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Correct settings for Virtual Connect and Nexus switch

 
chuckk281
Trusted Contributor

Correct settings for Virtual Connect and Nexus switch

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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Other comments or help?