I asked this in the Certifications forum but it quieted the room:
Sethtek-G and Sethtek-H are set up as BGP neighbors in AS 190. PPP serial link between the two, with G's serial IP 172.16.0.1; H's ends in .2.
Each has three loopback interfaces configured: G has 188.8.131.52; 184.108.40.206; 220.127.116.11. H has the same but with 208's in 207's places.
I declared the first two in each's BGP process (saving the third for later debugging experiments).
So each of the declared loopback networks shows up just fine in each other's BGP tables, but not in their IP routing tables. Did I read wrong when I read that the optimal BGP path gets installed in the IP routing table? Not talking about redistributing into other routing protocols, just appearing as BGP routes in the IP table. Why is that not happening?
From debug ip bgp udates on Sethtek-H; every 60 secs I get this:
02:43:42: BGP(0): no valid path for 18.104.22.168/24
G is doing the same, for the 208.208. network. If it thinks there's no valid path why is it allowing it in the BGP table?
I also wonder about the weight assigned to the received routes. This here Cisco website says that "Any path that a Cisco router originates will have a default weight of 32768; other paths have weight 0." Meaning that only local bgp routes have the 32768 weight, and received routes will be 0, even if those routes originated on a Cisco, if remote, router?
I can't quite shake my suspicion that Weight 0 is why these routes aren't being installed in the ip table.
Output from Sethtek-H's sh ip bgp command looks like this:
Sethtek-H#sh ip bgp
BGP table version is 3, local router ID is 22.214.171.124
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal
Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Weight Path
* i126.96.36.199 172.16.0.1 0 100 0 i
* i188.8.131.52 172.16.0.1 0 100 0 i
*> 184.108.40.206 0.0.0.0 0 32768 i
*> 220.127.116.11 0.0.0.0 0 32768 i
Nothing's really different on G's output, just the values switched where you'd expect.
Any insights anyone could offer would be greatly appreciated.