Cisco 3750G Configuration Guide - Page 993

Chapter 40 Configuring IP Multicast Routing Configuring IP Multicast Routing Configuring PIMv2 BSR These sections describe how to set up BSR in your PIMv2 network: • Defining the PIM Domain Border, page 40-19 (optional) • Defining the IP Multicast Boundary, page 40-20 (optional) • Configuring Candidate BSRs, page 40-21 (optional) • Configuring Candidate RPs, page 40-22 (optional) For overview information, see the "Bootstrap Router" section on page 40-5. 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 40-3. Return to privileged EXEC mode. Verify your entries. (Optional) Save your entries in the configuration file. To remove the PIM border, use the no ip pim bsr-border interface configuration command. OL-8550-02 Catalyst 3750 Switch Software Configuration Guide 40-19