Possible EtherChannel + Failover

Unanswered Question
Jan 28th, 2009
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Please advice and suggest ....

I have 4-sites all connected with each other.

** Site A is connected with Site B with

Two physical links 10MB and 15MB

** Site A is connected with Site C with

Two physical links 8MB and 10MB

** Site A is connected with Site D with

Two physical links 10MB and 4MB

** Site B is connected with Site C with

One physical links 3MB

** Site B is connected with Site D with

One physical links 5MB

Each link from Site A to Site B is configured as vlan and same for all sites...

Routing Protocol used is OSPF and to do failover between links and sites

we play with OSPF cost.....

((( New Requirement ))) : To combine bandwidth of two physical links between Site A && Site B

and configure failover of link with other sites.

[Example : if the links between Site A and Site B is down then Site A should reach Site B via

Site C ]]

If more information is needed please inform...

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chuckwirth Thu, 01/29/2009 - 12:33
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What is your connection type, isdn, frame-relay, partial T1, direct fiber/copper ethernet?

Are the links coming from/to the same router?

If you switch to EIGRP you can use unequal cost load-balancing and have it satisfy all of your requirements, load-balancing and failover.

OSPF takes bandwidth into consideration when calculating cost, so I'm not sure why you are manually manipulating it.

load balancing


multi-link ppp


Amin Shaikh Fri, 01/30/2009 - 13:00
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Thanks for your reply.

Connection type is Copper Ethernet at both end.

Is there an example link from Cisco for EIGRP load balancing...


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