I'm running an MPLS network with BGP. I have three data centers with an Internet exit point in each 1. Site A (GA) 2. Site B (TX) 3. Site C (AZ).
The result I am looking for is to have east offices use Site A (GA) for outbound Internet and west offices use site B (TX) with both east and west failing over to site C (AZ). I can advertise a default route out of site A and B, then the sites will choose the closest Internet point using BGP path selection. For site C I can add an AS-path prepend for failover. But how do I get the sites to fail over to site C rather than site A or B (depending on which fails)?
There is one approach which providers follow. Please have a look
1- Inject default route from each site (A,B and C) 2- A provider will propogate this default route with specific RT value via.Export-map in vrf (So every default route will have different RT) 3- So all your offices (east and west) will have three default route. 4- provider here can use import-map to affect routing based on specific RT.
Say for east sites he can increase local preference for RT received from site-A and ....so all default routes will have different preference.
For incoming traffic you can use as-path prepending.
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