I am hoping to get some advice regarding BGP and route-map configuration that we have on our MPLS router. This config was implemented before my arrival and it has me somewhat confused. We are advertising many networks out of our main office, even though the only networks that reside here are 10.10.x.x and 10.100.x.x. The network commands have a route-map attached to them and I am not quite sure what this acheives. Below are my config snippets. I want to remove these excess network statements from BGP as I think they are creating routing loops within BGP.
I guess the use for route-map is not advertise the routes if it is tagged with the number. But I am not sure if BGP looks tag. Do a show ip bgp 10.20.0.0, see if the router advertises the route in BGP table.
So this is the weird thing, and the reason I want to get rid of these network commands. When everything is up and running normally, my router is only advertising two routes, 10.10.x.x and 10.100.x.x. See Info below. However, if one of my sites loses MPLS connectivity, lets say 10.50.x.x, then that route will then start advertising out of this site. So the below output would then have 10.50.0.0/16. Does that make sense?
Router> show ip bgp nei 10.254.100.2 advertised-routes
BGP table version is 2376, local router ID is 10.250.90.10
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
r RIB-failure, S Stale, m multipath, b backup-path, x best-external, f RT-Filter
So I guess the static routes are floating routes with AD 250, and the router learns those routes from other routing protocol in normal siatuation. I am wondering why is the router not advertising those routes in that case. Can you post the output of show ip route 10.20.0.0 from the router, and the full config for BGP section?
I think I have it figured out. We have a backup VPN that connects a remote site (lets call it Site A) to the main office (Site B). The reason the remote site networks are advertised from the main office is so Site C can access Site A through Site B when the backup VPN is up.
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