Back in the BGP fray - why these errors?

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Aug 20th, 2008
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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; H's .2.

Each has three loopback interfaces configured (and declared in the BGP config). G has;; 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's that not happening.

Also, why is Sethtek-H's bgp updates debugging output saying


02:43:42: BGP(0): no valid path for

every 20 seconds? G's 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?

Thanks for ur help every1.

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Richard Burts Thu, 08/21/2008 - 11:38
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It might help if you would post the output of show ip bgp for one of these routes that is not appearing in the routing table.

The error message no valid path for means that there is something wrong with the advertised path. Frequently it means that the next hop address that is advertised is not reachable. So what address is being advertised as the next hop and is it reachable from this router?

Are you configuring update-source in the BGP of these routers, and if so what address is used as the source?




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