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MPLS inside GRE

ubsaccount
Level 1
Level 1

This is my lab.  I configured OSPF for ISP and ran static route from Customer to ISP.  I built a GRE tunnel from Customer 1 to Customer 2. After building the tunnel I am trying to run site to site MPLS.  The LDP neighbors never come up.  I am not running MPLS through the ISP. 

Can anyone tell me what I'm doing wrong?


R1
Customer 1

mpls label range 100 199
mpls label protocol ldp
multilink bundle-name authenticated

interface Loopback0
ip address 10.10.10.10 255.255.255.255
!
interface Tunnel0
ip address 192.168.1.1 255.255.255.0
mpls ip
tunnel source Ethernet1/0
tunnel destination 4.4.4.2

interface Ethernet1/0
ip address 1.1.1.1 255.255.255.252
duplex full

ip route 0.0.0.0 0.0.0.0 1.1.1.2

mpls ldp router-id Loopback0

R2


interface Ethernet1/0
ip address 1.1.1.2 255.255.255.252
ip ospf 1 area 0
duplex full
!
interface Ethernet1/1
ip address 2.2.2.1 255.255.255.252
ip ospf 1 area 0
duplex full

router ospf 1
redistribute static subnets

ip route 1.1.1.0 255.255.255.252 1.1.1.1

R4
!
interface Ethernet1/0
ip address 4.4.4.1 255.255.255.252
ip ospf 1 area 0
duplex full

interface Ethernet1/2
ip address 3.3.3.2 255.255.255.252
ip ospf 1 area 0
duplex full

router ospf 1
redistribute static

ip route 4.4.4.0 255.255.255.252 4.4.4.2
!


R5
Customer 2

mpls label range 500 599
mpls label protocol ldp

interface Loopback0
ip address 50.50.50.50 255.255.255.255
!
interface Tunnel1
ip address 192.168.1.2 255.255.255.0
mpls ip
tunnel source Ethernet1/0
tunnel destination 1.1.1.1

interface Ethernet1/0
ip address 4.4.4.2 255.255.255.252
duplex full

no ip http server
no ip http secure-server
ip route 0.0.0.0 0.0.0.0 4.4.4.1

!
mpls ldp router-id Loopback0

1 Accepted Solution

Accepted Solutions

willwetherman
Spotlight
Spotlight

Hi

By default LDP will try and establish a TCP adjacency with the discovered neighbors highest loopback IP address. If the loopback IP address is unreachable then the adjacency will fail.

Can you reach 50.50.50.50 from 10.10.10.10 over the GRE tunnel? If not you will need to add static routes to R1 and R5 to reach the loopback interfaces over Tunnel1.

View solution in original post

3 Replies 3

willwetherman
Spotlight
Spotlight

Hi

By default LDP will try and establish a TCP adjacency with the discovered neighbors highest loopback IP address. If the loopback IP address is unreachable then the adjacency will fail.

Can you reach 50.50.50.50 from 10.10.10.10 over the GRE tunnel? If not you will need to add static routes to R1 and R5 to reach the loopback interfaces over Tunnel1.

BAM! THANK YOU!!! 

I configured EIGRP on both customer site and put the loop0 into the network statements and it all works now!

Thats not a problem.

Please mark the answer as correct and rate if it has helped you. This will allow others to find this solution if they have a similar issue.

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