Simple MPLS topology

[arkala anudeep]

I've been trying to configure a MPLS topology.

Point is R3 is the Provider router, where it is not required to have the routes to CE?

R1#show ip bgp
BGP table version is 11, local router ID is 1.1.1.1
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       0.0.0.0                  0         32768 i
*> 5.5.5.5/32       10.1.12.2                              0 200 300 i

=====

R2#show ip bgp
BGP table version is 7, 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       10.1.12.1                0             0 100 i
*>i5.5.5.5/32       4.4.4.4                  0    100      0 300

====

R3#show ip bgp
% BGP not active

===

R4#show ip bgp
BGP table version is 7, 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      0 100 i
*> 5.5.5.5/32       10.5.45.5                0             0 300 i

===

R5#show ip bgp
BGP table version is 11, local router ID is 5.5.5.5
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       10.5.45.4                              0 200 100 i
*> 5.5.5.5/32       0.0.0.0                  0         32768 i

====

R1#trace 5.5.5.5 source loopback 0 probe 1

Type escape sequence to abort.
Tracing the route to 5.5.5.5

  1 10.1.12.2 40 msec
  2  *
  3 10.0.34.4 76 msec
  4 10.5.45.5 124 msec

i've got LDP neighbor ship between R2-R3-R4, my question is why am I not able to see HOP 2, untill I do a full mesh connectivity, when I do so, R5 will receive the CE routes and there is no point of running MPLS.

R1-R2 -- EBGP

R2-R3-R4- LDP and OSPF

R2-R4- BGP

==

R4#show run | s r b
router bgp 200
 no synchronization
 bgp router-id 4.4.4.4
 bgp log-neighbor-changes
 neighbor 2.2.2.2 remote-as 200
 neighbor 2.2.2.2 update-source Loopback0
 neighbor 2.2.2.2 next-hop-self
 neighbor 10.5.45.5 remote-as 300
 no auto-summary

==

R4-R5-EBGP

Please help, i'm not able to get the logic here.

[Ruben Cocheno]

Hi,

Let´s clarify a few things here.

P - only run IGP and LDP neighborship

PE - LDP + BGP + LDP + VRF

CE - Local LAN

If you simulate a MPLS environment where you have L3VPN for a customer (resides in CE), you will need create a VRF (import+export targets) and attach it to the interface witch faces CE.

The MPLS network (IGP) will don´t know about CE routes.