VPN on MPLS-OSPF

[Frederic Husser]

Hi,

I'm a student in network and have to do a certain topology that offers VPN services :

The purpose of the project is to use MPLS on OSPF to offer VPN services. Routing between differents networks of a same VPN can be made by any IGP routing protocol, like OSPF, RIP or IS-IS.

So, we learned how to use MPLS on OSPF, and OSPF with BGP. But we never learned how to make a level 3 VPN access.

I tried to do this : http://www.cisco.com/c/en/us/support/docs/multiprotocol-label-switching-mpls/mpls/13733-mpls-vpn-basic.html by replacing IS-IS, but this didn't work.

I think what I need more is something like this : http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/mp_l3_vpns/configuration/xe-3s/mp-l3-vpns-xe-3s-book/mp-vpn-ospf-pe-ce-support.html

What I'm asking now is, what is the type of configurations of the three composants of a MPLS VPN topology (I'm working on c7200 routers on gns3) :

How do I configure PEs ?

Does CEs just are loopbacks of PEs ?

What kind of configuration is on Ps routers ?

Thanks in advance !

[Bilal Nawaz]

The PE's are the routers that "do the hard work" when it comes to MPLS VPN. The only configuration required of the P routers is supporting LDP (mpls ip) and routes/"switches" through the network to get to P's and PE's.

The PE's "carry traffic / routes" from A to B with the help of BGP using vpnv4 address family. It also has a VRF facing the customer in order to receive the traffic / routes, this can be static routing or dynamic routing.

I won't go through the config, but I will provide you with a really good link below, which I followed when I was learning how to configure basic mpls-vpn - watch the video's on the link and try his lab one or two times, it will really help

http://gns3vault.com/mpls/basic-mpls-vpn/

hth

Bilal