3750 Switch Stack - Replacing Failed Switch

Answered Question
Jan 18th, 2011

I have switch stacks with a mix of 24/48 port, PoE/Non-PoE switch types.  I plan  on using a common spare 48 port PoE, if my 24 port PoE switch fails, will the provision config be used for the first 24 ports and then the default config for the remaining 25-48 ports?

In addition to setting the Priority level to 15, do I need to config the stack member number on my spare switch or will it assume the number of the failed switch?

I have this problem too.
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Correct Answer by Leo Laohoo about 3 years 3 months ago

What I am trying to accomplish is replace a failed 24 port switch, including the existing configuration.  I want to be able to install the 48 port switch, and have the provisioned config from the 24 port switch loaded on the 48 port switch. I don't want to have to reconfigure the 48 port siwthc.

You don't need to re-configure the replacement switch because the current configuration is being "shared" by the entire existing stack.  Make sure the replacement switch does not have any configuration (including VLAN.dat file), same IOS version and same feature set (example:  IP Base).
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Leo Laohoo Wed, 01/19/2011 - 00:03

If your 24-port switch fails and you want to replace it with a 48-port, then do this:

1.  Remove the 24-port provisioning:  no switch provisioning ; and

2.  Add the 48-port:  switch provisioning  <48-port model number>

dvaggalis Wed, 01/19/2011 - 06:00

What I am trying to accomplish is replace a failed 24 port switch, including the existing configuration.  I want to be able to install the 48 port switch, and have the provisioned config from the 24 port switch loaded on the 48 port switch. I don't want to have to reconfigure the 48 port siwthc.

Correct Answer
Leo Laohoo Wed, 01/19/2011 - 13:44

What I am trying to accomplish is replace a failed 24 port switch, including the existing configuration.  I want to be able to install the 48 port switch, and have the provisioned config from the 24 port switch loaded on the 48 port switch. I don't want to have to reconfigure the 48 port siwthc.

You don't need to re-configure the replacement switch because the current configuration is being "shared" by the entire existing stack.  Make sure the replacement switch does not have any configuration (including VLAN.dat file), same IOS version and same feature set (example:  IP Base).
dvaggalis Tue, 01/25/2011 - 10:49

Instead of replacing the 24 port switch with a 48 port switch and having to change the "24-port provision"  statement, can I replace a 3750G-24 with a 3750X-24 and not have to make any config changes, just physically remove the failed switch and install the replacement switch.

I'm trying to see if I can have technicians, that are already onsite but who have no Cisco configuration experience, able to replace a failed switch in the stack.    

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Posted January 18, 2011 at 9:16 PM
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