I have a pair of 6509-E chassis running in a VSS configuration. Recently I upgraded the standby supervisor from 12.2-33.SXI7 to 12.2-33.SXI9, at which point every switches uplink connected to the standby chassis (all 8 modules) went err-disabled due to udld. A debug on these access switches revealed that the standby supervisor had stopped sending udld packets (amongst other random failures). Then, about 2 hours later after the code upgrade GOLD decided to reboot all the modules (except the supervisor), at which point udld replies started again, and normal traffic flow returned.
Has anyone come across anything like this before when upgrading IOS on 6Ks? Or could offer any explanation as to what might have caused this?
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