Reproducing route preference from as-path across iBGP distribution
I have inherited a BGP setup which involves a local BGP mesh consisting of 4 Routers at my site, all who are peered with each other (so each router has 3 iBGP peeerings with the other local routers).
Each of these routers has an eBGP peering with a single router at a remote site, where there are also 4 routers who have iBGP peerings with each other.
Now, my problem is this:
The received routes I am getting from the eBGP peers have an as-path prepending on them to control route preference, some have a single as-path, while others have several.
What i would like to be able to do is somehow preserve that route perference when I redistribute locally between my routers, but because as-path is lost and local routes are prefered, I end up in a situation where all of my routers prefer to send the external routes to each other instead of externally.
I can modify external routes with a higher local preference, but all that does is make each router prefer to route back directly to it external peer.
Can anyone offer a way for me to do the equivilent of transfering the as-path to locally distributed routes?
Reproducing route preference from as-path across iBGP distributi
Brief overview of the design is this:
We have two Datacenters with two routers at each site (so four routers) and we are using a Telco Mobile APN to get private Mobile traffic to servers inside these DC's.
The Telco also has two Datacentres, also with two routers at each site (also four routers).
On both the Telco side, and our customer side, we have the local routers fully meshed with iBGP.
Each router on our customer side has a single eBGP peering with a a single router on the Telco side.
The end game is to maximise availability so that we can lose a DC on either side, or router, and traffic will continue to flow.
In terms of routing, we have two private ranges, one in each DC, and the Telco also has two private ranges, one in each DC.
We are using as-path prepending to control our prefered location for our two ranges, and the Telco is doing the same.
BGP Config for one router below (One of the routers in our customer DC in LA), the other customer routers are configured pretty similar. The current modification of the local-prefix of routes learned from the telco I think is a fiddle to force routing to the telco ranges directly back to the telco peer when it is online, otherwise the iBGP routes learned from the other routers take priority, which causes issues.
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