04-13-2015 06:44 AM - edited 03-05-2019 01:13 AM
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.
04-17-2015 09:47 AM
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.
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