Cisco Nexus 5000 Series Switch CLI Software Configuration Guide - Configuring Ethernet Interfaces [Cisco Nexus 5000 Series Switches]

Table Of Contents

Configuring Ethernet Interfaces

Information About Ethernet Interfaces

About the Interface Command

About the Debounce Timer Parameters

About MTU Configuration

Configuring Ethernet Interfaces

Configuring the CDP Parameter

Configuring the Debounce Timer

Additional Ethernet Configuration

Configuring the Description Parameter

Disabling and Restarting Ethernet Interfaces

Displaying Interface Information

Default Physical Ethernet Settings

Configuring Ethernet Interfaces

This section describes the configuration of the Ethernet interfaces on the Cisco Nexus 5000 Series switches. It includes the following sections:

•Information About Ethernet Interfaces

•Configuring Ethernet Interfaces

•Additional Ethernet Configuration

•Displaying Interface Information

Information About Ethernet Interfaces

The Ethernet ports can operate as standard Ethernet interfaces connected to servers or to a LAN.

The Ethernet interfaces also support Fibre Channel over Ethernet (FCoE). FCoE allows the physical Ethernet link to carry both Ethernet and Fibre Channel traffic. For additional information, see Chapter 28, "Configuring FCoE" and Chapter 29, "Configuring Virtual Interfaces."

On the Cisco Nexus 5000 Series switch, the Ethernet interfaces are enabled by default.

This section includes the following topics:

•About the Interface Command

•About the Debounce Timer Parameters

•About MTU Configuration

About the Interface Command

You can enable the various capabilities of the Ethernet interfaces on a per-interface basis using the interface command. When you enter the interface command, you specify the following information:

•Interface type—All physical Ethernet interfaces use the ethernet keyword.

•Slot number

–Slot 1 includes all the fixed ports.

–Slot 2 includes the ports on the upper expansion module (if populated).

–Slot 3 includes the ports on the lower expansion module (if populated),

•Port number

–Port number within the group.

About the Debounce Timer Parameters

The port debounce time is the amount of time that an interface waits to notify the supervisor of a link going down. During this time, the interface waits to see if the link comes back up. The wait period is a time when traffic is stopped.

You can enable the debounce timer for each interface and specify the delay time in milliseconds.

Caution When you enable the port debounce timer the link up and link down detections are delayed, resulting in a loss of traffic during the debounce period. This situation might affect the convergence and reconvergence of some protocols.

About MTU Configuration

A per-physical Ethernet interface maximum transmission unit (MTU) is not supported. Instead, MTU is set according to the QoS classes. You modify MTU by setting Policy and Class maps. See Chapter 30, "Configuring QoS" for more details.

When you show the interface settings, an MTU of 1500 is displayed for physical Ethernet interfaces and a receive data field size of 2112 is displayed for Fibre Channel interfaces.

Configuring Ethernet Interfaces

This section shows how to configure Ethernet interfaces. It includes the following topics:

•Configuring the CDP Parameter

•Configuring the Debounce Timer

Configuring the CDP Parameter

You can enable or disable the Cisco Discovery Protocol (CDP) for Ethernet interfaces. This protocol works only when you have it enabled on both interfaces on the same link.

To enable or disable CDP for an interface, perform this task:

Command

Purpose

Step 1

switch# configure terminal

Enters configuration mode.

Step 2

switch(config)# interface type slot/port

Enters interface configuration mode for the specified interface.

Step 3

switch(config-if)# cdp {enable | disable}

Enables or disables CDP for the interface.

To work correctly, this parameter must be enabled for both interfaces on the same link.

The following example shows how to enable CDP for an Ethernet port:
switch# configure terminal 
switch(config)# interface ethernet 1/4 
switch(config-if)# cdp enable 
This command can only be applied to a physical Ethernet interface.

Configuring the Debounce Timer

You can enable the debounce timer for Ethernet ports by specifying a debounce time (in milliseconds) or disable the timer by specifying a debounce time of 0.

You can show the debounce times for all of the Ethernet ports by using the show interface debounce command.

To enable or disable the debounce timer, perform this task:

Command

Purpose

Step 1

switch# configure terminal

Enters configuration mode.

Step 2

switch(config)# interface type slot/port

Enters interface configuration mode for the specified interface.

Step 3

switch(config-if)# link debounce time milliseconds

Enables the debounce timer for the amount of time (1 to 5000 milliseconds) specified.

Disables the debounce timer if you specify 0 milliseconds.

This example shows how to enable the debounce timer and set the debounce time to 1000 milliseconds for an Ethernet interface:
switch# configure terminal 
switch(config)# interface ethernet 1/4 
switch(config-if)# link debounce time 1000 
This example shows how to disable the debounce timer for an Ethernet interface:
switch# configure terminal 
switch(config)# interface ethernet 1/4 
switch(config-if)# link debounce time 0 
This command can only be applied to a physical Ethernet interface.

Additional Ethernet Configuration

This section covers basic Ethernet configuration parameters that can be applied to a physical Ethernet port or a virtual Ethernet interface. This section includes the following topics:

•Configuring the Description Parameter

•Disabling and Restarting Ethernet Interfaces

Configuring the Description Parameter

To provide textual interface descriptions for the Ethernet ports, perform this task:
Command

Purpose
Step 1
switch# configure terminal 
Enters configuration mode.
Step 2
switch(config)# interface type slot/port 
Enters interface configuration mode for the specified interface.
Step 3
switch(config-if)# description test 
Specifies the description for the interface.
This example shows how to set the interface description to Server 3 Interface.
switch# configure terminal 
switch(config)# interface ethernet 1/3 
switch(config-if)# description Server 3 Interface 
You can also apply this command to a virtual Ethernet interface, as shown in the following example:
switch# configure terminal 
switch(config)# interface vethernet 4/1 
switch(config-if)# description Virtual Ethernet Interface
For additional information about virtual interfaces, see Chapter 28, "Configuring FCoE" and Chapter 29, "Configuring Virtual Interfaces.".

Disabling and Restarting Ethernet Interfaces

You can shut down and restart an Ethernet interface. This action disables all of the interface functions and marks the interface as being down on all monitoring displays. This information is communicated to other network servers through all dynamic routing protocols. When shut down, the interface is not included in any routing updates.

To disable an interface, perform this task:

Command

Purpose

Step 1

switch# configure terminal

Enters configuration mode.

Step 2

switch(config)# interface type slot/port

Enters interface configuration mode for the specified interface.

Step 3

switch(config-if)# shutdown

Disables the interface.

The following example shows how to disable an Ethernet port:
switch# configure terminal 
switch(config)# interface ethernet 1/4 
switch(config-if)# shutdown 
To restart an interface, perform this task:

Command

Purpose

switch(config-if)# no shutdown

Restarts the interface.

The following example shows how to disable then restart a virtual Ethernet interface:
switch# configure terminal 
switch(config)# interface vethernet 1/1 
switch(config-if)# shutdown 
switch(config-if)# no shutdown 
Displaying Interface Information

To view configuration information about the defined interfaces, perform one of these tasks:

Command

Purpose

switch# show interface type slot/port

Displays the detailed configuration of the specified interface.

switch# show interface type slot/port capabilities

Displays detailed information about the capabilities of the specified interface. This option is only available for physical interfaces

switch# show interface type slot/port transceiver

Displays detailed information about the transceiver connected to the specified interface. This option is only available for physical interfaces.

switch# show interface brief

Displays the status of all interfaces.

switch# show interface debounce

Displays the debounce status of all interfaces.

switch# show interface flowcontrol

Displays the detailed listing of the flow control settings on all interfaces.

The show interface command is invoked from EXEC mode and displays the interface configurations. Without any arguments, this command displays the information for all the configured interfaces in the switch.

The following example shows how to display the physical Ethernet interface:
switch# show interface ethernet 1/4 
Ethernet1/4 is up
    Hardware is 10000 Ethernet, address is 000d.ec8f.cb0b (bia 000d.ec8f.cb0b)
    MTU 1500 bytes, BW 10000000 Kbit, DLY 10 usec,
       reliability 255/255, txload 1/255, rxload 1/255
    Encapsulation ARPA
    Port mode is access
    full-duplex, 10000 Mb/s
    Input flow-control is off, output flow-control is off
    5 minute input rate 0 bytes/sec, 0 packets/sec
    5 minute output rate 25 bytes/sec, 0 packets/sec
    Rx
    0 Input Packets 0 Unicast Packets 0 Multicast Packets
    0 Broadcast Packets 0 Jumbo Packets 0 Storm Suppression Packets
    0 Bytes
    Tx
    688 Output Packets 688 Multicast Packets
    0 Broadcast Packets 0 Jumbo Packets
    47769 Bytes
    0 No buffer 0 runt 0 crc 0 ecc
    0 Overrun  0 Underrun 0 Ignored 0 Bad etype drop
    0 Bad proto drop 0 If down drop 0 Collision
    0 Late collision 0 Lost carrier 0 No carrier
    0 Babble
    0 Rx pause 0 Tx pause 0 Reset 
The following example shows how to display the physical Ethernet capabilities:
switch# show interface ethernet 1/3 capabilities 
Ethernet1/3
  Model:                 sfp+
  Type:                  10g
  Speed:                 10000
  Duplex:                full
  Trunk encap. type:     802.1Q
  Channel:               no
  Broadcast suppression: percentage(0-100)
  Flowcontrol:           rx-off/on/desired,tx-(off/on/desired)
  CoS rewrite:           no
  ToS rewrite:           no
  SPAN:                  yes
  UDLD:                  no
  Link Debounce:         yes
  Link Debounce Time:    yes
The following example shows how to display the physical Ethernet transceiver:
switch# show interface ethernet 1/3 transceiver 
Ethernet1/3
    sfp is present
    name is CISCO-AVAGO
    part number is SFBR-7700SDZ    B4  R
    revision is B4  R
    serial number is AGD1134229V     070823
    nominal bitrate is 0 MBits/sec
    Link length supported for 50/125mm fiber is 0 m(s)
    Link length supported for 62.5/125mm fiber is 0 m(s)
    cisco id is --
    cisco extended id number is 4 
The following example shows how to display a brief interface status (some of the output has been removed for brevity):
switch# show interface brief 
-------------------------------------------------------------------------------
Interface  Vsan   Admin  Admin   Status          SFP    Oper  Oper   Port
                  Mode   Trunk                          Mode  Speed  Channel
                         Mode                                 (Gbps)
-------------------------------------------------------------------------------
fc3/1      1      auto   on      isolated         swl    --           --
fc3/2      1      auto   on      down             swl    --           --
fc3/3      3      auto   on      up               swl    E       2    --
fc3/4      3      auto   on      sfpAbsent        --     --           --
-------------------------------------------------------------------------------
Interface                Status     IP Address        Speed    MTU   Port
                                                                     Channel
-------------------------------------------------------------------------------
Ethernet1/1              sfpIsAbsen --                --       1500  --
Ethernet1/2              sfpIsAbsen --                --       1500  --
Ethernet1/3              up         --                10000    1500  --
...
Ethernet1/35             up         --                10000    1500  --
...
Ethernet1/40             sfpIsAbsen --                --       1500  --
-------------------------------------------------------------------------------
Interface                Status     IP Address        Speed    MTU
-------------------------------------------------------------------------------
mgmt0                    up         172.16.24.47      100      1500
-------------------------------------------------------------------------------
Interface                Status     IP Address        Speed    MTU   Port
                                                                     Channel
-------------------------------------------------------------------------------
vethernet1/1             up         --                10000    1500  --
-------------------------------------------------------------------------------
Interface  Vsan   Admin  Admin   Status          SFP    Oper  Oper   Port
                  Mode   Trunk                          Mode  Speed  Channel
                         Mode                                 (Gbps)
-------------------------------------------------------------------------------
vfc1/1     1      F      --      init             --     --           -- 
The following example shows how to display the link debounce status (some of the output has been removed for brevity):
switch# show interface debounce 
--------------------------------------------------------------------------------
Port          Debounce time   Value(ms)
--------------------------------------------------------------------------------
...
Eth1/1        enable               100
Eth1/2        enable               100
Eth1/3        enable               100
...
The following example shows how to display the CDP neighbors:
switch# show cdp neighbors 
Capability Codes: R - Router, T - Trans-Bridge, B - Source-Route-Bridge
                  S - Switch, H - Host, I - IGMP, r - Repeater,
                  V - VoIP-Phone, D - Remotely-Managed-Device,
                  s - Supports-STP-Dispute
Device ID              Local Intrfce   Hldtme  Capability  Platform      Port ID
d5-switch-9.qa.          Eth1/40         148     R S I    WS-C6506-E    Ten4/2
dist-row-d               mgmt0           147     R S I    WS-C3560G-48T Gig0/34
Default Physical Ethernet Settings

The following table lists the default settings for all physical Ethernet interfaces:

Parameter

Default Setting

Debounce

Enable, 100 milliseconds

Duplex

Auto (full-duplex)

Encapsulation

ARPA

MTU¹

1500 bytes

Port Mode

Access

Speed

Auto (10000)

¹MTU cannot be changed per-physical Ethernet interface. You modify MTU by selecting maps of QoS classes. See Chapter 30, "Configuring QoS," for additional information.