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

[Chris_78]

Hi

I'm keep getting the following msg on our nexus 3k switches. 

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

I'm running OSPF, VPC and VRRP on the switches.

sh vpc 
Legend:
(*) - local vPC is down, forwarding via vPC peer-link

vPC domain id : 1
Peer status : peer adjacency formed ok
vPC keep-alive status : peer is alive
Configuration consistency status : success
Per-vlan consistency status : success
Type-2 consistency status : success
vPC role : primary, operational secondary
Number of vPCs configured : 6
Peer Gateway : Enabled
Dual-active excluded VLANs : -
Graceful Consistency Check : Enabled
Auto-recovery status : Enabled, timer is off.(timeout = 240s)
Delay-restore status : Timer is off.(timeout = 60s)
Delay-restore SVI status : Timer is off.(timeout = 10s)
Operational Layer3 Peer-router : Enabled

Any info is greatly appreciated!

Thanks!

Chris

[Peter Paluch · Accepted solution]

Hello Chris,

That message is admittedly very confusing. What it states is merely a warning that you should make sure that both vPC peers are, from the Layer3 routing perspective, equivalent - they should have exactly the same routing table contents, the same OSPF link costs, the same OSPF neighbors, etc. However, the NX-OS does not make any comparison of these details between the vPC peers - the message is merely a reminder for you to monitor it yourself. In other words, it is not an indication of a misconfiguration, rather a periodic notification - and an annoying one, I have to say.

You can deactivate that logging message by configuring no layer3 peer-router syslog in the vpc domain configuration section.

Best regards,
Peter

[stanibarb]

Hi Peter,

Disabling the layer3 peer-router syslog what other messages will be also ignored? 

Thank you,

[Edson]

Thank you for the explanation!

[Travis-Fleming]

What if we get that message and we have that no command already? Eeek!

Actually I found this link that it's a bug and you may have to enable it, then disable it now.

https://bst.cloudapps.cisco.com/bugsearch/bug/CSCuw08846/?rfs=iqvred 

vpc domain 1
peer-keepalive destination 192.168.1.2 source 192.168.1.1 vrf VPC-KEEPALIVE
no layer3 peer-router syslog
peer-gateway
layer3 peer-router

%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.

[steltek]

Extremely helpful! I wonder how much of my time is spent troubleshooting things working normally vs misconfigurations. 

Obviously, bugs beat both, but who could expect a multi-billion-dollar networking company to test their products.

[Chris_78]

Thanks Peter! Much appreciated the fast response!