Can IOS be upgraded on a Cisco Catalyst 6509 switch without downtime?

Posted by Massimo on Server Fault See other posts from Server Fault or by Massimo
Published on 2010-03-16T18:36:32Z Indexed on 2010/03/16 18:41 UTC
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cisco

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ios

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upgrade

There's this Cisco Catalyst 6509 switch with 2 (two) supervisor modules; one of them is active, the other is (almost always) in standby.

We need to upgrade IOS; current version is 12.2.something (I can check exactly which one, if this does matter).

Can this be done without service interruption? Something like "upgrade the standby supervisor, activate it, upgrade the other one"?

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