Possible EtherChannel + Failover

Unanswered Question
Jan 28th, 2009
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Hi,


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

http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a0080094820.shtml


multi-link ppp

http://www.cisco.com/en/US/tech/tk713/tk507/technologies_tech_note09186a0080112d3b.shtml

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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