Chapter Review Questions

1. How many bits in the IP header can be used for QoS?

2. How many AF classes exist?

3. Name the three MPLS DiffServ models.

4. What is the difference between the Pipe and Short Pipe models?

5. What is the interface command to encapsulate all IP packets with an explicit NULL label?

6. What is TOS reflection?

7. What feature is used in Cisco IOS to alter the EXP bits?

8. What is the problem with PHP and QoS?

9. What is the solution to the problem in question 8? 10. On which labels can you change the EXP bits value?

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.

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