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New Member

Double Uplink between two catalysts 3550 for failover

Hi,

how can I do a configuration where I would have two switches 3550 with two uplinks between them for failover, but in case that the main uplink starts flapping I would prefer that second one stays. I mean failover but without recovery. Can you help me on that?

Thanks.

Jorge

3 REPLIES
New Member

Re: Double Uplink between two catalysts 3550 for failover

I would use a EtherChannel, here is a link for you.

http://www.cisco.com/en/US/partner/products/hw/switches/ps646/products_configuration_guide_chapter09186a008031ffba.html

If you need to have other VLANs than VLAN 1 going over the link, simply make the link a trunk.

This is in addion to setting up the ehterchannel.

http://www.cisco.com/en/US/partner/products/hw/switches/ps646/products_configuration_guide_chapter09186a008031fe94.html#wp1100024

Hope this helps.

New Member

Re: Double Uplink between two catalysts 3550 for failover

But how do I then enforce that all traffic goes via one of the Uplinks and the second one is ONLY for failover?

Jorge

New Member

Re: Double Uplink between two catalysts 3550 for failover

Couldn't you connect two Uplinks. Then, spanning tree should put one of the ports in a blocking state and the other in a forwarding state. That way, if the first link goes down, SPanning Tree would recalculate and change the link to forwarding.

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