[130242] in North American Network Operators' Group
RE: BGP next-hop
daemon@ATHENA.MIT.EDU (Jeff Saxe)
Thu Sep 30 07:18:24 2010
From: Jeff Saxe <jsaxe@briworks.com>
To: "nanog@nanog.org" <nanog@nanog.org>
Date: Thu, 30 Sep 2010 04:13:51 -0700
In-Reply-To: <AANLkTikhi_sq-EMu6Vbdy7Q8kkC9YmQcK887fy=gQS3a@mail.gmail.com>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
Yes, I believe the command is "show ip bgp rib-failure". This shows routes =
that are in the BGP table, theoretically eligible to be used as actual traf=
fic-forwarding routes, but are failing to be inserted into the Routing Info=
rmation Base (RIB) for one reason or another. I don't have a lab router han=
dy to lab it up, and of course on my normal production router it comes up e=
mpty (lists column headers, but no routes) because I don't have any edge ca=
ses on there right now. But I think this is what you want.
-- Jeff Saxe
Network Engineer, Blue Ridge InternetWorks
Charlottesville, VA
________________________________________
From: Heath Jones [hj1980@gmail.com]
Sent: Thursday, September 30, 2010 5:49 AM
To: nanog@nanog.org
Subject: BGP next-hop
Hi all,
Is there an easy way to see which iBGP routes are not being selected
due to next-hop not being in IGP?
Before and after IGP route added shown below, note both are marked as valid=
..
-- BEFORE IGP--
AS5000_LA#show ip bgp
BGP table version is 5, local router ID is 10.0.0.5
Status codes: s suppressed, d damped, h history, * valid, > best, i - inter=
nal,
r RIB-failure, S Stale
Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Weight Path
* i100.10.0.0/16 10.0.0.10 0 100 0 2000 3000 ?
*> 10.0.0.6 0 1000 3000 3000=
?
-- AFTER IGP--
AS5000_LA#show ip bgp
BGP table version is 6, local router ID is 10.0.0.5
Status codes: s suppressed, d damped, h history, * valid, > best, i - inter=
nal,
r RIB-failure, S Stale
Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Weight Path
*>i100.10.0.0/16 10.0.0.10 0 100 0 2000 3000 ?
* 10.0.0.6 0 1000 3000 3000=
?
Cheers
Heath
ps. I've posted this to cisco-nsp also (a day ago) - so apologies in
advance if you are on both and seeing it twice.
