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IBGP issue

 
 
mprasad079 mprasad079 is offline
Junior Member
Join Date: Dec 2012
Posts: 12
 
      12-23-2012
Hi All

I have topology, R1-R2 and R3 and R4 and R5 -R6 is in IBGP.
R1-R3, R3-R5 R2-R4 R4-R5 R4-R8 and R3-R7 are in EBGP.

R8 Conf

R8#sh run | s bgp
router bgp 8
no synchronization
bgp log-neighbor-changes
network 10.0.1.0 mask 255.255.255.0
network 10.0.2.0 mask 255.255.255.0
network 10.0.3.0 mask 255.255.255.0
network 10.0.4.0 mask 255.255.255.0
network 10.0.5.0 mask 255.255.255.0
network 10.0.6.0 mask 255.255.255.0
network 172.16.48.0 mask 255.255.255.224
neighbor 172.16.48.4 remote-as 34
no auto-summary


R4 gets all loopback IP's and also adver to its neighbor R3, which is in iBGP but R3 does not show any best path to loopback IP's of R8.

R3>sh ip bgp
BGP table version is 4, local router ID is 172.16.37.3
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal,
r RIB-failure, S Stale
Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Weight Path
*> 10.0.0.0/24 172.16.37.7 0 0 7 i
* i10.0.1.0/24 172.16.48.8 0 100 0 8 i
* i10.0.2.0/24 172.16.48.8 0 100 0 8 i
* i10.0.3.0/24 172.16.48.8 0 100 0 8 i
* i10.0.4.0/24 172.16.48.8 0 100 0 8 i
* i10.0.5.0/24 172.16.48.8 0 100 0 8 i
* i10.0.6.0/24 172.16.48.8 0 100 0 8 i
r> 172.16.37.0/27 172.16.37.7 0 0 7 i
* i172.16.48.0/27 172.16.48.8 0 100 0 8 i
R3>

Please let me know what is blocking? Normal scenario, routes learn from EBGP get adver to IBGP peer and reachable. But in this I am not getting any best path.

R3>sh ip bgp 10.0.1.0
BGP routing table entry for 10.0.1.0/24, version 0
Paths: (1 available, no best path)
Not advertised to any peer
8
172.16.48.8 (inaccessible) from 172.16.34.4 (172.16.48.4)
Origin IGP, metric 0, localpref 100, valid, internal
R3>
 

Last edited by mprasad079; 12-23-2012 at 07:50 AM..
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