Internet at 2 locations

Unanswered Question

I have the following scenario:


Site A has a link to the Internet

Site B also has a link to the Internet.

Site A & B have a point-2-point link between them and running EIGRP.

Each site has a default route pointed to a Pix firewall.

Let's say Site A is 192.168.1.0/24 and Site B is 192.168.2.0/24 and running EIGRP. What's the easiest way for Site A to go through Site B in case it loses its Internet link and vice-versa for Site B?


Thanks!

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Jon Marshall Wed, 05/13/2009 - 02:44
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Easiest way would be to use floating statics ie.


Site A


ip route 0.0.0.0 0.0.0.0

ip route 0.0.0.0 0.0.0.0 250


Site B


ip route 0.0.0.0 0.0.0.0 < site B pix>

ip route 0.0.0.0 0.0.0.0 250


Jon

Joseph W. Doherty Wed, 05/13/2009 - 03:31
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Another variation, might be injection of the default route into EIGRP at both sites. Each site should chose the "closest" Internet exit, but if either site withdraws its default, then all Internet traffic should flow toward the remaining Internet exit.


An issue with both these approaches, is "knowing" the Internet link is down. If Internet "down" can be more than link drop, you might also need to use some form of object tracking.

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