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.
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.
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