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LACP port flapping on one node due to missing Discovered Device Interface

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ontap-9
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nas
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Applies to

  • ONTAP 9
  • LACP

Issue

  • LACP port flapping on one node as per below EMS logs. 

Thu Aug 08 09:13:56 +1000 [Node-01: intr: net.ifgrp.lacp.link.active:notice]: ifgrp a0a, port e0f has transitioned to the active state.
Thu Aug 08 09:15:20 +1000 [Node-01: intr: net.ifgrp.lacp.link.inactive:error]: ifgrp a0a, port e0f has transitioned to an inactive state. The interface group is in a degraded state.
Thu Aug 08 09:18:12 +1000 [Node-01: intr: net.ifgrp.lacp.link.active:notice]: ifgrp a0a, port e0f has transitioned to the active state.
Thu Aug 08 09:21:05 +1000 [Node-01: intr: net.ifgrp.lacp.link.inactive:error]: ifgrp a0a, port e0f has transitioned to an inactive state. The interface group is in a degraded state.

  • All ifgroup and physical ports are up and healthy. 
  • No errors in ifstat for port in question.
  • LACP port configuration on ONTAP is correct  as per ifconfig -vv outputs.
  • LACP configuration is correct on the switch side as well.
  • network device-discovery show outputs shows no neighbour device connected to the the port in question

cluster::> network device-discovery show 

Node/       Local  Discovered
Protocol    Port   Device           Interface     
Platform    
----------- ------ ---------------- ----------------  
Node-01     e0c    192.9x.9.2xx     GigabitEthernet1/0/21
Node-01     e0d    192.9x.9.2xx     GigabitEthernet1/0/22
Node-01     e0e    192.9x.9.2xx     GigabitEthernet1/0/23
Node-01     e0f                                           <<<<<<<<<<<<

  • The port in question is not showing any neighbor device in Device Discovery due to some unknown issue on the switch end. 
  • Below troubleshooting steps can be performed to isolate the issue.
    • Verify the status of ports in ifgrp.
    • Perform loopback test to see if ports are online and in green.
    • Verify the switch side ports to see if they are online.
    • Using light source meter verify the cables.
    • Reseat the cables and SFPs on either ends.
    • Port isolation can be performed to check if port is working good and coming up while performing a loopback test.
    • If even after performing loopback test and connecting the cables to their original positions the ports still go down then proceed with solution.

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