Health Monitor reports a switch is down: SwitchIfIslDownWarn_Alert
Applies to
Issue
- Switch-02 (cluster switch) is not working. All traffic is served on Switch-01
- A Health Monitor alert is sent out via AutoSupport
Mar 17, 2022 08:29:08 CET HA Group Notification (Health Monitor process cshm: SwitchIfIslDownWarn_Alert[Switch-02 (xxxx)/Ethernet1/31]) ALERT
- In the
EMS-LOG-FILEsection of the AutoSupport:
Tue Mar 15 16:25:13 CET [Node-05: cshmd: hm.alert.raised:alert]: Alert Id = SwitchIfIslDownWarn_Alert ,
Alerting Resource = Switch-02(xxxx)/port-channel1 raised by monitor cluster-switch
- The switch log (
# show tech-support):
2022 Mar 15 16:21:07 Switch-02 %DIAG_PORT_LB-2-REWRITE_ENGINE_LOOPBACK_TEST_FAIL: Module:1
Test:RewriteEngine Loopback failed 10 consecutive times.
Faulty module: Error:Loopback test failed. Packets lost on the SUP in the receive direction
2022 Mar 15 16:21:07 Switch-02 %DIAGCLIENT-2-EEM_ACTION_HM_SHUTDOWN: Test <RewriteEngineLoopback>
has been disabled as a part of default EEM action
2022 Mar 15 16:21:07 Switch-02 %MODULE-4-MOD_WARNING: Module 1 (Serial number: xxxxx) reported warning due to Loopback test failed.
Packets lost on the SUP in the receive direction in device DEV_SUPERVISOR_CTRL (device error 0x41830059)
2022 Mar 15 16:21:07 Switch-02 %VSHD-5-VSHD_SYSLOG_CONFIG_I: Configured from vty by admin on vsh.bin.4635
- Switch commmand
# show module:
Switch-02# show module
Mod Ports Module-Type Model Status
---- ----------------- ----------------- --------------------- ---------
1 32 32x40G Supervisor N3K-C3132Q-V active *
Mod Sw Hw Slot
--- ---------------- ------ ----
1 7.0(3)I6(1) 1.0 NA
Mod MAC-Address(es) Serial-Num
--- -------------------------------------- ----------
1 d4-xx-xx-xx-xx-xx to d4-xx-xx-xx-xx-xx xxxx
Mod Online Diag Status
--- ------------------
1 Fail