Redistributing BGP into EIGRP

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Jun 21st, 2010
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I have a scenario that I've been playing around with that compares the functionality between using iBGP vs. EIGRP in a failover setup. So far, iBGP proves to be more "customizable" in the fact that I can do conditional advertisements. The problem that I run into is this:

I have 2 routers and a L3 switch that currently runs BGP. One router (Router A) has a DS3 connection to the provider and a LAN connection into my switch. The other router (Router B) has only a LAN connection to my switch and a LAN connection to a MAN. With EIGRP, when I shut the ethernet interface on Router A, everything converges very quickly (much more quickly than with BGP). But, when I shut the serial side on Router A, the LAN side is still up and eigrp will eventually converge, but it takes a MUCH longer time. Is there something, route maps/distribution lists/eigrp options, that will allow me to do something like a conditional advertisement with eigrp? What I'm currently doing to make this faster in bgp is a conditional advertisement that says if the serial side subnet is missing, then deny advertising any routes. That forces all traffic through my backup router (Router B).



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Laurent Aubert Mon, 06/21/2010 - 19:24
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Hi John,

How do you learn your WAN remote subnets on router A (from the DS3 link)  ? EIGRP should still be faster than BGP.

A diagram and the config could help.



Tharak Abraham Tue, 06/22/2010 - 22:49
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You should be knowing that BGP detects direct failures slower than EIGRP.

You need to manipulate the bgp timers for that, if i correctly understood your scenario.


You may even consider IP SLA usage.


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