This chapter covers the following topics:
The Central Multicast Problem—Describes the key issue with multicasting—identifying sources.
Routing Multicast Traffic—Describes multicast routing protocols.
Enabling PIM Sparse-Dense Mode—Describes the commands necessary to implement multicasting.
When configuring multicast routing, the trick is not remembering a large set of commands, but understanding how those simple commands and your environment are supported by the router. The first section of this chapter deals with finding the multicast server. The second section describes how multicast routing and routing protocols work, and the third section covers the required commands to create an IP multicast network.
The purpose of the "Do I Know This Already?" quiz is to help you to decide what parts of this chapter to use. If you already intend to read the entire chapter, you do not necessarily need to answer these questions now.
The 14-question quiz, derived from the major sections in the "Foundation Topics" portion of the chapter, helps you determine how to spend your limited study time.
Table 19-1 outlines the major topics discussed in this chapter and the "Do I Know This Already?"quiz questions that correspond to those topics.
|Foundation Topics Section||Questions Covered in This Section||Score|
|The Central Multicast Problem||1|
|Routing Multicast Traffic||2–8|
|Enabling PIM Sparse-Dense Mode||9–14|
The goal of self-assessment is to gauge your mastery of the topics in this chapter. If you do not know the answer to a question or are only partially sure of the answer, you should mark this question wrong for purposes of the self-assessment. Giving yourself credit for an answer you correctly guess skews your self-assessment results and might provide you with a false sense of security.
|1.||What common engineering problem must be solved by all multicast implementations?
|2.||Which of the following multicast routing protocols is fully supported on Cisco routers?
|3.||If a multicast group has recipients on every subnet, which of the PIM modes should be used?
|4.||Which type of tree structure is built for sparse-mode multicast routing?
|5.||What router maintains the RP-to-group correlation for Auto-RP in PIMv1?
|6.||Rendezvous points are configured with an access list. What is the purpose of this list?
|7.||What router advertises candidate RP routers in PIMv2?
|8.||TTL is used by multicast for what purpose?
|9.||Which command is used to enable multicast routing on an IOS device?
|10.||Which command enables a multicast routing protocol on an IOS device?
|11.||Which command causes an IOS device to volunteer itself as an RP?
|12.||Which command displays the multicast IP routing table?
|13.||Which command displays information about rendezvous points?
|14.||Which command utilizes the unicast IP routing table to calculate the interface on which traffic from a source should arrive?
The answers to the "Do I Know This Already?" quiz are found in Appendix A, "Answers to Chapter 'Do I Know This Already?' Quizzes and Q&A Sections." The suggested choices for your next step are as follows: