Hello,
I'm having a weird issue with vPC on N5K (5548P), running 5.0(3)N1(1) - Today I noticed that the N5K infrastructure had crashed. While looking into it, the problem was with vPC. What happened was that the switch noticed a loop, and brought down the vPC peer-link.
vPC domain id : 420
Peer status : peer link is down
vPC keep-alive status : peer is alive
So the Port channel holding the vPC peer-link was down, whereas the individual members in the link were up. I tried rebuilding the port-channel, rebuilding the vPC peer-link etc, but no luck. Each N5K was showing that it was to ROOT for ALL the VLANS (though originally each N5K was the root for one set of VLANS).
I had to shutdown the second N5K to have the environment up and running. Looking at the time when everything happened, the logs are of the form:
06:55:37 %STP-2-VPC_PEER_LINK_INCONSIST_BLOCK: vPC peer-link detected BPDU receive timeout blocking Po2 VLAN: 2,5,101,105,109.
06:55:48 %STP-2-VPC_PEER_LINK_INCONSIST_BLOCK: vPC peer-link detected Bridge Assurance Inconsistency blocking Po2 VLAN: 1-2,4-5,101,103,105,107,109.
06:55:54 %STP-2-BRIDGE_ASSURANCE_BLOCK: Bridge Assurance blocking port Po2 VLAN: 1-2,4-5,101,103,105,107,109.
06:56:22 %ETH_PORT_CHANNEL-5-PORT_DOWN: port-channel2: Ethernet2/14 is down
06:56:22 %ETH_PORT_CHANNEL-5-FOP_CHANGED: port-channel2: first operational port changed from Ethernet2/14 to Ethernet2/16
06:56:22 %ETHPORT-5-IF_DOWN_INITIALIZING: Interface Ethernet2/14 is down (Initializing)
06:56:32 %ETH_PORT_CHANNEL-4-PORT_INDIVIDUAL: port Ethernet2/14 is operationally individual
06:56:32 %ETHPORT-5-IF_UP: Interface Ethernet2/14 is up in mode trunk
06:56:33 %ETH_PORT_CHANNEL-5-PORT_DOWN: port-channel2: Ethernet2/16 is down
06:56:33 %ETH_PORT_CHANNEL-5-FOP_CHANGED: port-channel2: first operational port changed from Ethernet2/16 to Ethernet2/13
06:56:33 %ETHPORT-5-IF_DOWN_INITIALIZING: Interface Ethernet2/16 is down (Initializing)
06:56:33 %ETH_PORT_CHANNEL-5-PORT_DOWN: port-channel2: Ethernet2/15 is down
06:56:33 %ETHPORT-5-IF_DOWN_INITIALIZING: Interface Ethernet2/15 is down (Initializing)
06:56:36 %VPC-2-VPC_SUSP_ALL_VPC: Peer-link going down, suspending all vPCs on secondary
So basically, after this, all the links from the vPC unbundled. Has anyone come across this issue before?
Any thoughts would be highly appreciated.
Thanks.
