Hi!
Today I faced with unexpected stack link lost between members of stack. Now stack in consistent stHow troubleshoot such problem?
Also I found strange why switch #1 restarted (as log shows, see futher) while link lost between #2 and #3?
c3850 stack configuration:
Switch# Role Mac Address Priority Version State
------------------------------------------------------------
1 Member 00bf.77c2.ae00 15 V02 Ready
*2 Active 00bf.77c3.1e80 1 V02 Ready
3 Standby ec1d.8bd5.0c80 1 V08 Ready
Stack Port Status Neighbors
Switch# Port 1 Port 2 Port 1 Port 2
--------------------------------------------------------
1 OK OK 2 3
2 OK OK 3 1
3 OK OK 1 2
Log events:
Sep 22 18:08:52.761: %STACKMGR-1-STACK_LINK_CHANGE:Switch 2 R0/0: stack_mgr: Stack port 2 on switch 2 is down
Sep 22 18:08:52.760: %STACKMGR-1-STACK_LINK_CHANGE:Switch 3 R0/0: stack_mgr: Stack port 1 on switch 3 is down
Sep 22 18:08:53.711: %SPANTREE-5-ROOTCHANGE: Root Changed for vlan 1: New Root Port is Port-channel24. New Root Mac Address is 0019.3056.6c80
Sep 22 18:08:53.872: %LINEPROTO-5-UPDOWN: Line protocol on Interface Port-channel1, changed state to down
Sep 22 18:08:53.950: %HMANRP-5-CHASSIS_DOWN_EVENT: Chassis 1 gone DOWN!
Sep 22 18:13:58.495: %STACKMGR-1-STACK_LINK_CHANGE:Switch 2 R0/0: stack_mgr: Stack port 2 on switch 2 is up
Sep 22 18:13:58.837: %STACKMGR-1-STACK_LINK_CHANGE:Switch 3 R0/0: stack_mgr: Stack port 1 on switch 3 is up
Sep 22 18:13:58.855: %STACKMGR-6-SWITCH_ADDED:Switch 2 R0/0: stack_mgr: Switch 1 has been added to the stack.
Sep 22 18:13:58.852: %STACKMGR-6-SWITCH_ADDED:Switch 3 R0/0: stack_mgr: Switch 1 has been added to the stack.
Sep 22 18:14:04.751: %PLATFORM_STACKPOWER-6-CABLE_EVENT: Switch 1 stack power cable 1 removed
Sep 22 18:14:05.907: %HMANRP-6-HMAN_IOS_CHANNEL_INFO: HMAN-IOS channel event for switch 1: EMP_RELAY: Channel UP!
Sep 22 18:14:05.991: %HMANRP-6-EMP_NO_ELECTION_INFO: Could not elect active EMP switch, setting emp active switch to 0: EMP_RELAY: Could not elect switch with mgmt port UP
Sep 22 18:15:18.131: %SIF_MGR-1-FAULTY_CABLE:Switch 1 R0/0: sif_mgr: High hardware interrupt seen on switch 1
