R2

sh ip route

1.0.0.0/32 is subnetted, 1 subnets

O 1.1.1.1 [110/2] via 165.148.120.1, 00:58:28, ATM3/0.100

155.239.0.0/24 is subnetted, 1 subnets

C 155.239.247.0 is directly connected, FastEthernet0/2

155.1.0.0/24 is subnetted, 1 subnets

C 155.1.1.0 is directly connected, GigabitEthernet0/3

4.0.0.0/32 is subnetted, 1 subnets

C 4.4.4.4 is directly connected, Loopback0

C 192.11.1.0/24 is directly connected, GigabitEthernet0/1

165.148.0.0/30 is subnetted, 1 subnets

C 165.148.120.0 is directly connected, ATM3/0.100

R3

sh ip route

1.0.0.0/32 is subnetted, 1 subnets

C 1.1.1.1 is directly connected, Loopback0

155.239.0.0/24 is subnetted, 1 subnets

C 155.239.247.0 is directly connected, GigabitEthernet0/3

155.1.0.0/24 is subnetted, 1 subnets

C 155.1.1.0 is directly connected, GigabitEthernet0/2

3.0.0.0/32 is subnetted, 1 subnets

B 3.3.3.3 [20/0] via 165.148.121.2, 00:17:01

4.0.0.0/32 is subnetted, 1 subnets

O 4.4.4.4 [110/2] via 165.148.120.2, 01:01:53, ATM1/0.100

C 192.5.1.0/24 is directly connected, GigabitEthernet0/1

165.148.0.0/30 is subnetted, 2 subnets

C 165.148.121.0 is directly connected, Serial6/0

C 165.148.120.0 is directly connected, ATM1/0.100

the problem here is once I apply the ip vrf for command on th interface on the PE's, the CE's drops immediately..

I tried all of the above configs but i still can't get it right.

please confirm this for me, to run mpls do I need to have a P router, and PE's. I've configured only these two commands mpls ip, mpls label protocol ldp between the two routers (R2&R3) to create an mpls cloud so that i can configure my vrf's on the PE and CE.

Do I need to to have mpls configurations on the P router before I can generate traffic from one end to another making use of vrf?

Lawrence,

It should be fine to have "mpls ip" configured only between r2 and r3 if those are your PEs. You do not necessarily need P routers to get MPLS VPN working. Directly connected PEs will do just fine.

Regards

Lawrence

Have a look on the attached configs i had used to simulate when learning about MPLS .. There are no P routers in them

Hope it helps

Narayan

I will be trying the configs you gave me in three hours, I will provide feedback. I can't access my lab at this stage I don't know what happened. will be checking in the morning(in 4 hours from now).

I have tried your configs, my problem now is: I cannot activate the neighbor on address-family vpnv4 here is an error message "Specify remote-as or peer-group commands first".

another question is "is it a must to have three routers(PE)?

Can it work with my sketch(only four routers.

Yes it can... you can remove the RR in my design

"Cannot configure the local system as neighbor".

This means that you are trying to use using the routers own ip address instead of the peer neighbor command.. just chnage this to the other peer

Narayan

Lawrence,

As the message indicates, you are trying to activate using the address of the local end when you should be using the remote end as defined in global bgp mode.

As to your other question, you can run mpls vpn with only two PEs, no P router.

Regards

sorry my bad, you guys are correct but it's still giving me an errors message "Specify remote-as or peer-group commands first" when I try to activate the neighbor.

I am starting to suspect the ios. this router is using version 12.2(31)SB9, the other router is using version 12.4(21) and this one does accept this configs. i once tried to upgrade to the recent version but it's failing to boot from the latest..

I forgot to put it the remote-as.. thanks for your help but I am still proceeding with my configs not done yet.

Hello Lawrence,

on older IOS version you need to give

router bgp 100

no bgp default ipv4-unicast

this is to be able then to use the address-families

Hope to help

Giuseppe