From: Derek (cciestudy@hkbsd.com)
Date: Wed Jan 23 2008 - 15:30:34 ARST
hi
Such paths are denied upon ingress into the router and are not even
installed in the BGP Routing Information Base (RIB). The same applies to any
path that is denied by a routing policy that is implemented via access,
prefix, AS_PATH, or community lists,the router has stored the paths because
you have configured soft-reconfiguration inbound for the neighbor that sends
the path.
HTH
Derek
CCIE#17538
----- Original Message -----
From: "Bradford Hung" <bradford.hung@gmail.com>
To: <ccielab@groupstudy.com>
Sent: Wednesday, January 23, 2008 12:09 PM
Subject: BGP route not selected as best path
> Hi,
>
>
> R7 is connected to R2 and BGP between running between them
>
> "133.1.118.0/24" and "133.1.119.0/24" are both received from R2, but no
> idea whay " 133.1.118.0/24" is not selected as best path. Please help to
> advise what is the problem.
>
>
> r7#sho ip bgp sum
> BGP router identifier 144.7.7.7 , local AS number 65002
> BGP table version is 12, main routing table version 12
> 13 network entries and 13 paths using 1729 bytes of memory
> 7 BGP path attribute entries using 540 bytes of memory
> 4 BGP AS-PATH entries using 96 bytes of memory
> 0 BGP route-map cache entries using 0 bytes of memory
> 0 BGP filter-list cache entries using 0 bytes of memory
> 2 received paths for inbound soft reconfiguration
> BGP activity 323/629 prefixes, 526/513 paths, scan interval 60 secs
>
> Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down
> State/PfxRcd
> 133.1.27.2 4 100 69894 69402 12 0 0 00:00:14
> 11
>
>
> r7#sho ip bgp neighbors 133.1.27.2 received-routes
> BGP table version is 12, local router ID is 144.7.7.7
> 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
> *> 133.0.0.0 133.1.27.2 0 100 65004 ?
> *> 133.1.0.0 133.1.27.2 0 100 65001 ?
> *> 133.1.16.0/24 133.1.27.2 0 100 ?
> *> 133.1.27.0/24 133.1.27.2 200 0 100 ?
> *> 133.1.48.0/24 133.1.27.2 0 100 ?
> *> 133.1.59.0/24 133.1.27.2 0 100 ?
> * 133.1.118.0/24 133.1.27.2 0 100 65004 i
> *> 133.1.119.0/24 133.1.27.2 0 100 65005 i
> *> 144.6.0.0 133.1.27.2 0 100 65001 ?
> * 144.6.6.6/32 133.1.27.2 0 100 65001 i
> *> 144.8.0.0 133.1.27.2 0 100 65004 ?
> *> 144.9.0.0 133.1.27.2 0 100 65004 ?
> *> 144.11.0.0 133.1.27.2 0 100 65004 ?
>
> Total number of prefixes 13
> r7#
> r7#
> r7#
> r7#sho ip bgp 133.1.118.0/24
> BGP routing table entry for 133.1.118.0/24, version 0
> Paths: (1 available, no best path)
> Not advertised to any peer
> 100 65004, (received-only)
> 133.1.27.2 from 133.1.27.2 (144.2.2.2)
> Origin IGP, localpref 100, valid, external
> r7#sho ip bgp 133.1.119.0/24
> BGP routing table entry for 133.1.119.0/24, version 8
> Paths: (1 available, best #1, table Default-IP-Routing-Table)
> Not advertised to any peer
> 100 65005, (received & used)
> 133.1.27.2 from 133.1.27.2 (144.2.2.2)
> Origin IGP, localpref 100, valid, external, best
> r7#sho ip route 133.1.27.2
> Routing entry for 133.1.27.0/24
> Known via "connected", distance 0, metric 0 (connected, via interface)
> Routing Descriptor Blocks:
> * directly connected, via FastEthernet0/0
> Route metric is 0, traffic share count is 1
>
>
> Thx
>
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