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durghamj7
Beginner

BGP Tunnel over MPLS

Dear Engineers

I have a problem setting up a GNS lab for the BGP tunnel over MPLS . I attached the topology and the config files so you can understand the issue .

The used IGP is IS-IS on R2,3 & 4 .

MPLS is applied on R2,3 & 4 .

BGP is applied on CE's and PE's (R1,2,4,5)

 

I am using  7200 Software (C7200-ADVENTERPRISEK9-M), Version 12.4(24)T for all routers CE , P , PE's . Also I tried 3k an 3K router with the same output .

 

Below is the bgp output of PE2 (R4) :

PE2# sh ip bgp
BGP table version is 6, local router ID is 4.4.4.4
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
*>i1.1.1.1/32       2.2.2.2                  0    100      0 2 i
r>i2.2.2.2/32       2.2.2.2                  0    100      0 i
*> 4.4.4.4/32       0.0.0.0                  0         32768 i
*> 5.5.5.5/32       10.4.5.2                 0             0 1 i

 

Same for the PE1 (R2) :

PE1#sh ip bgp
BGP table version is 6, 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 2 i
*> 2.2.2.2/32       0.0.0.0                  0         32768 i
r>i4.4.4.4/32       4.4.4.4                  0    100      0 i
*>i5.5.5.5/32       4.4.4.4                  0    100      0 1 i

 So router R4 can't choose a path to R2 and vice versa .

 

Thanks .

1 REPLY 1
jmattbullen
Beginner

you are getting the RIB-failure error because the 2.2.2.2 and 4.4.4.4 routes are also being carried by ISIS and it has a better administrative distance than ibgp so the ISIS route gets installed in the routing table.

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