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MPLS Fundamentals by Luc De Ghein - CCIE No. 1897

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Chapter 13. Troubleshooting MPLS Networks

What You Will Learn

By the end of this chapter, you should know and be able to do the following:

  • Know how many labels to expect on a packet at a particular link in any MPLS network

  • Use the traceroute tool in Cisco IOS to help determine problems with the forwarding of MPLS packets

  • Solve a typical MPLS MTU problem

  • Explain the propagation of the Time To Live (TTL) value by labeled packets

  • Tackle a problem with load balancing labeled packets

  • Explain what the command mpls ip propagate-ttl does and what its typical use is

  • Use MPLS-aware Netflow to better troubleshoot MPLS forwarding problems

When you are able to do these, you are ready to troubleshoot MPLS problems in a proper and efficient manner.

To troubleshoot ...

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