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backup link query


We got two links running into diff protocol (BGP on the 1st link & Eigrp running on the 2nd link).

Basically the voice is via the 1st link and the data is the other.

Now we wanted to make a failover to the 2nd link so when the 1st link failed it will automatically kick in to the 2nd link.

These are options I'm thinking of doing:

1. Add the same routes to EIGRP (2nd link) that has been advertised with BGP (1st link).

2. Consolidate the routing protocol to into one BGP protocol, but this job requires a good plan and design.

This is not possbile on our case though.

3. Add manually a static route on the same switch everytime the 1st link is down. -not practical.

Any more great ideas? sample config perhaps?



Re: backup link query

You can advertise the same networks in both EIGRP as well as BGP. Assuming that the BGP is e-bgp, these routes will be preffered and link 1 will be used for routing. If it is i-bgp, the eigrp link would be used and you might have to decrease the admin distance for bgp (not advisable).

The second option would be to have static routes for the network installed with a admin distance higher than BGP. this can be achieved by,

ip route

These routes will be kicked in the routing table if the BGP routes fail.

The best solution though would be to run bgpover both links and use MED/local pref to load-balance / backup.



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