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New Member

Redundant GigabitEthernet Links between 6509 and 3550

I currently have a 6509 core switch with three 3500s connected with one link each, using short-range GBIC & MM fiber. The "between switch" links are configured as 802.1q VLAN tagging trunks. Now I wish to install a fourth 3500, using two redundant fiber paths. Will someone point me toward an example config? I know I have to use STP, but do not have any experience setting it up.

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New Member

Re: Redundant GigabitEthernet Links between 6509 and 3550

I currently have a 6509 core switch with three 3500s connected with one link each, using short-range GBIC & MM fiber. The "between switch" links are configured as 802.1q VLAN tagging trunks. Now I wish to install a fourth 3500, using dual redundant fiber paths. Will someone point me toward an example config? I know I have to use STP, but do not have any experience setting it up.

Cisco Employee

Re: Redundant GigabitEthernet Links between 6509 and 3550

STP is enabled by default. Keep your 6500 as the STP root switch. If you have multiple VLANs, configure links to your 4th 3500 as a trunk. You should be able find sample configs at

http://www.cisco.com/warp/public/473/

Cisco Employee

Re: Redundant GigabitEthernet Links between 6509 and 3550

do you two choices

either setup as the etherchannel- in this case, it will be do both load balancing and redundancy

http://www.cisco.com/warp/customer/473/#EtherChannel

or just two parallel links and the spanning tree will block one automatically.

http://www.cisco.com/warp/customer/473/16.html

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