we had a network outage and logs isnt giving enough information. there was a change on etherchannel though prior to the outage. the logs doesnt given enough evidence
6500 A ---port channel 1---- 6500 B
6500 A is also connected to HPSW1 with portchannel 2
6500 B is also connected to HPSW2 with portchannel 3
HPSW1 and HPSW2 arent connected to each other
port channel 1 allows all vlan. the native vlan on port channel 2 and 3 is 113
what happened is
on 6500 A, 2 ports were addded to portchannel 2. these 2 ports were in shut mode.
similarly on 6500 B, 2 ports were added to portchannel 3. these 2 ports were in shut mode and they are not physically connected at the other end
once these 2 ports on both 6500 A and 6500 B were made up with no shut, we started getting the below error and network crahsed for few mins before it came up
HSRP failover happened for all the vlans
we suspect there was a stp loop prevention calculation which caused this. but the logs deosnt give enough evidence
will a port when added to a portchannel cause stp calculation.
in this scenario all vlans are allowed between both 6500. on HP switches stp is disabled.
we didnt see any other logs for this issue