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After switch reboot, CLUSTER NETWORK DEGRADED ALERT, SwitchIfIslDownWarn_Alert/ClusterIfIslDownWarn_Alert were seen

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fabric-interconnect-and-management-switches
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hw
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Applies to

  • ONTAP 9
  • CN1610 cluster switch
  • BES-53248 cluster switch
  • Cisco N9K-C9336C-FX2 cluster switch

Issue

  • Switch rebooted after a power outage or maintenance. 
  • The system reports the following CLUSTER NETWORK DEGRADED alerts in event logs:

[Node-01: vifmgr: callhome.clus.net.degraded:alert]: Call home for CLUSTER NETWORK DEGRADED: Total Packet Loss - Ping failures detected between Node-01_clus2 ( 169.XXX.XX.XXX ) on Node-01 and Node-04_clus1 ( 169.XXX.XX.XXX ) on Node-04

  • If using ISL LAG (link aggregate), you may see this ASUP alert:(Health Monitor process cshm: SwitchIfIslDownWarn_Alert[<switch_name>/<LAG_name>]) ALERT
  • In event logs:

[Node-04: cshmd: hm.alert.raised:alert]: Alert Id = SwitchIfIslDownWarn_Alert , Alerting Resource = cluster-sw1/ Link Aggregate 1 raised by monitor cluster-switch

  • The switch health is degraded:

cluster1::> system health subsystem show
Subsystem         Health
----------------- ------------------
SAS-connect       ok
Environment       ok
Memory            ok
Service-Processor ok
Switch-Health     degraded
CIFS-NDO          ok
Motherboard       ok

  • Switch show tech-support reports ISL ports disabled and down:

Switch# show port all

                 Admin     Physical   Physical   Link   Link    LACP   Actor
Intf      Type   Mode      Mode       Status     Status Trap    Mode   Timeout
--------- ------ --------- ---------- ---------- ------ ------- ------ --------
0/13      PC Mbr Disable   10G Full              Down   Enable  Enable long
0/14      PC Mbr Disable   10G Full              Down   Enable  Enable long
0/15      PC Mbr Disable   10G Full              Down   Enable  Enable long
0/16      PC Mbr Disable   10G Full              Down   Enable  Enable long

  • In the show running-config output of the switch, we see that all the ISL ports are shutdown:

    interface 0/13
    shutdown
    description 'ISL member port 13'
    mtu 9216
    exit
    interface 0/14
    shutdown
    description 'ISL member port 14'
    mtu 9216
    exit
    interface 0/15
    shutdown
    description 'ISL member port 15'
    mtu 9216
    exit
    interface 0/16
    shutdown
    description 'ISL member port 16'
    mtu 9216
    exit

 

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