port on switch redundency

Unanswered Question
Aug 28th, 2007
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Dear All,

i had Cat.4506(IOS)is backup and Cat.4006(OS)is primary.so i would like to do on port switch redundency( i mean if connection primary down, it connect to backup line automatic.

Please see the attach file.

Please advice me on this case.

Best Regards,


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Hi Join,

This can be achieved using STP (spanning tree) which is automatically enabled on switches. This protocol ensures that there is no loop in a switched network, but also provides redundancy (assuming multiple links and loop). In your design you will have to tune the default settings to force the root bridge election to result the primary 4006 top become the root bridge.

If the interconnection links are trunk and your switches support pvst (per vlan spanning tree) then you have the options to load balance the traffic through the primary and backup links.

Hope it helps rate if does,


join_sn09 Tue, 08/28/2007 - 23:41
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Dear Krisztian,

Thank you for your help.

Do you have some document for tell about this case?

Best Regards,


enriquebs Tue, 08/28/2007 - 23:55
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You can also set up a port-channel. That way you can take advantage of using both interfaces at the same time, if one of the interfaces goes down the port-channel won't stop working and the network will be stable.



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