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On a Nexus switch running LACP to a server that fails to set the collecting bit during the LACP negotiation in a timely fashion the ports will go error disabled due to sequence timeout on the Nexus switch in logs that look like this: %ETHPORT-5-IF_SEQ_ERROR: Error ("sequence timeout") communicating with MTS_SAP_ETH_PORT_CHANNEL_MGR for opcode MTS_OPC_ETHPM_PORT_CLEANUP (RID_PORT: Ethernet1/20) %ETH_PORT_CHANNEL-3-RSP_TIMEOUT: Component MTS_SAP_LACP timed out on response to opcode:MTS_OPC_PCM_RX_HW_ENABLED (for:Ethernet1/20) %ETHPORT-5-IF_SEQ_ERROR: Error ("required service is not responding") communicating with MTS_SAP_ETH_PORT_CHANNEL_MGR foropcode MTS_OPC_ETHPM_BUNDLE_MEMBER_BRINGUP (RID_PORT: Ethernet1/20)
Server is not handing the LACP negotiation correctly
Perform the following steps to get the ports to come up: 1) Shutdown the NICS from the server side 2) Delete the port-channel from the nexus side 3) Default all the physical interfaces 4) Re-create the port-channel 5) Re-apply to the physical interfaces Now the port-channel will come back up.
Please note that this "defect" was filed due to a specific issue with the end-host behaving incorrectly. The "fix" for this on NX-OS side is simply added logging of the issue & trigger for ease of troubleshooting & diagnosing. The ports will continue to error disable if the issue is not addressed properly on the end-host. Upgrading NX-OS will not resolve this problem as the problem does not lie within NX-OS. The misbehaving end-host must be fixed in order for the channel to form properly. The added syslog on NX-OS to spot this issue will have the following format (starting in 8.3(2)): "%ETH_PORT_CHANNEL-3-PEER_COLLECT_ENABLE_NOT_RCVD: LACP neighbor for Ethernetx/y may not have enabled collect bit in LACP PDU in stipulated time."
Cisco Integration
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