Configure Static Routes to Internet

CHRIS KALETH · ‎11-20-2008

We have a 12 site MPLS network managed by a large provider. We are using BGP on the MPLS side and eigrp internally. We have a ISP in Site 1 and Site 2 and we want to configure our network so all internet traffic goes through Site 1 (except for local site 2 traffic) and in the event Site 1 ISP is down the traffic will route through Site 2 ISP. Currently, we are running EIGRP at each site and out of the 12 sites 4 of them are using Site 2 ISP. How can we configure our managed router or internal L3 3750 to route Internet traffic to Site 1?

Both Site 1 and Site 2 have static routes that are redistributed pointing to the internet.

Site 1

router eigrp 1

redistribute connected

redistribute static

network 10.0.0.0

auto-summary

no eigrp log-neighbor-changes

!

ip classless

ip route 0.0.0.0 0.0.0.0 10.10.1.2

Site 2

router eigrp 1

redistribute static

network 10.0.0.0

no auto-summary

!

ip classless

ip route 0.0.0.0 0.0.0.0 10.10.1.1

ullasupendran · ‎11-20-2008

this can be achived using BGP as-path prepending.When u send the BGP updates to ur remote sites make sure that u prepend the as-path for route (0.0.0.0) from the site 2 .Use an access list that match the default route and attach it to a route map that sets the prepend value .This will make site 2 less preffered.

Ullas