![]() I have not run BGP so as to not complicate the setup and as it is not required and also to show that MPLS does not require IPV4 BGP. All routers of Provider are running OSPF, LDP and MP BGP. Similarly it is EIGRP between CE2 and PE2. The PE-CE routing protocol between CE1 and PE1 is OSPF. The diagram is pretty self explanatory but I will still explain it. First is the logical diagram consisting of the various protocols running and the the other is the ip address diagram. I have represented the topology using 2 diagrams. As I had mentioned in my previous blog about the disadvantages of “Show Run”, so I would be concentrating on using debugs and show commands rather than show run for troubleshooting. It is expected that you know MPLS beforehand to make sense of it or at least have partial knowledge. In this post, I will not explain MPLS VPN but help develop a strategy to troubleshoot MPLS VPN. This teaching method even overwhelmed me, so I tore apart MPLS VPN to understand it better and if you see the concept first and then individual protocols, it might not seem that difficult. I have seen many guys teaching MPLS by jumping straight to configuration. This could stem from lack of knowledge on MPLS or the way many people teach MPLS. I have received International calls from many of my friends and colleagues who were overwhelmed by MPLS. Even if their project involves just an MPLS circuit between 2 locations, the word “MPLS” still scares them although there is not much difference between it and a layer 2 circuit. For an average person working in Computer Networks, MPLS seems to be a topic which seems to be most scary. In this post I will be talking about MPLS VPN. ![]() As I had promised in my post “Non-Technical Tips for CCIE Lab Troubleshooting”, I am back with a series on troubleshooting different networking technologies centering around CCIE Lab.
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