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Cisco stacked 3750 switch

Hi,

I have a stacked Cisco 3750 switch, two of them in this stack. They have dual power to a Cisco 2200 redundant power unit. It appears (according to tac) that the on board power unit on the second switch in the stack has failed, and the 2200 is what is keeping it up and running. They told me the onboard power supply is not hotswappable, and the second switch in the stack must be replaced.

What is the best way to do this ? Do I shut down both switches, swap out the second switch, plug cables back in and power up ? Do I just shutdown the second switch with the failed power supply, pop in the new one, plug in cables and power up ? The cfg is on the first switch in the stack correct ? Is there anything I need to pull off of the second switch ?

Thanks

eeRoot

If the switch with the failed power supply is NOT the stack master and is NOT the switch with the network uplink to the rest of the network, then you can replace it while leaving the primary switch up. In a stack, the config is stored on all switches and synchronized automatically whenever there is a config change. When the new switch powers up, it will inheret the config from the master switch.

Also, it would be a good practive to make sure that the new switch has the same firmeware version as the switch it's replacing.

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aleghart

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Elemental12

ASKER

ewww ... Very nice thought guys, I did not even think of the firmware between the two. I will add that to the list. Dumb question, but what is the cmd to find out which one is the master ?

Thanks

Elemental12

ASKER

show ver showed me :

Switch Ports Model SW Version SW Image
------ ----- ----- ---------- ----------
* 1 52 WS-C3750G-48TS 12.2(35)SE2 C3750-IPSERVICESK9-M
2 52 WS-C3750G-48TS 12.2(35)SE2 C3750-IPSERVICESK9-M

So i assume the top switch is the master. I am going to confirm by comparing ints plugged in (ie, if g0/1 in switch 1 is active, and g0/1 in switch 2 is inactive, and I go down there, and the top switch has something plugged into g0/1, then I know the top one is the master). And as Cisco says switch 2 is the one with the failed power supply, then I know the bottom one is the one to swap out ...

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kdearing

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Elemental12

ASKER

Ok, so I confirmed which physical switch is switch 2. Once it shows up, I will check the version and downgrade accordingly. Anything else I need to keep an eye out for ?

Thanks

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aleghart

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Elemental12

ASKER

Thank you for the suggestion of racking first ... Unfortunately, there are items above and below, so I cannot rack ahead of time, but I can label the interfaces before I pull them so I can put them back in the same port on the new one.