Our network is now able to carry vpnv4 prefixes, so it’s now time to receive them from customers. As mentioned before vpnv4 prefix consist of route distinguisher (RD) and IPv4 prefix. But that’s not all. We have to have set of tools to differ one customer from another and control propagation of prefixes. Those tools are VRFs, RDs and RTs.
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Our core network after first chapter of workshop is able to forward labeled packets. Let’s focus now on deploying some services within this network. First MPLS L3VPN. As for now we have IS-IS as an IGP protocol in the core to forward prefixes of links and loopbacks, and LDP to maintain label exchange. Next step is to introduce mechanism that will allow us to attach label information to prefixes. MP-BGP is an extension of standard BGP protocol that let us carry MPLS VPN routes. It’s flexible and well known protocol. At this step we configure core routers (P and PE) to carry MPLS VPN routes.
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