Cisco 3560G 48TS Software Configuration Guide - Page 713

Chapter 32 Configuring IP Multicast Routing Configuring IP Multicast Routing This example shows a sample configuration on an Auto-RP mapping agent that is used to prevent candidate RP announcements from being accepted from unauthorized candidate RPs: Switch(config)# ip pim rp-announce-filter rp-list 10 group-list 20 Switch(config)# access-list 10 permit host 172.16.5.1 Switch(config)# access-list 10 permit host 172.16.2.1 Switch(config)# access-list 20 deny 239.0.0.0 0.0.255.255 Switch(config)# access-list 20 permit 224.0.0.0 15.255.255.255 In this example, the mapping agent accepts candidate RP announcements from only two devices, 172.16.5.1 and 172.16.2.1. The mapping agent accepts candidate RP announcements from these two devices only for multicast groups that fall in the group range of 224.0.0.0 to 239.255.255.255. The mapping agent does not accept candidate RP announcements from any other devices in the network. Furthermore, the mapping agent does not accept candidate RP announcements from 172.16.5.1 or 172.16.2.1 if the announcements are for any groups in the 239.0.0.0 through 239.255.255.255 range. This range is the administratively scoped address range. Configuring PIMv2 BSR These sections describe how to set up BSR in your PIMv2 network: • Defining the PIM Domain Border, page 32-17 (optional) • Defining the IP Multicast Boundary, page 32-18 (optional) • Configuring Candidate BSRs, page 32-19 (optional) • Configuring Candidate RPs, page 32-20 (optional) For overview information, see the "Bootstrap Router" section on page 32-5. Defining the PIM Domain Border As IP multicast becomes more widespread, the chance of one PIMv2 domain bordering another PIMv2 domain is increasing. Because these two domains probably do not share the same set of RPs, BSR, candidate RPs, and candidate BSRs, you need to constrain PIMv2 BSR messages from flowing into or out of the domain. Allowing these messages to leak across the domain borders could adversely affect the normal BSR election mechanism and elect a single BSR across all bordering domains and co-mingle candidate RP advertisements, resulting in the election of RPs in the wrong domain. Beginning in privileged EXEC mode, follow these steps to define the PIM domain border. This procedure is optional. Step 1 Step 2 Command configure terminal interface interface-id Step 3 ip pim bsr-border Step 4 Step 5 Step 6 end show running-config copy running-config startup-config Purpose Enter global configuration mode. Specify the interface to be configured, and enter interface configuration mode. Define a PIM bootstrap message boundary for the PIM domain. Enter this command on each interface that connects to other bordering PIM domains. This command instructs the switch to neither send or receive PIMv2 BSR messages on this interface as shown in Figure 32-3. Return to privileged EXEC mode. Verify your entries. (Optional) Save your entries in the configuration file. 78-16156-01 Catalyst 3560 Switch Software Configuration Guide 32-17