BGP route not selected as best path

From: Bradford Hung (bradford.hung@gmail.com)
Date: Wed Jan 23 2008 - 01:10:32 ARST


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

Thx



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