Thursday, March 11, 2021

Weird issues on VM's after vLAN move

So we just re-did our VLAN 1, and moved all the hosts and SVI to vlan 100 for reasons of doing disjointed networks off our FI's in our UCS.

Everything went well, but now some random (2 out of a few 1000 so far) VM's are experiencing issues where they can't ping out their subnet. They can't ping the gateway to the VLAN. All other VM's within the VLAN can communicate fine.

So immediately I'm like okay, subnet/gateway issues. The VM in question just cannot ping the gateway, 10.1.1.1, but all other VM's in the subnet it can ping just fine. From the NEXUS 9k I can ping the VM from the SVI of the same vlan, but not outside of it. Clear IP arp and mac of the VM, nothing.

The weird thing is that when we remove the nic on the VM, and add new one, (giving it a new MAC), the issue resolves.

When I do a show arp on NEXUS 2, I do see some IP's have the * flag which is "Adjacencies learnt on non-active FHRP router." BUT, I see that * on some other IP's in other networks that don't seem to have any issues.



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