Correct settings for Virtual Connect and Nexus switch

[chuckk281]

John had a customer question:

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Currently my customer is having issues with his Nexus Switch and VC, has anyone seen this problem.

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Hoa had some detailed info:

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From Cisco Nexus 7000 Series NX-OS Interfaces Configuration Guide, Release 5.x LACP Fast Timers

You can change the LACP timer rate to modify the duration of the LACP timeout. Use the lacp rate command to set the rate at which LACP control packets are sent to an LACP-supported interface. You can change the timeout rate from the default rate (30 seconds) to the fast rate (1 second). This command is supported only on LACP-enabled interfaces. To configure the LACP fast time rate, see Configuring the LACP Fast Timer Rate.

ISSU and stateful switchover cannot be guaranteed with LACP fast timers.

Configuring the LACP Fast Timer Rate

You can change the LACP timer rate to modify the duration of the LACP timeout. Use the lacp rate command to set the rate at which LACP control packets are sent to an LACP-supported interface. You can change the timeout rate from the default rate (30 seconds) to the fast rate (1 second). This command is supported only on LACP-enabled interfaces.

BEFORE YOU BEGIN

Ensure that you have enabled the LACP feature.

Ensure that you are in the correct VDC (or use the switchto vdc command).

SUMMARY STEPS

1. configure terminal

2. interface type slot/port

3. lacp rate fast

DETAILED STEPS

Command or Action

Purpose

Step 1

configure terminal

Example:

switch# configure terminal

switch(config)#

Enters configuration mode.

Step 2

interface type slot/port

Example:

switch(config)# interface ethernet 1/4

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

Step 3

lacp rate fast

Example:

switch(config-if)# lacp rate fast

Configures the fast rate (one second) at which LACP control packets are sent to an LACP-supported interface.

To reset the timeout rate to its default, use the no form of the command.

This example shows how to configure the LACP fast rate on Ethernet interface 1/4:

switch# configure terminal

switch (config)# interface ethernet 1/4

switch(config-if)# lacp rate fast

This example shows how to restore the LACP default rate (30 seconds) on Ethernet interface 1/4.

switch# configure terminal

switch (config)# interface ethernet 1/4

switch(config-if)# no lacp rate fast

Configuring the LACP System Priority

The LACP system ID is the combination of the LACP system priority value and the MAC address.

You can reuse the same configuration for the system priority values in more than one VDC.

BEFORE YOU BEGIN

Enable LACP.

Ensure that you are in the correct VDC (or use the switch tovdc command).

SUMMARY STEPS

1. configure terminal

2. lacp system-priority priority

3. show lacp system-identifier

4. copy running-config startup-config

DETAILED STEPS

Command

Purpose

Step 1

configure terminal

Example:

switch# configure terminal

switch(config)#

Enters configuration mode.

Step 2

lacp system-priority priority

Example:

switch(config)# lacp system-priority 40000

Configures the system priority for use with LACP. Valid values are from 1 through 65535, and higher numbers have a lower priority. The default value is 32768.

Note Each VDC has a different LACP system ID because the software adds the MAC address to this configured value.

Step 3

show lacp system-identifier

Example:

switch(config-if)# show lacp system-identifier

Displays the LACP system identifier.

Step 4

copy running-config startup-config

Example:

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

(Optional) Copies the running configuration to the startup configuration.

This example shows how to set the LACP system priority to 2500:

switch# configure terminal

switch(config)# lacp system-priority 2500

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