3750 switch Stack issue

[mahesh18]

                   Hi all,

We have 2 switches 3750 stacked.

One got rebooted

Here is log

May 15 23:41:50.413 MDT: %STACKMGR-4-SWITCH_REMOVED: Switch 1 has been REMOVED from the stack

May 15 23:41:50.488 MDT: %STACKMGR-4-MASTER_ELECTED: Switch 2 has been elected as MASTER of the stack

May 15 23:41:50.597 MDT: %SPANTREE-5-ROOTCHANGE: Root Changed for vlan 1: New Root Port is Port-channel1. New Root Mac Address is 001b.0de7.6740

May 15 23:41:50.966 MDT: %SPANTREE-5-TOPOTRAP: Topology Change Trap for vlan 1

May 15 23:41:52.074 MDT: %CFGMGR-6-APPLYING_RUNNING_CFG: as new master

000032: May 15 23:41:52.795 MDT: %LINK-3-UPDOWN: Interface Vlan150, changed state to up

000036: May 15 23:41:54.104 MDT: %STACKMGR-5-MASTER_READY: Master Switch 2 is READY

000046: May 15 23:42:06.913 MDT: %SPANTREE-5-ROOTCHANGE: Root Changed for vlan 219: New Root Port is Port-channel1. New Root Mac Address is 001b.0de7.6740

000047: May 15 23:42:06.922 MDT: %SPANTREE-5-TOPOTRAP: Topology Change Trap for     vlan 219

000064: May 16 00:38:28.022 MDT: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 1 Swi tch 2 has changed to state UP

000065: May 16 00:38:28.030 MDT: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 2 Swi tch 2 has changed to state UP

000066: May 16 00:39:01.233 MDT: %STACKMGR-4-SWITCH_ADDED: Switch 1 has been ADDED to the stack

000067: May 16 00:39:08.799 MDT: %STACKMGR-5-SWITCH_READY: Switch 1 is READY

000068: May 16 00:39:08.799 MDT: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 1 Swi tch 1 has changed to state UP

000069: May 16 00:39:08.799 MDT: %STACKMGR-4-STACK_LINK_CHANGE: Stack Port 2 Swich 1 has changed to state UP

May 16 00:39:10.661 MDT: %STACKMGR-5-SWITCH_READY: Switch 2 is READY                                           

May 16 00:39:10.896 MDT: %STACKMGR-5-MASTER_READY: Master Switch 2 is READY

May 16 00:39:10.896 MDT: %STACKMGR-5-SWITCH_READY: Switch 1 is READY

sh switch detail shows switch 2 is master now.

need to confirm if all is ok as master got flipped from 1 to switch 2?????????????

Thanks

[Kevin P Sheahan · Accepted solution]

This is normal stackwise behavior when the master gets rebooted. The other switch (your switch 2) assumed the master role once switch 1 went down and now that switch 1 has come back up it does NOT preempt the master role again.

In order for switch 1 to become the master again switch 2 will have to be rebooted, or otherwise removed from the stack.

Are you having problems at this time? If all seems well, all is well. The output that you've posted is normal behavior and not a cause for alarm.

Kind Regards,

Kevin

**Please remember to rate helpful posts as well as mark the question as 'answered' once your issue is resolved. This will help others to find your solution faster.

[mahesh18]

Hi Kevin,

Thanks for reply.

This never happens all the time.

So everything is ok that is great as i was new to stack switches.

Regards

mahesh