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Cisco Bug: CSCvv71056 - Network temporary loop when vpc leg gets LACP reinit

Last Modified

Sep 15, 2020

Products (1)

  • Cisco Nexus 9000 Series Switches

Known Affected Releases

7.0(3)I7(9)

Description (partial)

Symptom:
VPC peer got M/Bcast over peer-link might forward back to vpc leg when that leg got LACP re-init

If you're seeing such message sequence, suspect hit this bug

2020 Sep  7 16:46:48.927 N9508-2 %ETH_PORT_CHANNEL-5-PORT_DOWN: port-channel64: Ethernet3/15 is down
2020 Sep  7 16:46:49.189 N9508-2 %L2FM-4-L2FM_MAC_MOVE2: Mac 4ce9.e4c8.6000 in vlan 2301 has moved between Po64 to Eth3/20
2020 Sep  7 16:46:49.433 N9508-2 %L2FM-4-L2FM_MAC_MOVE2: Mac 4ce9.e4c8.6000 in vlan 2301 has moved between Po64 to Eth3/20
2020 Sep  7 16:46:50.643 N9508-2 %ETHPORT-5-IF_DOWN_INITIALIZING: Interface Ethernet3/15 is down (Initializing)
2020 Sep  7 16:46:52.933 N9508-2 %ETH_PORT_CHANNEL-5-PORT_UP: port-channel64: Ethernet3/15 is up
2020 Sep  7 16:46:54.425 N9508-2 %ETHPORT-5-IF_UP: Interface Ethernet3/15 is up in mode trunk

Conditions:
vpc leg got LACP re-init
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