Check the interfaces that comprise your ISLs. If the ISL is a PC, then check that interface. On the CLI use the command 'show interface fc x/y' or 'show interface port-channel x'. Verify that all VSANs in the allowed list are active, and none are isolated or initializing. Please check both ends of all ISL connections.
Not sure about the bug resurfacing, but one thing that might cause this kind of condition is that the SNMP user password is not set the same on both MDS. Can you verify with Device Manager that you can connect to both MDS using the same user/pass.
If that fails to resolve the issue, you may want to open a Service Request with your MDS service provider to get it documented.
Moquery is the command line cousin of Vizore, it's very helpful and efficient sometimes during the troubleshooting. This article aims to provide moquery cheat sheet to the users for some most common seen scenarios.
Here is the checklist before customers/partners contact Cisco TAC:
Firmware Version of APIC and Switch
Download Switch and APIC techsupport logs
Problem description (Symptoms with details)
Business impact (eg, what kind of services...
moquery usageAPIC moquerySwitchmoquery
This document discuss a common issue observed during the VMM integration & VM workload migration to ACI fabric.
VMware Virtual machines are hosted in Cisco UCS-B seri...