 
209.165.200.227
 255.255.255.0
ip helper-address 
209.165.200.228
 (See Note below)
interface Vlan 50
description data vlan
ip address 
209.165.200.220
 255.255.255.0

This configuration instructs the IP phone to generate a packet with an 802.1Q VLAN ID of 150 that has 802.1p value of 5 (default for voice bearer traffic).


Note


In a centralized CallManager deployment model, the DHCP server might be located across the WAN link. If so, an ip helper-address command pointing to the DHCP server should be included on the voice VLAN interface for the IP phone. This is done to obtain its IP address as well as the address of the TFTP server required for its configuration.

Be aware that IOS supports a DHCP server function. If this function is used, the EtherSwitch HWIC serves as a local DHCP server and a helper address would not be required.

Example: Inter-VLAN Routing

Configuring inter-VLAN routing is identical to the configuration on an EtherSwitch HWIC with an MSFC. Configuring an interface for WAN routing is consistent with other IOS platforms.

The following example provides a sample configuration:

interface Vlan 160
 description voice vlan
 ip address 10.6.1.1 255.255.255.0
interface Vlan 60
 description data vlan
 ip address 10.60.1.1 255.255.255.0
interface Serial0/3/0
 ip address 172.3.1.2 255.255.255.0

Note


Standard IGP routing protocols such as RIP, IGRP, EIGRP, and OSPF are supported on the EtherSwitch HWIC. Multicast routing is also supported for PIM dense mode, sparse mode and sparse-dense mode.

Single Subnet Configuration Example

The EtherSwitch HWIC supports the use of an 802.1p-only option when configuring the voice VLAN. Using this option allows the IP phone to tag VoIP packets with a Cost of Service of 5 on the native VLAN, while all PC data traffic is sent untagged

The following example shows a single subnet configuration for the EtherSwitch HWIC:

Router# FastEthernet 0/1/2
description Port to IP Phone in single subnet
 switchport access vlan 40

The EtherSwitch HWIC instructs the IP phone to generate an 802.1Q frame with a null VLAN ID value but with an 802.1p value (default is COS of 5 for bearer traffic). The voice and data VLANs are both 40 in this example.

Example: Ethernet Ports on IP Phones with Multiple Ports

The following example illustrates the configuration for the IP phone:

interface FastEthernet0/x/x
 switchport voice vlan x
 switchport mode trunk

The following example illustrates the configuration for the PC:

interface FastEthernet0/x/y
 switchport mode access
 switchport access vlan y

Note


Using a separate subnet, and possibly a separate IP address space, may not be an option for some small branch offices due to the IP routing configuration. If the IP routing can handle an additional subnet at the remote branch, you can use Cisco Network Registrar and secondary addressing.

Additional References

The following sections provide references related to EtherSwitch HWICs.

Related Documents

Related Topic

Document Title

IP LAN switching commands: complete command syntax, command mode, defaults, usage guidelines, and examples

Cisco IOS LAN Switching Services Command Reference

Bridge-related commands; complete command syntax, command mode, defaults, usage guidelines, and examples

Cisco IOS Bridge Command Reference

Information about configuring Voice over IP features

Cisco IOS Voice Configuration Library

Voice over IP commands

Cisco IOS Voice Command Reference

Information about configuring IP routing

Cisco IOS IP Routing: Protocol-Independent Configuration Guide for the Cisco IOS Release you are using

Information about intrachassis stacking configuration

16- and 36-Port Ethernet Switch Module for Cisco 2600 Series, Cisco 3600 Series, and Cisco 3700 Series module

VLAN concepts

"VLANs" section of the EtherSwitch Network Module

Inline power for Cisco IP phones concepts

"Inline Power for Cisco IP Phones" section of the EtherSwitch Network Module

Layer 2 Ethernet switching concepts

"Layer 2 Ethernet Switching" section of the EtherSwitch Network Module

802.1x authentication concepts

"802.1x Authentication" section of the EtherSwitch Network Module

Spanning tree protocol concepts

"Using the Spanning Tree Protocol with the EtherSwitch Network Module" section of the EtherSwitch Network Module

Cisco Discovery Protocol concepts

"Cisco Discovery Protocol" section of the EtherSwitch Network Module

Switch port analyzer concepts

"Switched Port Analyzer" section of the EtherSwitch Network Module

IGMP snooping concepts

IGMP Snooping" section of the EtherSwitch Network Module

Storm control concepts

"Storm Control" section of the EtherSwitch Network Module

Intrachassis stacking concepts

'Intrachassis Stacking" section of the EtherSwitch Network Module

Fallback bridging concepts

"Fallback Bridging" section of the EtherSwitch Network Module

Standards

Standards

Title

No new or modified standards are supported by this feature, and support for existing standards have not been modified by this feature.

--

MIBs

MIBs

MIBs Link

No new or modified MIBs are supported by this feature, and support for existing MIBs has not been modified by this feature.

To locate and download MIBs for selected platforms, Cisco IOS releases, and feature sets, use Cisco MIB Locator found at the following URL:

http://www.cisco.com/go/mibs

RFCs

RFCs

Title

No new or modified RFCs are supported by this feature, and support for existing standards has not been modified by this feature.

--

Technical Assistance

Description

Link

The Cisco Support website provides extensive online resources, including documentation and tools for troubleshooting and resolving technical issues with Cisco products and technologies.

To receive security and technical information about your products, you can subscribe to various services, such as the Product Alert Tool (accessed from Field Notices), the Cisco Technical Services Newsletter, and Really Simple Syndication (RSS) Feeds.

Access to most tools on the Cisco Support website requires a Cisco.com user ID and password.

http://www.cisco.com/cisco/web/support/index.html

Feature Information for the Cisco HWIC-4ESW and the Cisco HWIC-D-9ESW EtherSwitch Cards

The following table provides release information about the feature or features described in this module. This table lists only the software release that introduced support for a given feature in a given software release train. Unless noted otherwise, subsequent releases of that software release train also support that feature.

Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to www.cisco.com/go/cfn. An account on Cisco.com is not required.

Table 5 Feature Information for the 4-Port Cisco HWIC-4ESW and the 9-Port Cisco HWIC-D-9ESW EtherSwitch High Speed WAN Interface Cards

Feature Name

Releases

Feature Information

4-port Cisco HWIC-4ESW and the 9-port Cisco HWIC-D-9ESW EtherSwitch high speed WAN interface cards (HWICs) hardware feature

12.3(8)T4

The 4-port Cisco HWIC-4ESW and the 9-port Cisco HWIC-D-9ESW EtherSwitch high speed WAN interface cards (HWICs) hardware feature is supported on Cisco 1800 (modular), Cisco 2800, and Cisco 3800 series integrated services routers.

Cisco EtherSwitch HWICs are 10/100BASE-T Layer 2 Ethernet switches with Layer 3 routing capability. (Layer 3 routing is forwarded to the host and is not actually performed at the switch.) Traffic between different VLANs on a switch is routed through the router platform. Any one port on a Cisco EtherSwitch HWIC may be configured as a stacking port to link to another Cisco EtherSwitch HWIC or EtherSwitch network module in the same system. An optional power module can also be added to provide inline power for IP telephones. The HWIC-D-9ESW HWIC requires a double-wide card slot.

Cisco and the Cisco logo are trademarks or registered trademarks of Cisco and/or its affiliates in the U.S. and other countries. To view a list of Cisco trademarks, go to this URL: www.cisco.com/go/trademarks. Third-party trademarks mentioned are the property of their respective owners. The use of the word partner does not imply a partnership relationship between Cisco and any other company. (1110R)

Any Internet Protocol (IP) addresses and phone numbers used in this document are not intended to be actual addresses and phone numbers. Any examples, command display output, network topology diagrams, and other figures included in the document are shown for illustrative purposes only. Any use of actual IP addresses or phone numbers in illustrative content is unintentional and coincidental.

© 2011 Cisco Systems, Inc. All rights reserved.