Cisco Failover Scenerio

Unanswered Question
Sep 7th, 2008
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We have cisco catalyst 3560 which is normally connected to the corporate headquarter via ATM connection, as a backup we have also ADSL connection connected to the switch. If ATM connection dies, ADSL connection takes cares of the connectivity. This is how EIGRP works anyway. But my question: Is there any way when router can choose to switch traffic to the backup connection if it detects that primary link performance (slow connection, longer network latency) has gone bad? The other day we had situation where one of the primary links performance were terrible but still soho offices still using that primary path creating network bottleneck on the link. It would have been better it switches routed to the backup ADSL connection to share the load. Any idea?

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Joseph W. Doherty Mon, 09/08/2008 - 15:58
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Don't believe EIGRP is (yet) supported with PfR.

I recall(?) EIGRP can perform dynamic routing based on load, although generally not recommended.

It might be possible to use IP SLAs to influence path selection (something OER/PfR can use "under the covers") but likely to be involved and difficult to maintain.


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