Catalyst 3750X stacking convergence time

[daisuke6951]

HI I am Dai from Japan.

I have question regarding convergence
time in case of stack master will be switched over to other switch.

In my understating, when the stack master will be switched over to other switch based on election algorithm, convergence
time will be less than 10 second.

I tried to calculate concersion time during fail over testing but convergence
time was 21 second. I think it is too long...

Please refer to the attached network diagram.

Expected reasons

・I configured Rapid Spanning tree protocol between L3 and L3.

(But RSTP's convergence time is 2~3 second..)

I want everyone's help...

Thanks and Best Regards, Dai

[Reza Sharifi]

Hi,

Try this command and test the convergence time again:

stack-mac persistent

HTH

[daisuke6951]

Thank you so much for your reply!

If you know exptected reason, please let me know..

First, I need to know expected reason..

Thank you!

[Sanjay Shaw]

Hi Mates,

I have the same sort of scenario

site A:3750 (stack)==>ASA5525 (ver8.6)---------IPSEC--------ASA5525 (ver8.6)===>site-B 3750(stack).....

Scenario of testing>>>

When I power off the stack Master of site B. My outage time is near about 51 sec.

Please help to reduce this stack convergence time.

Will appreciate anybody helping to reduce this outage time.

Thanks ....Sanjay

[Parvesh Paliwal]

@ Sanjay

Can you post the configs and logs when you rebooted the stack master??