Configuration Exercises

1 What global Cisco IOS Software command is required to enable IP multicast routing?

2 Show the commands that enable PIM on an interface in dense mode, sparse mode, and sparse-dense mode.

3 Show the command to statically specify an RP with an address of 172.18.20.4.

4 Write the configuration statements necessary to statically map groups 239.1.2.3 and 228.1.8.0 through 228.1.8.255 to RP 192.168.15.5, and group 239.6.7.8 to RP 192.168.20.10. Map all other groups to RP 192.168.25.1.

5 All router interfaces shown in Figure 6-11 are running in sparse-dense mode. Show the relevant configurations in order for R1 to be the RP for only groups whose addresses begin with 226.13.0.0/24. R2 should only be the RP for groups whose addresses begin with 239.0.0.0/8. R3 is the mapping agent; ensure that the mapping agent will recognize only R1 and R2 as RPs, and only for the specified groups. All Auto-RP messages should have a TTL of 20.

Figure 6-11 The Topology for Configuration Exercises 5-8

R1 R4

Figure 6-11 The Topology for Configuration Exercises 5-8

R1 R4

R5 R2

R5 R2

6 Given the configurations of Configuration Exercise 5, suppose a source originates traffic for group 228.23.14.135, and a member requests a join to that group. What will happen?

Again referring to Figure 6-11, write the necessary configurations to enable the bootstrap protocol, making R1 and R2 C-RPs for the same group addresses described in Configuration Exercise 5. Make R3 the BSR, and make R4 a backup BSR.

8 Write configurations for the topology in Figure 6-11 that allow multicast load balancing between source 172.16.1.75 and group member 172.16.2.100. Use unnumbered addressing on the tunnel interfaces, referencing E0, and assume the IGP is advertising those addresses.

9 Examine the configurations of Homburg and Porkpie shown in the case study

"Multicast Load Sharing." Each router is running OSPF in passive mode on the tunnel interfaces. Why?

10 What is the purpose of the command ip pim spt-threshold 100 group-list 25?

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