Nexus syslog message - Is this a warning message?

[Stuart C]

Hi All, 

I hope that someone can answer this quick for me?  I am seeing the following in Nexus logs.

VPC-2-L3_VPC_UNEQUAL_WEIGHT:Layer3 peer-router is enabled.  Please make sure both vPC peers have the same L3 routing configuration

All the info out there I can find out there suggests this may be a simple advisory syslog message?  Any idea if that's the case, or, is it actually a message to say there is a problem?

Thanks

[Georg Pauwen]

Hello,

you could be running into the bug below:

N7K 7.2 %VPC-2-L3_VPC_UNEQUAL_WEIGHT:
CSCuw08846
Description
Symptom:
layer-3 peer-router. As soon as we configure this command we notice the following logs:

%$ VDC-1 %$ %VPC-2-L3_VPC_UNEQUAL_WEIGHT: Unequal weight routing is not supported in L3 over vPC. Please make sure both vPC peers have equal link cost configuration

- CPU utilization could be high due to MCECM process

Conditions:
when layer-3 peer-router is configured

Workaround:
Disable them using the command: "no layer3 peer-router syslog".

Note: It may be necessary to configure "layer3 peer-router syslog" before configuring "no layer3 peer-router syslog" in order to stop the logs.

[Stuart C]

Yes that is true I did see that. But I couldn’t find anything specific for the Nexus 9K.
I did configure no layer3 peer-router syslog yesterday and it stopped the message. I just wanted to confirm though that the message was only a warning message not anything implying the config was wrong?
Thanks

[Georg Pauwen]

Hello,

if you don't experience any 'real' problems, and if the workaround stopped the syslog messages, chances are quite high that the bug mentioned above was causing this...

Keep monitoring it for a while...

[John Hartman]

Please note that this command need to go under “vpc domain <>” config.  

Here are the steps to get into vpc domain config mode and apply the command:

++++

SW# conf t

Enter configuration commands, one per line.  End with CNTL/Z.

SW(config)# vpc domain <#>    (Put your vpc domain number here)

SW(config-vpc-domain)# layer3 peer-router syslog

SW(config-vpc-domain)# no layer3 peer-router syslog

SW(config-vpc-domain)#exit

++++