Saturday, July 20, 2019

Trunk not working?

I have two nexus 9K switches operating in a vpc domain with the svi’s in hsrp. For the sake of keeping it simple while troubleshooting, I turned off the secondary nexus and took hsrp off.

The problem I have is when I trunk 10 2960X switches to the nexus, half of them show up in cdp neighbor and “show int trunk” shows all the vlans forwarding on the trunk however I cannot ping any of the SVIs on the nexus. The default route is there.

I decided to test the switches that are trunking properly and everything works fine. I then took one of the bad switches with the same configuration and trunked it to a working switch and they were able to ping the SVIs on the nexus. What gives??



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