6880 VSS Standby Swith Not Forwarding Traffi

[DamianRC]

Hello,

While troubleshooting issues with Port channels to NetApp filers, we discovered that the standby 6880 in our VSS pair is not forwarding traffic.

The two 6880 switches are linked up to a pair of Nexus core switches, using a port channel running LACP.

Regarding the 6880s, one switch is reported as the master, and the other, secondary. We see no apparent issues, however, there are configured port-channels present on the primary that aren't on the secondary. Otherwise, all interfaces are labeled with the proper chassis and slot IDs.

The Cisco VSS doc says that both VSS devices should pass traffic. Am I missing something here.

Where should we focus to sort this out?

Thank you.

[balaji.bandi]

Can you post the configuration between Nexus and VSS ( Hope Nexus configured as vPC).

if you have some network topo how you connected netapp.

[Reza Sharifi]

Hi,

Both VSS chassis should forward traffic. Now, you may not see that the traffic is divided exactly but could be 60/40 or 30/70. 

I don't remember what Netapp default load balancing is set for but if the traffic is using only one chassis you may want to change the load balancing method and tune it for your environment to get the best results.

HTH

[Georg Pauwen]

Hello,

on a side note, and just to be sure, did you do the 'switch convert mode virtual' followed by a reload procedure ?

Either way, seeing the configs would indeed certainly help....