Understanding BGP output Help.

Unanswered Question
Jan 16th, 2008
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Hi


Just hoping someone can help me to understand the following output:


sh ip bgp 212.x.x.5

BGP routing table entry for 212.x.x.4/30, version 7

Paths: (1 available, best #1, table Default-IP-Routing-Table)

Advertised to non peer-group peers:

212.y.y.1

Local

0.0.0.0 from 0.0.0.0 (212.y.y.2)

Origin IGP, metric 0, localpref 100, weight 32768, valid, sourced, local, best


What does the "0.0.0.0 from 0.0.0.0 (212.y.y.2)" mean? and why is it saying "Advertised to non peer-group peers:"?


Thanks for any help.


Dan

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Istvan_Rabai Thu, 01/17/2008 - 19:12
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Hi Dan,


0.0.0.0 from 0.0.0.0 means the source of the given route is the local router: you (or someone)configured a 'network 212.x.x.4 mask 255.255.255.252" command under the BGP process.


For routes originated by the local router the default weight is 32768 (see your config).


212.y.y.2 is your local router.


For the second question I don't know the exact answer, but in your place I would try what the same output would be if I put neighbor 212.y.y.1 into a peer-group, like this:


Let's say we define a peer-group name "ttt".

remote AS=65000


neighbor ttt peer-group (defines peer-group)

neighbor 212.y.y.1 peer-group ttt (puts 212.y.y.1 into peer-group ttt)

neighbor ttt remote-as 65000 (defines neighbor relationship using peer-group ttt).


After the neighbor relationship is established, use the sh ip bgp 212.x.x.5 command again. What is the result?


I will definitely try it because it is interesting for me as well.


Best regards:

Istvan


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