IBGP issue

Discussion in 'Cisco' started by mprasad079, Dec 23, 2012.

  1. mprasad079

    mprasad079

    Joined:
    Dec 23, 2012
    Messages:
    12
    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: Dec 23, 2012
    mprasad079, Dec 23, 2012
    #1
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