Mpls with Ebgp and iBgp

Hello,

have configured Ebgp between R1 and R2 with AS1 

and Ebgp between R6 and R7 with As2, I Bgp between R2 and R6 with As100



also have activated mpls on all interfaces of core (ISP) with IGP ospf 

 

Here are details of BGP on R2 and R6 ie Pe's routes



BGP on R2


R2#sho run | s router bgp

router bgp 100

 no synchronization

 bgp log-neighbor-changes

 neighbor 6.6.6.6 remote-as 100

 neighbor 6.6.6.6 update-source Loopback0

 neighbor 6.6.6.6 next-hop-self

 neighbor 10.1.2.1 remote-as 1

 no auto-summary



BGP on R6


R6#show run | s router bgp

router bgp 100

 no synchronization

 bgp log-neighbor-changes

 neighbor 2.2.2.2 remote-as 100

 neighbor 2.2.2.2 update-source Loopback0

 neighbor 2.2.2.2 next-hop-self

 neighbor 10.1.19.7 remote-as 2

 no auto-summary


R2#show ip bgp

BGP table version is 3, local router ID is 2.2.2.2

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

*> 1.1.1.1/32       10.1.2.1                 0             0 1 i

*>i7.7.7.7/32       6.6.6.6                  0    100      0 2 i



   Network          Next Hop            Metric LocPrf Weight Path

*>i1.1.1.1/32       2.2.2.2                  0    100      0 1 i

*> 7.7.7.7/32       10.1.19.7                0             0 2 i




Output from R2 Traceroute



R2#traceroute 7.7.7.7


Type escape sequence to abort.

Tracing the route to 7.7.7.7


  1 20.2.3.3 [MPLS: Label 16 Exp 0] 124 msec 108 msec 84 msec

  2 20.2.4.4 [MPLS: Label 16 Exp 0] 80 msec 88 msec 112 msec

  3 20.2.5.5 [MPLS: Label 16 Exp 0] 72 msec 76 msec 52 msec

  4 20.2.6.6 76 msec 120 msec 92 msec

  5  *  *  *

  6  *  *  *

  7  *  *  *

  8  *  *  *



for some reason it wont go throuth any help on this will be appricated


Linke for my topology



Comments

  • Check you did advertise all the loopbacks in your IGP and that they are MPLS enabled. IF you did this check the router-id for MPLS. It must be the Loopback you are using.

    I did not quite understand your design but remember that BGP works mostly on next hop value. Worth to check it!! eBGP will always win over iBGP :)

     

    Alessio

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