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ISL link flapping on Cisco Cluster switches

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Applies to

  • Cisco N9336 cluster switch
  • ISL(Cisco Inter-Switch Link)

Issue

Switch ISL port 1/36 flapping.
  • EMS alert:

HA Group Notification (Health Monitor process cshm: ClusterIfIslDownWarn_Alert[SWITCHNAME(XXXXX)/Ethernet1/36]) ALERT
HA Group Notification (Health Monitor process cshm: ClusterIfIslDownWarn_Alert[SWITCHNAME(XXXXX)/Ethernet1/36]) ALERT

  • Switch alert:

2023 Oct 26 16:15:28 SWITCHNAME %ETH_PORT_CHANNEL-5-PORT_DOWN: port-channel1: Ethernet1/36 is down
2023 Oct 26 16:15:28 SWITCHNAME %ETHPORT-5-IF_DOWN_LINK_FAILURE: Interface Ethernet1/36 is down (Link failure)
2023 Oct 26 16:15:44 SWITCHNAME %ETHPORT-5-SPEED: Interface Ethernet1/36, operational speed changed to 100 Gbps
2023 Oct 26 16:15:44 SWITCHNAME %ETHPORT-5-IF_DUPLEX: Interface Ethernet1/36, operational duplex mode changed to Full
2023 Oct 26 16:15:44 SWITCHNAME %ETHPORT-5-IF_RX_FLOW_CONTROL: Interface Ethernet1/36, operational Receive Flow Control state changed to off
2023 Oct 26 16:15:44 SWITCHNAME %ETHPORT-5-IF_TX_FLOW_CONTROL: Interface Ethernet1/36, operational Transmit Flow Control state changed to off
2023 Oct 26 16:15:48 SWITCHNAME %ETH_PORT_CHANNEL-5-PORT_UP: port-channel1: Ethernet1/36 is up
2023 Oct 26 16:15:48 SWITCHNAME %ETHPORT-5-IF_UP: Interface Ethernet1/36 is up in mode trunk

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