I have a strange setup (inherited but not created by me) 3 ISPs, BGP with all of them. I take full routes from ISP 1 (mid sized) partial routes from ISP 2 (Huge) and am trying to add ISP3 at another location. The locations are connected via 2 T1s Both locations have cisco 7206vxr NPE 300s. I have ibgp set up between the 2 locations, it's talking but does not seem to redistribute the routes. I see them when I do a sh ip bgp, but I can't use them (it times out) Another problem is that for some reason I have no advertised routes. Granted my BGP is very rusty, and was never great.
gw2>sh ip bgp neighbors 207.x.x.x advertised-routes
my config may be wong I dunno (on the router that doesn't announce anything):
There are several issues that will keep routes in the BGP table out of the routing table.
The first thing I notice is that the
"no synchronization" command isn't present.
It is required if you do not want to redistribute BGP into your IGP (generally a bad idea to redistribute).
The second major cause is that BGP will, by default, advertise the next hop as the router in the next AS.
If that route (BGP next hop) is not in the routing table, the BGP routes will not be inserted in the table. The fix for this is the next-hop-self. It appears that this is correct in your config, but without addresses, its hard to be absolutely sure.
Problem 1: Can you elaborate on your first question?
Problem 2: You need to have two things accomplished in order for BGP to advertise.
a) have a network statement - which you do.
b) you need to have that exact block in the router's routing table. ex: if you have network x.x.x.x mask 255.255.224.0, when you do sh ip route x.x.x.x 255.255.224.0, x.x.x.x/19 has to be pointing somewhere rather it be null0 or a router it doesn't care.
Thanks everyone, it was the "no synchronization" command. I just sat down with my trusty old "Internet Routing Architectures" book and read till I figured it out. right about then I checked back here and I found that you all had already given me an answer. t's good to see so much help is readily available, again, thanks.
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