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Switch unreachable alert causes switch health to be degraded

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ontap-9
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hw
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Applies to

  • ONTAP 9
  • FAS/AFF Systems
  • Cluster Network Switches

Issue

  • SwitchUnreachable_Alert is reported on a cluster switch.
  • The reported cluster switch is not being monitored with the following reason:

::> system switch ethernet show
Switch                      Type               Address          Model
--------------------------- ------------------ ---------------- ---------------
Switch_1(FLMXXXXXXXX)     cluster-network    19.225.XXX.XX     NX3132V
     Serial Number: FLMXXXXXXXX
      Is Monitored: false 
            Reason: IP address not reachable
  Software Version: Cisco Nexus Operating System (NX-OS) Software, Version 7.0(3)I4(1)
    Version Source: CDP

  • In some cases, the health alert may be raised and cleared automatically within a few minutes:

[Node1: cshmd: hm.alert.raised:alert]: Alert Id = SwitchUnreachable_Alert , Alerting Resource = SW1  raised by monitor ethernet-switch
[Node1: cshmd: hm.alert.cleared:notice]: Alert Id = SwitchUnreachable_Alert , Alerting Resource = SW1 cleared by monitor ethernet-switch
 

  • From SYSTEM-HEALTH-ALERT.XML section of the autosupport, the following details are seen:

Alert ID                  SwitchUnreachable_Alert
Subsystem                 Switch-Health
Perceived Severity        Major
Alerting Resource         Switch_1(FLMXXXXXXXX)
Description               The specified IP address "19.225.XXX.XX" for the ethernet switch                           "Switch_1(FLMXXXXXXXX)" is not reachable from the local node.
Possible Effect           Monitoring of the switch and log collection will not function.

  • The switch health is degraded because of this alert:

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

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