Cisco Catalyst 3750-E Software Configuration Manual page 1194

Configuring IP Multicast Routing
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For overview information, see the
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.
Command
Step 1 configure terminal
Step 2 interface interface-id
Step 3 ip pim bsr-border
Step 4 end
Step 5
show running-config
Step 6 copy running-config startup-config
To remove the PIM border, use the no ip pim bsr-border interface configuration command.
Figure 46-5
Configure the
ip pim bsr-border
command on
this interface.
Neighboring
PIMv2 domain
Catalyst 3750-E and 3560-E Switch Software Configuration Guide
46-30
Configuring Candidate RPs, page 46-32
Constraining PIMv2 BSR Messages
Layer 3
switch
(optional)
"Bootstrap Router" section on page
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
Return to privileged EXEC mode.
Verify your entries.
(Optional) Save your entries in the configuration file.
PIMv2 sparse-mode
network
BSR
messages messages
BSR
Chapter 46 Configuring IP Multicast Routing
46-7.
Configure the
ip pim bsr-border
command on
BSR
this interface.
Layer 3
PIMv2 domain
switch
Figure 46-5.
Neighboring
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