Question about 3750 stack SVI mac-address

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Nov 26th, 2009
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I have a question about 3750 stack. If master stack fail, new master will take old master, then SVI mac-address will be change.

3750 any command make SVI mac-address will not change?

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rupam_chakra1983 Thu, 11/26/2009 - 23:29
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I hope the persistence MAC address feature will help you out.

but you can use the " Persistense MAC address " faeture .

if you enable this then if the master goes down then by default it will keep the old mac address for 4 minutes by default.

and after the expiration of the time the MAC address will be replaced by the new stack master MAC address.

But  if you enter the command with a "0" value parameter in that case the MAC address will be there until you enter the no command.

The command is

stack-mac persistent timer 0

Note: beware of the consecuences in the production network

Plz rate it if found useful


chungmaster111 Thu, 11/26/2009 - 23:36
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thank you for your relpy.

STACK MAC Persistent Timer 0 this command do impact of network (such as STP, etherchannel, routing.....) ?

rupam_chakra1983 Fri, 11/27/2009 - 02:09
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it will not create a problem in normal case.

But if you are using the old master switch whose MAC address is binded in the stack in the same network.

there may be a chance of duplicate MAC address and network outage.

So to avoid this don't plug the removed master switch in the network.

plz rate this if you found it useful.



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