Configuring Linecard Expansion Modules

This chapter contains the following sections:

Configuring Breakout

Information About Linecard Expansion Modules

The Linecard Expansion Module (LEM) is a field replaceable module. LEM is supported only on the Cisco Nexus 5696Q Series model. There are 8 LEM slots on the device and each LEM slot has 12 to 40 Gigabit Ethernet ports that can break out into 48 to 10 Gigabit Ethernet ports per LEM. The module can be either in 10 Gigabit Ethernet mode or in a 40 Gigabit Ethernet mode. A power-off followed by a power-on of the module is required to change the mode. The Cisco Nexus 5696Q Series model also supports a 100 Gigabit Ethernet LEM, but the 100 Gigabit Ethernet LEM does not support the Breakout feature.

Configuring Breakout in a Port

Procedure

  Command or Action Purpose

Step 1

switch# configure terminal

Enters global configuration mode.

Step 2

switch(config)# interface breakout slot slot port port-range map 10g-4x

Configures the breakout feature in a port.

slot —Slot number of port depending on the chassis model. Valid values are from 1 to 8.

port-range —Single port or range of ports on which breakout is configured. Valid values are from 1 to 48.

Note

 

On the Cisco Nexus 56128 Switch, you can configure group of two ports. For example, 49-50, 51-52, or 25-26.

On the Cisco Nexus 5672UP Switch, you can configure group of three ports. For example, 1-3, or 4-6.

On the Cisco Nexus 5624Q Switch, you can configure group of three ports beginning with 1-3, 4-6, 7-9, and 10-12. You cannot enter a port-range of 2-4 or 8-10.

Step 3

switch(config)# poweroff module module-number

Power-off and power-on the module for the interface breakout to be effective. If the breakout feature is configured on the baseboard module, save the running configuration to startup configuration using the copy running-config startup-config command and then reload the switch.

Note

 

If the breakout feature is not configured on the baseboard module, then an additional reload is required.

Step 4

switch(config)# no poweroff module module-number

Brings the module up.

Step 5

switch(config)# copy running-config startup-config

Saves the change persistently through reboots and restarts by copying the running configuration to the startup configuration.

Example

This example shows how to configure a breakout on the Cisco Nexus 5600 Series Switch in a 10 Gigabit Ethernet mode of operation. 

switch# configure terminal
switch(config)# interface breakout slot 1 port 1-48 map 10g-4x
switch(config)# poweroff module 1
switch(config)# no poweroff module 1
switch(config)# copy running-config startup-config

Removing the Breakout Configuration

Procedure

  Command or Action Purpose

Step 1

switch# configure terminal

Enters global configuration mode.

Step 2

switch(config)# no interface breakout slot slot port port-range map 10g-4x

Removes the breakout configurations for a port module and returns the interface to 40 Gigabit Ethernet mode of operation.

slot —Slot number of the module depending on the chassis model. Valid values are from 1 to 8.

Note

 

Enter the same slot module value that you used for the corresponding port while configuring the Breakout feature.

port-range —Single port or range of ports.

Note

 

Enter the same port-range value that you used for the corresponding port while configuring the breakout feature.

Step 3

switch(config)# poweroff module module-number

Power-off and power-on the module for the interface breakout to be effective. If the breakout feature is configured on baseboard module, save the running configuration to startup configuration using the copy running-config startup-config command and then reload the switch.

Note

 

If the breakout feature is not configured on the baseboard module, then an additional reload is required.

Step 4

switch(config)# no poweroff module module-number

Brings the module up.

Step 5

switch(config)# copy running-config startup-config

Saves the change persistently through reboots and restarts by copying the running configuration to the startup configuration.

Example

This example shows how to remove the breakout configuration in a port and return to the 40 Gigabit Ethernet mode of operation on the Cisco Nexus 5600 Series Switch. 

switch# configure terminal
switch(config)# no interface breakout slot 1 port 1-48 map 10g-4x
switch(config)# poweroff module 1
switch(config)# no poweroff module 1
switch(config)# copy running-config startup-config

Verifying a Breakout Configuration

Use the following commands to verify a breakout configuration. You can use the commands in any order.

Command

Purpose

show interface eth1/2 capabilities

Displays information about the interface configuration.

show interface brief

Displays a brief summary of the interface configuration.