This post is the continuation of the previous post I made on Basic MPLS. In this post, I will talk about the different steps in order to configure MPLS Layer 3 VPNs which include the PE-CE routing protocols configuration with RIP, EIGRP and OSPF. I will also talk about the different loop prevention rules used when using OSPF as a PE-CE routing protocol. Finally I will conclude this post by talking about OSPF Sham-link.
In this topic, I will use the following topology:
Platform/IOS: Cisco 2691/12.4(15)T11 Adv IP services
- Customer A: VRF A | IGP: RIP
- Customer B: VRF B | IGP: EIGRP
- Customer C: VRF C | IGP: OSPF 2 Area 0
- ISP: Core IGP: OSPF 1 Area 0 | MP-BGP AS 200
Addressing: See topology. All the routers are configured with a Loopback IP and the format X.X.X.X /32 where X is the router number.