Cisco IOS Interface Configuration Guide, Release 12.2 - Configuring LAN Interfaces [Cisco IOS Software Releases 12.2 Mainline]

Table Of Contents

Configuring LAN Interfaces

Configuring Ethernet, Fast Ethernet, or Gigabit Ethernet Interfaces

Ethernet, Fast Ethernet and Gigabit Ethernet Interface Configuration Task List

Specifying an Ethernet, Fast Ethernet, or Gigabit Ethernet Interface

Specifying an Ethernet Encapsulation Method

Specifying Full-Duplex Operation

Specifying the Media and Connector Type

Extending the 10BASE-T Capability

Configuring Fast Ethernet 100BASE-T

Configuring PA-12E/2FE Port Adapters

Configuring the 100VG-AnyLAN Port Adapter

Configuring the Cisco 7200-I/O-GE+E and Cisco 7200-I/O-2FE/E Input/Output Controllers

Cisco 7200-I/O-GE+E and Cisco 7200-I/O-2FE/E Configuration Task List

Configuring the Interface Transmission Mode

Configuring Interface Speed

Configuring the Ethernet, Fast Ethernet, and Gigabit Ethernet Interfaces

Verifying the Configuration

Monitoring and Maintaining the Cisco 7200-I/O GE+E and Cisco 7200-I/O-2FE/E

Configuring Fast EtherChannel

Fast EtherChannel Configuration Task List

Configuring the Port-Channel Interface

Configuring the Fast Ethernet Interfaces

Configuring an FDDI Interface

Source-Route Bridging over FDDI on Cisco 4000-M, Cisco 4500-M, and Cisco 4700-M Routers

Particle-Based Switching of Source-Route Bridge Packets on Cisco 7200 Series Routers

Using Connection Management Information

FDDI Configuration Task List

Specifying an FDDI

Enabling FDDI Bridging Encapsulation

Enabling Full-Duplex Mode on the FDDI

Setting the Token Rotation Time

Setting the Transmission Valid Timer

Controlling the Transmission Timer

Modifying the C-Min Timer

Modifying the TB-Min Timer

Modifying the FDDI Timeout Timer

Controlling SMT Frame Processing

Enabling Duplicate Address Checking

Setting the Bit Control

Controlling the CMT Microcode

Starting and Stopping FDDI

Setting FDDI Frames Per Token Limit

Controlling the FDDI SMT Message Queue Size

Preallocating Buffers for Bursty FDDI Traffic

Configuring a Hub Interface

Enabling a Hub Port

Disabling or Enabling Automatic Receiver Polarity Reversal

Disabling or Enabling the Link Test Function

Enabling Source Address Control

Enabling SNMP Illegal Address Trap

Configuring a LAN Extender Interface

Connecting a LAN Extender to a Core Router

Expanded View of the Connection to a Core Router

Management of the LAN Extender Interface

Installing a LAN Extender at a Remote Site

Discovering the MAC Address

Upgrading Software for the LAN Extender

Configuring the LAN Extender

LAN Extender Interface Configuration Task List

Configuring and Creating a LAN Extender Interface

Defining Packet Filters

Controlling Priority Queueing

Controlling the Sending of Commands to the LAN Extender

Shutting Down and Restarting the Ethernet Interface of the LAN Extender

Restarting the LAN Extender

Downloading a Software Image to the LAN Extender

Troubleshooting the LAN Extender

Configuring a Token Ring Interface

Particle-Based Switching of Source-Route Bridge Packets on Cisco 7200 Series Routers

Dedicated Token Ring Port Adapter

Token Ring Interface Configuration Task List

Specifying a Token Ring Interface

Enabling Early Token Release

Configuring PCbus Token Ring Interface Management

Enabling Token Ring Concentrator Port

Monitoring and Maintaining the Port

LAN Interface Configuration Examples

Ethernet Encapsulation Enablement Example

Full-Duplex Enablement Operation Example

PA-12E/2FE Port Configuration Examples

PA-VG100 Port Adapter Configuration Example

Cisco 7200-I/O-GE+E and Cisco 7200-I/O-2FE/E Configuration Examples

Configuring the Gigabit Ethernet Interface on the Cisco 7200-I/O-GE+E

Configuring Autonegotiation on the Cisco 7200-I/O-2FE/E

Fast EtherChannel Configuration Examples

FDDI Frames Configuration Example

Hub Configuration Examples

Hub Port Startup Examples

Source Address for an Ethernet Hub Port Configuration Examples

Hub Port Shutdown Examples

SNMP Illegal Address Trap Enablement for Hub Port Example

LAN Extender Enablement Interface Example

LAN Extender Interface Access List Examples

MAC Address Filtering Example

Ethernet Type Code Filtering Example

Configuring LAN Interfaces

Use the information in this chapter to configure LAN interfaces supported on Cisco routers and access servers.

To identify the hardware platform or software image information associated with a feature, use the Feature Navigator on Cisco.com to search for information about the feature or refer to the software release notes for a specific release. For more information, see the Identifying Supported Platforms in "Using Cisco IOS Software."

This chapter describes the processes for configuring LAN interfaces in the following sections:

•Configuring Ethernet, Fast Ethernet, or Gigabit Ethernet Interfaces

•Configuring the Cisco 7200-I/O-GE+E and Cisco 7200-I/O-2FE/E Input/Output Controllers

•Configuring Fast EtherChannel

•Configuring an FDDI Interface

•Configuring a Hub Interface

•Configuring a LAN Extender Interface

•Configuring a Token Ring Interface

For examples of configuration tasks, see the "LAN Interface Configuration Examples" section.

For hardware technical descriptions and information about installing interfaces, refer to the hardware installation and configuration publication for your product. For a complete description of the LAN interface commands used in this chapter, refer to the "Interface Commands" chapter of the Cisco IOS Interface Command Reference. To locate documentation of other commands that appear in this chapter, use the command reference master index or search online.

Configuring Ethernet, Fast Ethernet, or Gigabit Ethernet Interfaces

Cisco supports 10-Mbps Ethernet, 100-Mbps Fast Ethernet, and 1000-Mbps Gigabit Ethernet.

Support for the 10-Mbps, 100-Mbps, and 1000-Mbps Ethernet interface is supplied on various Ethernet network interface cards or systems.

Fast Ethernet NP-1FE Module Benefits:

•VLAN routing—VLAN support enables network managers to group users logically rather than by physical location. The high performance of the underlying Cisco 4700, combined with the feature-rich NP-1FE, makes it an ideal combination for a low-density, higher-performance application such as inter-VLAN routing.

•High-speed interconnections—The Fast Ethernet interface enables network managers to implement Fast-Ethernet routing solutions for optimal cost and performance across a wide range of applications, including campus or enterprise backbones and data centers. It is also a low-cost way to provide Fast-Ethernet access to traditional low-speed WAN services.

•Local area network aggregation—The Cisco 4500 or the Cisco 4700 series routers can support as many as 12 Ethernet, 4 Token Ring, or 1 FDDI segment. ISDN interfaces are also supported.

With the Catalyst 3000 or Catalyst 5000 system, the Fast Ethernet processor can be used to aggregate up to twelve 10-Mbps LANs and give them high-speed access to such Layer 3 routing services as providing firewalls and maintaining access lists.

Cisco 7200 Series Routers with FastEthernet and Gigabit Ethernet

Cisco 7200 series routers support an I/O controller with an RJ-45 interface for Fast Ethernet support and an I/O controller with both RJ-45 and GBIC interfaces for Gigabit Ethernet support.

The Cisco 7200-I/O-GE+E is an Input/Output controller that provides one Gigabit Ethernet and one Ethernet port. It is equipped with a GBIC receptacle for 1000 Mbps operation and an RJ-45 receptacle for 10-Mbps operation.

The Cisco 7200-I/O-2FE/E is an I/O controller that provides two autosensing Fast Ethernet ports and is equipped with two RJ-45 receptacles for 10/100 Mbps operation.

You can configure the Fast Ethernet port for use at 100-Mbps full-duplex or half-duplex operation (half duplex is the default). The Fast Ethernet port is equipped with either a single MII receptacle or an MII receptacle and an RJ-45 receptacle. To support this new feature, the media-type interface command has been modified. The media-type command now supports two options:

•100BASE-X—Specifies an RJ-45 100BASE-X physical connection.

•mii—Specifies a media-independent interface.

The Gigabit Ethernet interface on the Cisco 7200-I/O-GE+E operates at full duplex and cannot be configured for half-duplex mode.

Second-generation Fast Ethernet Interface Processors (FEIP2-DSW-2TX and FEIP2-DSW-2FX) are available on Cisco 7500 series routers and on Cisco 7000 series routers with the 7000 Series Route Switch Processor (RSP7000) and 7000 Series Chassis Interface (RSP7000CI). The FEIP2-DSW is a dual-port, fixed-configuration interface processor that provides two 100-Mbps Fast Ethernet (FE) interfaces. Each interface on the FEIP2-DSW supports both half-duplex and full-duplex.

Refer to the Cisco Product Catalog for specific platform and hardware compatibility information.

Use the show interfaces, show controllers mci, and show controllers cbus EXEC commands to display the Ethernet port numbers. These commands provide a report for each interface supported by the router or access server.

Use the show interfaces fastethernet command to display interface statistics, and use the show controllers fastethernet to display information about the Fast Ethernet controller chip. The output shows statistics, including information about initialization block information, transmit ring, receive ring, and errors.

Use the show interfaces gigabitethernet command to display interface statistics, and use the show controllers gigabitethernet to display the information about the Gigabit Ethernet controller chip. The output shows statistics, including information about initialization block information, transmit ring, receive ring, and errors.

For information on how to configure Fast EtherChannel, see the tasks listed in the "Configuring Fast EtherChannel" section.

Ethernet, Fast Ethernet and Gigabit Ethernet Interface Configuration Task List

To configure features on an Ethernet or Fast Ethernet interface, perform the tasks in the following sections:

•Specifying an Ethernet, Fast Ethernet, or Gigabit Ethernet Interface (Required)

•Specifying an Ethernet Encapsulation Method (Optional)

•Specifying Full-Duplex Operation (Optional)

•Specifying the Media and Connector Type (Optional)

•Extending the 10BASE-T Capability (Optional)

•Configuring Fast Ethernet 100BASE-T (Optional)

•Configuring PA-12E/2FE Port Adapters (Optional)

•Configuring the 100VG-AnyLAN Port Adapter (Optional)

Specifying an Ethernet, Fast Ethernet, or Gigabit Ethernet Interface

To specify an Ethernet interface and enter interface configuration mode, use one of the following commands in global configuration mode:

Command

Purpose

Router(config)# interface ethernet number

Enters interface configuration mode.

Router(config)# interface ethernet slot/port

Enters interface configuration mode for the Cisco 7200 and Cisco 7500 series routers.

Router(config)# interface ethernet slot/port-adapter/port

Enters interface configuration mode for Cisco 7500 series routers.

Router(config)# interface fastethernet number

Enters interface configuration mode for the Cisco 4000 series with a Fast Ethernet NIM installed.

Router(config)# interface fastethernet slot/port

Specifies a Fast Ethernet interface and enters interface configuration mode on the Cisco 7200 series routers.

Router(config)# interface gigabitethernet slot/port

Specifies a Gigabit Ethernet interface and enters interface configuration mode on the Cisco 7200 series routers.

Router(config)# interface fastethernet slot/port-adapter/port

Specifies a Fast Ethernet interface and enters interface configuration mode on the Cisco 7500 series routers.

To display the Fast Ethernet slots and ports, use the show interfaces fastethernet command. The Fast Ethernet network interface module (NIM) and the Fast Ethernet Interface Processor (FEIP) default to half-duplex mode.

Specifying an Ethernet Encapsulation Method

Currently, there are three common Ethernet encapsulation methods:

•The standard Advanced Research Projects Agency (ARPA) Ethernet Version 2.0 encapsulation, which uses a 16-bit protocol type code (the default encapsulation method).

•Service access point (SAP) IEEE 802.3 encapsulation, in which the type code becomes the frame length for the IEEE 802.2 LLC encapsulation (destination and source Service Access Points, and a control byte).

•The SNAP method, as specified in RFC 1042, Standard for the Transmission of IP Datagrams Over IEEE 802 Networks, which allows Ethernet protocols to run on IEEE 802.2 media.

The encapsulation method that you use depends upon the routing protocol that you are using, the type of Ethernet media connected to the router or access server, and the routing or bridging application that you configure.

To establish Ethernet encapsulation of IP packets, use one of the following commands in interface configuration mode:

Command

Purpose

Router(config-if)# encapsulation arpa

Selects ARPA Ethernet encapsulation.

Router(config-if)# encapsulation sap

Selects SAP Ethernet encapsulation.

Router(config-if)# encapsulation snap

Selects SNAP Ethernet encapsulation.

For an example of selecting Ethernet encapsulation for IP, see the "Ethernet Encapsulation Enablement Example" section.

Specifying Full-Duplex Operation

The default is half-duplex mode on the FEIP2-DSW-2FX. To enable full-duplex mode on the FEIP2-DSW-2FX (for a maximum aggregate bandwidth of 200 Mbps), use either of the following commands in interface configuration mode:
Command

Purpose
Router(config-if)# full-duplex
or

Router(config-if)# no half-duplex
Enables full-duplex on the Fast Ethernet interface of the FEIP2-DSW-2FX.
For an example of enabling full-duplex mode on Fast Ethernet, see the "Full-Duplex Enablement Operation Example" section.

Caution To prevent system problems, do not configure both FEIP2-DSW-2FX interfaces for full-duplex operation at the same time.

The FEIP2-DSW-2TX supports half-duplex only and should not be configured for full-duplex.

Specifying the Media and Connector Type

You can specify that the Ethernet network interface module (NIM) on the Cisco 4000 series routers use either the default of an attachment unit interface (AUI) and a 15-pin connector, or 10BASE-T and an RJ-45 connector. To do so, use one of the following commands in interface configuration mode:

Command

Purpose

Router(config-if)# media-type aui

Selects a 15-pin Ethernet connector.

Router(config-if)# media-type 10baset

Selects an RJ-45 Ethernet connector.

The default media connector type is an RJ-45 or SC (fiber-optic) connector. You can specify that the interface uses either an MII connector, or an RJ-45 or SC (fiber-optic) connector (this is the default). To do so, use one of the following commands in interface configuration mode:

Command

Purpose

Router(config-if)# media-type mii

Selects an MII Ethernet connector.

Router(config-if)# media-type 100basex

Selects an RJ-45 Ethernet connector for the FEIP2-DSW-2TX or an SC connector for the FEIP2-DSW-2FX.

Note When using the I/O controller that is equipped with an MII receptacle and an RJ-45 receptacle, only one receptacle can be configured for use at a time.

Extending the 10BASE-T Capability

On a Cisco 4000 series or Cisco 4500 series routers, you can extend the twisted-pair 10BASE-T capability beyond the standard 100 meters by reducing the squelch (signal cutoff time). This feature applies only to the LANCE controller 10BASE-T interfaces. LANCE is the AMD controller chip for the Cisco 4000 and Cisco 4500 Ethernet interface and does not apply to the Fast Ethernet interface.

To reduce squelch, use the first command in the following table in interface configuration mode. You can later restore the squelch by using the second command.

Command

Purpose

Router(config-if)# squelch reduced

Reduces the squelch.

Router(config-if)# squelch normal

Returns squelch to normal.

Configuring Fast Ethernet 100BASE-T

You must configure the Fast Ethernet 100BASE-T interface on a Cisco AS5300 so that it can be recognized as a device on the Ethernet LAN. The Fast Ethernet interface supports 10- and 100-Mbps speeds with the 10BASE-T and 100BASE-T routers, hubs, and switches.

To configure the interface, use the following commands beginning in privileged EXEC mode:

Command

Purpose

Step 1

Router# configure terminal

Enters global configuration mode.

Step 2

Router(config)# interface fastethernet number

Enters Fast Ethernet interface configuration mode.

Step 3

Router(config-if)# ip address address subnet-mask

Assigns an IP address and subnet mask to the interface.

Step 4

Router(config-if)# speed {10 | 100 | auto}

Assigns a speed to the interface. The default is 100 Mbps.¹

For relationship between duplex and speed command options, see Table 4.

Step 5

Router(config-if)# duplex {full | half | auto}

Sets up the duplex configuration on the Fast Ethernet interface. The default is half duplex.1

For relationship between duplex and speed command options, see Table 4.

¹The auto option automatically negotiates the speed on the basis of the speed and the peer router, hub, or switch media.

To use the autonegotiation capability (that is, to detect speed and duplex modes automatically), you must set both speed and duplex command to auto. Setting the speed command to auto negotiates speed only, and setting duplex command to auto negotiates duplex only. Table 4 describes the performance of the access server for different combinations of the duplex and speed command options. The specified duplex command option plus the specified speed command option produces the resulting system action.
Table 4 Relationship Between duplex and speed Command Options
duplex Command

speed Command

Resulting System Actions

Router(config-if)# duplex auto

speed auto

Autonegotiates both speed and duplex modes.

Router(config-if)# duplex auto

speed 10 or speed 100

Autonegotiates both speed and duplex modes.
Router(config-if)# duplex half
or

Router(config-if)# duplex full
speed auto

Autonegotiates both speed and duplex modes.
Router(config-if)# duplex half

speed 10

Forces 10 Mbps and half duplex.

Router(config-if)# duplex full

speed 10

Forces 10 Mbps and full duplex.

Router(config-if)# duplex half

speed 100

Forces 100 Mbps and half duplex.

Router(config-if)# duplex full

speed 100

Forces 100 Mbps and full duplex.
Configuring PA-12E/2FE Port Adapters

The PA-12E/2FE Ethernet switch port adapter provides Cisco 7200 series routers with up to twelve 10-Mbps and two 10/100-Mbps switched Ethernet (10BASE-T) and Fast Ethernet (100BASE-TX) interfaces for an aggregate bandwidth of 435 Mbps, full-duplex. The PA-12E/2FE port adapter supports the Ethernet, IEEE 802.3, and IEEE 802.3u specifications for 10-Mbps and 100-Mbps transmission over unshielded twisted pair (UTP) cables.

The PA-12E/2FE port adapter offloads Layer 2 switching from the host CPU by using store-and-forward or cut-through switching technology between interfaces within the same virtual LAN (VLAN) on the PA-12E/2FE port adapter. The PA-12E/2FE port adapter supports up to four VLANs (bridge groups).

Note The PA-12E/2FE port adapter is a dual-width port adapter, which means it occupies two horizontally aligned port adapter slots when installed in a Cisco 7200 series router. (Single-width port adapters occupy individual port adapter slots in a Cisco 7200 series router.)

All interfaces on the PA-12E/2FE port adapter support autosensing and autonegotiation of the proper transmission mode (half-duplex or full-duplex) with an attached device. The first two PA-12E/2FE interfaces (port 0 and port 1) also support autosensing and autonegotiation of the proper connection speed (10 Mbps or 100 Mbps) with an attached device. If an attached device does not support autosensing and autonegotiation of the proper transmission mode, the PA-12E/2FE interfaces attached to the device automatically enter half-duplex mode. Use the show system:running-config command to determine if a PA-12E/2FE interface is autosensing and autonegotiating the proper transmission mode with an attached device. Use the full-duplex and the half-duplex commands to change the transmission mode of a PA-12E/2FE interface. After changing the transmission mode, use the show interfaces command to verify the transmission mode of the interface.

Note If you use the full-duplex and the half-duplex commands to change the transmission mode of the first two PA-12E/2FE interfaces (port 0 and port 1), the transmission speed of the two PA-12E/2FE interfaces automatically defaults to 100-Mbps. The first two PA-12E/2FE interfaces operate only at 10 Mbps when the interfaces are autosensing and autonegotiating the proper connection speed (10 Mbps or 100 Mbps) with an attached device.

To configure the PA-12E/2FE port adapter, perform the tasks in the following sections. Each task in the list is identified as either required or optional.

•Configuring the PA-12E/2FE Port Adapter (Required)

•Monitoring and Maintaining the PA-12E/2FE Port Adapter (Optional)

•Configuring Bridge Groups Using the 12E/2FE VLAN Configuration WebTool (Optional)

Note If you plan to use a PA-12E/2FE interface to boot from a network (using TFTP), ensure that the interface is configured for a loop-free environment, that an IP address is configured for the interface's bridge-group virtual interface, and system boot image 11.2(10)P is installed on your router (use the show version command to view the system boot image of your router). Then, before booting from the network server, use the bridge-group bridge-group number spanning-disabled command to disable the Spanning Tree Protocol configured on the interface to keep the TFTP server from timing out and closing the session.

For detailed information about booting from a network using TFTP, loading a system image from a network server, and configuring the Spanning Tree Protocol on your Cisco 7200 series router, refer to the PA-12E/2FE Ethernet Switch Port Adapter book that accompanies the hardware and to the Cisco IOS Bridging and IBM Networking Configuration Guide.

For information on other commands that can be used to configure a PA-12E/2FE port adapter, refer to the Cisco IOS Interface Command Reference. For information on bridging, refer to the "Configuring Transparent Bridging" chapter in the Cisco IOS Bridging and IBM Networking Configuration Guide.

For PA-12E/2FE port adapter configuration examples, see the "PA-12E/2FE Port Configuration Examples" section.

Configuring the PA-12E/2FE Port Adapter

This section provides instructions for a basic configuration. You might also need to enter other configuration commands depending on the requirements for your system configuration and the protocols that you plan to route on the interface. For complete descriptions of configuration commands and the configuration options available, refer to the other configuration guides and command references in the Cisco IOS documentation set.

To configure the interfaces on the PA-12E/2FE port adapter, use the following commands beginning in global configuration mode:
Command

Purpose

Step 1

Router(config)# bridge bridge-group protocol ieee

Specifies the type of Spanning Tree Protocol.

The PA-12E/2FE port adapter supports DEC and IEEE Spanning Tree Protocols; however, we recommend using the IEEE protocol when configuring bridge groups.

Step 2

Router(config)# interface fastethernet slot/port
(ports 0 and 1)

Router(config)# interface ethernet slot/port
(ports 2 through 13)

Enters interface configuration mode for the interface you want to configure.

Step 3

Router(config-if)# bridge-group bridge-group

Assigns a bridge group to the interface.

Step 4

Router(config-if)# cut-through [receive | transmit]

(Optional) Configures the interface for cut-through switching technology. The default is store-and-forward (that is, no cut-through).

Step 5

Router(config-if)# full-duplex

(Optional) Configures the transmission mode for full-duplex, if an attached device does not support autosensing or autonegotiation. The default is half-duplex.

Step 6

Router(config-if)# no shutdown

Restarts the interface.

Step 7

Router(config-if)# exit

Returns to global configuration mode.
Step 8
Repeat Steps 1 through 7 for each interface.
Step 9

Router# copy system:running-config nvram:startup-config

Saves the new configuration to memory.
To enable integrated routing and bridging on the bridge groups, use the following commands beginning in global configuration mode:
Command

Purpose

Step 1

Router(config)# bridge irb

Enables integrated routing and bridging.

Step 2

Router(config)# interface bvi bridge-group

Enables a virtual interface on a bridge group.

Step 3

Router(config-if)# ip address ip-address mask

Assigns an IP address and subnet mask to the bridge-group virtual interface.

Step 4

Router(config-if)# no shutdown

Restarts the interface.

Step 5

Router(config-if)# exit

Returns to global configuration mode.
Step 6
Repeat Steps 1 through 5 for each bridge group.
Step 7

Router(config)# bridge bridge-group route protocol

Specifies the protocol for each bridge group.

Step 8

Router(config)# exit

Exits global configuration mode.

Step 9

Router# copy system:running-config nvram:startup-config

Saves the new configuration to memory.
Monitoring and Maintaining the PA-12E/2FE Port Adapter

After configuring the new interface, you can display its status and verify other information. To display information about the PA-12E/2FE port adapter, use the following commands in EXEC mode:
Command

Purpose

Router# show version

Displays the configuration of the system hardware, the software version, the names and sources of configuration files, and the boot image.

Router# show controllers

Displays all current port adapters and their interfaces
Router# show interfaces fastethernet slot/port
(ports 0 and 1)
or

Router# show interfaces ethernet slot/port
(ports 2 through 13)
Displays the interfaces so that you can verify that they have the correct slot number and that the interface and line protocol are in the correct state.
Router# show bridge group

Displays all bridge groups and their interfaces.
Router# show interfaces fastethernet slot/port irb
(ports 0 and 1)
or

Router# show interfaces ethernet slot/port irb
(ports 2 through 13)
Displays the routed protocol so you can verify that it is configured correctly for each interface.
Router# show protocols

Displays the protocols configured for the entire system and specific interfaces.
Router# show pas eswitch addresses fastethernet slot/port
(ports 0 and 1)
or

Router# show pas eswitch addresses ethernet slot/port
(ports 2 through 13)
Displays the Layer 2 learned addresses for each interface.
Router# more system:running-config

Displays the running configuration file.

Router# more nvram:startup-config

Displays the configuration stored in NVRAM.
Configuring Bridge Groups Using the 12E/2FE VLAN Configuration WebTool

The 12E/2FE VLAN Configuration WebTool, shown in Figure 3, is a web browser-based Java applet that displays configured interfaces and bridge groups for PA-12E/2FE port adapters installed in Cisco routers. With the WebTool you can perform the following tasks:

•Create and delete bridge groups (also referred to as VLANs)

•Add and remove PA-12E/2FE interfaces from bridge groups

•Assign colors to bridge groups and PA-12E/2FE interfaces

•Administratively shut down (disable) and bring up (enable) PA-12E/2FE interfaces

•View the bridge-group status of each PA-12E/2FE interface

You can access the 12E/2FE VLAN Configuration WebTool from the home page of your router. For complete procedures on how to use the VLAN Configuration WebTool, refer to the PA-12E/2FE Ethernet Switch Port Adapter book that accompanies the hardware.

Figure 3 Example Home Page for a Cisco 7200 Series Router (Cisco 7206 Shown)

All Cisco routers that run Cisco IOS Release 11.0 or later have a home page. All Cisco router home pages are password protected. Contact your network administrator if you do not have the name or password for your Cisco 7200 series router.

If your router has an installed PA-12E/2FE port adapter, the 12E/2FE VLAN Configuration WebTool shown in Figure 3 can be accessed from the home page of the router using a Java-enabled web browser.

Configuring the 100VG-AnyLAN Port Adapter

The 100VG-AnyLAN port adapter (PA-100VG) is available on Cisco 7200 series routers and on Cisco 7500 series routers.

The PA-100VG provides a single interface compatible with and specified by IEEE 802.12 to support 100 Mbps over Category 3 or Category 5 UTP cable with RJ-45 terminators. The PA-100VG supports 802.3 Ethernet packets and can be monitored with the IEEE 802.12 Interface MIB.

To configure the PA-100VG port adapter, use the following commands beginning in global configuration mode:
Command

Purpose
Step 1
Router(config)# interface vg-anylan slot/port
(Cisco 7200)
or

Router(config)# interface vg-anylan slot/port-adapter/port
(Cisco 7500)
Specifies a 100VG-AnyLAN interface and enters interface configuration.
Step 2

Router(config-if)# ip address ip-address mask

Specifies the IP address and subnet mask to the interface.

Step 3

Router(config-if)# frame-type ethernet

Configures the frame type. Currently, only Ethernet frames are supported. The frame type defaults to Ethernet.
Note The port number for the 100VG-AnyLAN port adapter is always 0.

Configuring the PA-100VG interface is similar to configuring an Ethernet or Fast Ethernet interface. To display information about the 100VG-AnyLAN port adapter, use the show interfaces vg-anylan EXEC command.

Configuring the Cisco 7200-I/O-GE+E and Cisco 7200-I/O-2FE/E Input/Output Controllers

The Cisco 7200-I/O-GE+E is an Input/Output controller that provides one Gigabit Ethernet and one Ethernet port. It is equipped with a GBIC receptacle for 1000-Mbps operation and an RJ-45 receptacle for 10-Mbps operation.

The Cisco 7200-I/O-2FE/E is an Input/Output controller that provides two autosensing Fast Ethernet ports and is equipped with two RJ-45 receptacles for 10/100-Mbps operation.

I/O controllers support the following features:

•Dual EIA/TIA-232 channels for local console and auxiliary ports

•NVRAM for storing the system configuration and environmental monitoring logs

•Two PC Card slots that hold Flash disks or Flash memory cards for storing the default Cisco IOS software image

•Flash memory for storing the boot helper image

•Two environmental sensors for monitoring the cooling air as it enters and leaves the chassis

Cisco 7200-I/O-GE+E and Cisco 7200-I/O-2FE/E Configuration Task List

See the following sections for configuration tasks for the Cisco 7200-I/O-GE+E and the Cisco 7200-I/O-2FE/E feature. Each task in the list is identified as required or optional.

•Configuring the Interface Transmission Mode (Optional)

•Configuring Interface Speed (Optional)

•Configuring the Ethernet, Fast Ethernet, and Gigabit Ethernet Interfaces (Required)

•Verifying the Configuration (Optional)

•Monitoring and Maintaining the Cisco 7200-I/O GE+E and Cisco 7200-I/O-2FE/E (optional)

Note For Cisco 7200 VXR routers used as router shelves in AS5800 Universal Access Servers, use the router-shelf/slot/port command format for all interface commands.

Configuring the Interface Transmission Mode

To configure the interface transmission mode, use the following commands beginning in privileged EXEC mode. The Fast Ethernet and Ethernet interfaces on the Cisco 7200-I/O-2FE/E are duplex auto by default.
Command

Purpose
Step 1
Router# configure terminal
Enters global configuration mode and specifies that the console terminal is the source of the configuration subcommands.
Step 2
Router(config)# interface fastethernet 0/0¹
Selects the Fast Ethernet interface to configure.
Step 3
Router(config)# duplex full
Changes the Fast Ethernet interface port transmission mode to full duplex from autonegotiation.
¹Use the interface fastethernet router-shelf/slot/port command for a Cisco 7200 VXR used as a router shelf in an AS5800 Universal Access Server.
Configuring Interface Speed

To configure the two autosensing Ethernet/Fast Ethernet interfaces on the C7200-I/O-2FE/E, use the speed command. The the default interface speed is auto. The following procedure configures the C7200-I/O-2FE/E for a speed of 10 Mbps:
Command

Purpose
Step 1
Router# configure terminal
Enters global configuration mode and specifies that the console terminal is the source of the configuration subcommands.
Step 2
Router(Config)# interface ethernet 0/1¹
Selects the Ethernet interface to configure.
Router(Config-if)# interface fastethernet 0/0²
Selects the Fast Ethernet interface to configure.
Step 3
Router(Config-if)# speed 10
Sets the Ethernet or FastEthernet interface speed to 10 Mbps.
¹Use the interface ethernet router-shelf/slot/port command for a Cisco 7200 VXR used as a router shelf in an AS5800 Universal Access Server.

²Use the interface fastethernet router-shelf/slot/port command for a Cisco 7200 VXR used as a router shelf in an AS5800 Universal Access Server.
Configuring the Ethernet, Fast Ethernet, and Gigabit Ethernet Interfaces

The following procedure explains a basic configuration for an Ethernet, Fast Ethernet, or Gigabit Ethernet interface on a C7200-I/O-GE+E or a C7200-I/O-2FE/E.
Command

Purpose
Step 1
Router# configure terminal
Enters global configuration mode and specifies that the console terminal is the source of the configuration subcommands.
Step 2
Router(config)# interface ethernet 0/1¹
Selects the Ethernet interface on the I/O controller in slot 0 in port adapter slot 1 to configure.
Router(config)# interface fastethernet 0/1²
Selects the Fast Ethernet interface on the I/O controller in slot 0 in port adapter slot 2 to configure.
Router(config)# interface gigabitethernet 0/0³
Selects the Gigabit Ethernet interface on the I/O controller in slot 0 in port adapter slot 0 to configure.
Step 3
Router(config-if) # ip address 10.1.1.10 
255.255.255.0
Assigns an IP address and subnet mask to the interface (if IP routing is enabled on the system).
Step 4
Router(config-if)# duplex auto
Changes the Fast Ethernet interface port transmission mode to autonegotiation.
Step 5
Router#(config-if)# Ctrl-Z
Exits configuration mode.
¹Use the interface ethernet router-shelf/slot/port command for a Cisco 7200 VXR used as a router shelf in an AS5800 Universal Access Server.

²Use the interface fastethernet router-shelf/slot/port command for a Cisco 7200 VXR used as a router shelf in an AS5800 Universal Access Server.

³Use the interface gigabitethernet router-shelf/slot/port command for a Cisco 7200 VXR used as a router shelf in an AS5800 Universal Access Server.
Verifying the Configuration

Use the show interfaces {ethernet | fastethernet | gigabitethernet} command to verify that the interface and line protocol are in the correct state (up) and that the transmission mode is configured on the interface. You can configure full, half, or auto transmission mode for Ethernet and Fast Ethernet interfaces. You can configure forced transmission mode for Gigabit Ethernet interfaces. The following is sample output from the show interfaces gigabitethernet command.
Router# show interfaces gigabitethernet 0/0
GigabitEthernet0/0 is up, line protocol is up 
   Hardware is 82543 (Livengood), address is 00d0.ffb6.4c00 (bia 00d0.ffb6.4c00)
   Internet address is 10.1.1.0/0
   MTU 1500 bytes, BW 1000000 Kbit, DLY 10 usec, 
      reliability 255/255, txload 1/255, rxload 1/255
   Encapsulation ARPA, loopback not set
   Keepalive set (10 sec)
   Full-duplex mode, link type is autonegotiation, media type is SX
   output flow-control is on, input flow-control is on
   ARP type:ARPA, ARP Timeout 04:00:00
   Last input 00:00:04, output 00:00:03, output hang never
   Last clearing of "show interface" counters never
   Queueing strategy:fifo
   Output queue 0/40, 0 drops; input queue 0/75, 0 drops
   5 minute input rate 0 bits/sec, 0 packets/sec
   5 minute output rate 0 bits/sec, 0 packets/sec
      2252 packets input, 135120 bytes, 0 no buffer
      Received 2252 broadcasts, 0 runts, 0 giants, 0 throttles
      0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
      0 watchdog, 0 multicast, 0 pause input
      0 input packets with dribble condition detected
      2631 packets output, 268395 bytes, 0 underruns
      0 output errors, 0 collisions, 2 interface resets
      0 babbles, 0 late collision, 0 deferred
      0 lost carrier, 0 no carrier, 0 pause output
      0 output buffer failures, 0 output buffers swapped out
Monitoring and Maintaining the Cisco 7200-I/O GE+E and Cisco 7200-I/O-2FE/E

To monitor and maintain the Gigabit Ethernet or Ethernet interfaces on the Cisco 7200-I/O-GE+E, use the following commands in privileged EXEC mode:
Command

Purpose
Router# show controllers ethernet
Displays hardware and software information about the Ethernet interface.
Router# show interfaces ethernet slot/port¹
Displays information about the Ethernet interface on the router.
Router# show controllers gigabitethernet
Displays hardware and software information about the Gigabit Ethernet interface.
Router# show interfaces gigabitethernet slot/port²
Displays information about a Gigabit Ethernet interface on the router.
¹Use the show interfaces ethernet router-shelf/slot/port command for a Cisco 7200 VXR used as a router shelf in an AS5800 Universal Access Server

²Use the interface gigabitethernet router-shelf/slot/port command for a Cisco 7200 VXR used as a router shelf in an AS5800 Universal Access Server.
To monitor and maintain the Fast Ethernet or Ethernet interfaces on the Cisco 7200-I/O-2FE/E, use the following commands in privileged EXEC mode:
Command

Purpose
Router# show controllers ethernet
Displays hardware and software information about the Ethernet interface.
Router# show interfaces ethernet slot/port¹
Displays information about an Ethernet interface on the router.
Router# show controllers fastethernet
Displays hardware and software information about the Fast Ethernet interfaces.
Router# show interfaces fastethernet
Displays information about a Fast Ethernet interface on the router.
¹Use the show interfaces ethernet router-shelf/slot/port command for a Cisco 7200 VXR used as a router shelf in an AS5800 Universal Access Server.
Configuring Fast EtherChannel

The Fast EtherChannel feature allows multiple Fast Ethernet point-to-point links to be bundled into one logical link to provide bidirectional bandwidth of up to 800 Mbps. Fast EtherChannel builds on standards-based 802.3 full-duplex Fast Ethernet to provide fault-tolerant, high-speed links between switches, routers, and servers. This feature can be configured between Cisco 7200 series routers, Cisco 7500 series routers, and Cisco 7000 series routers with the 7000 Series Route Switch Processor (RSP7000) and 7000 Series Chassis Interface (RSP7000CI) or between a Cisco 7500 series router or a Cisco 7000 series router with the RSP7000 and RSP7000CI and a Catalyst 5000 switch.

Note Using the Fast EtherChannel feature on a Catalyst 5000 switch requires a hardware upgrade. Contact your local sales representative for upgrade details.

Fast EtherChannel provides higher bidirectional bandwidth, redundancy, and load sharing. Up to four Fast Ethernet interfaces can be bundled in a port channel, and the router or switch can support up to four port channels. The Fast EtherChannel feature is capable of load balancing traffic across the Fast Ethernet links. Unicast, broadcast, and multicast traffic is distributed across the links providing higher performance and redundant parallel paths. In the event of a link failure, traffic is redirected to remaining links within the Fast EtherChannel without user intervention.

Fast EtherChannel feature, IP traffic is distributed over the port channel interface while traffic from other routing protocols is sent over a single link. Bridged traffic is distributed on the basis of the Layer 3 information in the packet. If the Layer 3 information does not exist in the packet, the traffic is sent over the first link.

Fast EtherChannel supports all features currently supported on the Fast Ethernet interface. You must configure these features on the port-channel interface rather than on the individual Fast Ethernet interfaces. Fast EtherChannel connections are fully compatible with Cisco IOS VLAN and routing technologies. The Inter-Switch Link (ISL) VLAN trunking protocol can carry multiple VLANs across a Fast EtherChannel, and routers attached to Fast EtherChannel links can provide full multiprotocol routing with support for host standby using Hot Standby Router Protocol (HSRP).

The port channel (consisting of up to four Fast Ethernet interfaces) is treated as a single interface. A port channel is used in the Cisco IOS software to maintain compatibility with existing commands on the Catalyst 5000 switch. You create the Fast EtherChannel by using the interface port-channel interface configuration command. You can assign up to four Fast Ethernet interfaces to a port channel by using the channel-group interface configuration command.

Additional Fast EtherChannel features include

•Hot Standby Router Protocol (HSRP)

For more information about configuring HSRP, refer to the "Configuring IP Services" chapter in the Cisco IOS IP Configuration Guide.

•Cisco Express Forwarding (CEF) and distributed CEF (dCEF)

For more information about configuring CEF, refer to the "Cisco Express Forwarding" chapter in the Cisco IOS Switching Services Configuration Guide.

For information on how to configure Ethernet or Fast Ethernet, see the tasks listed in the , section.

Fast EtherChannel Configuration Task List

To configure Fast EtherChannel, perform the tasks in the following sections. Each task is identified as required or optional.

•Configuring the Port-Channel Interface

•Configuring the Fast Ethernet Interfaces.

For information on other configuration tasks for the Fast EtherChannel, see the , section.

For information on other commands that can be used by the Fast EtherChannel, refer to the other configuration guides and command references in the Cisco IOS documentation set.

Configuring the Port-Channel Interface

To configure the port-channel interface, use the following commands beginning in global configuration mode:

Command

Purpose

Step 1

Router(config)# interface port-channel channel-number

Creates the port-channel interface and enters interface configuration mode. The channel number can be 1 to 4.

Step 2

Router(config-if)# ip address ip-address mask

Assigns an IP address and subnet mask to the Fast EtherChannel.

If you configure ISL, you must assign the IP address to the subinterface (for example, interface port channel 1.1—an IP address per VLAN) and you must specify the encapsulation with VLAN number under that subinterface (for example, encapsulation isl 100).

Step 3

Router(config-if)# mac-address ieee-address

(Optional) Assigns a static MAC address to the Fast EtherChannel.

If you do not assign a static MAC address on the port-channel interface, the Cisco IOS software automatically assigns a MAC address. If you assign a static MAC address and then later remove it, the Cisco IOS software automatically assigns a MAC address.

Step 4

Router(config-if)# end

(Optional) Enables other supported interface commands to execute, and exits when they have finished.

Step 5

Router# show interface port-channel

Displays information about the port-channel interface so that you can verify the configuration.

Note If you want to use the Cisco Discovery Protocol (CDP), you must configure it on the physical Ethernet, Fast Ethernet, or GigabitEthernet interface, not on the port-channel interface.

Caution With Release 11.1(20)CC and later, Fast EtherChannel supports CEF/dCEF. We recommend that you clear all explicit ip route-cache distributed commands from the Fast Ethernet interfaces before enabling dCEF on the port-channel interface. Doing this gives the port-channel interface proper control of its physical Fast Ethernet links. When you enable CEF/dCEF globally, all interfaces that support CEF/dCEF are enabled. When CEF/dCEF is enabled on the port-channel interface, it is automatically enabled on each of the Fast Ethernet interfaces in the channel group. However, if you have previously disabled CEF/dCEF on the Fast Ethernet interface, CEF/dCEF is not automatically enabled. In this case, you must enable CEF/dCEF on the Fast Ethernet interface.

Configuring the Fast Ethernet Interfaces

To assign the Fast Ethernet interfaces to the Fast EtherChannel, use the following commands beginning in global configuration mode:

Command

Purpose

Step 1

Router(config)# interface fastethernet slot/port
(Cisco 7200 series routers)

Router(config)# interface fastethernet slot/port-adapter/port
(Cisco 7500 series and Cisco 7000 series routers with RSP7000)

Creates or modifies an existing Fast Ethernet interface and enters interface configuration mode.

Step 2

Router(config-if)# no ip address

Disables the IP address before performing the next step, if the Fast Ethernet interface already exists and has an IP address assigned.

Step 3

Router(config-if)# channel-group channel-number

Assigns the Fast Ethernet interfaces to the Fast EtherChannel. The channel number is the same as the channel number that you specified when you created the port-channel interface.

Step 4

Router(config-if)# exit

Exits interface configuration mode. Repeat Steps 1 through 4 to add up to four Fast Ethernet interfaces to the Fast EtherChannel.

Step 5

Router(config-if)# end

(Optional) Enables other supported interface commands to execute, and exits when they have finished.

Step 6

Router(config)# show interfaces port-channel

Displays information about the Fast Ethernet interface so that you can verify the configuration.