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Chapter 36
Configuring IP Multicast Routing
To remove the PIM border, use the no ip pim bsr-border interface configuration command.
Figure 36-3 Constraining PIMv2 BSR Messages
Configure the
ip pim bsr-border
command on
this interface.
Neighboring
PIMv2 domain
Defining the IP Multicast Boundary
You define a multicast boundary to prevent Auto-RP messages from entering the PIM domain. You
create an access list to deny packets destined for 224.0.1.39 and 224.0.1.40, which carry Auto-RP
information.
Beginning in privileged EXEC mode, follow these steps to define a multicast boundary. This procedure
is optional.
Command
Step 1
configure terminal
Step 2
access-list access-list-number deny
source [source-wildcard]
Step 3
interface interface-id
Step 4
ip multicast boundary
access-list-number
Step 5
end
Step 6
show running-config
Step 7
copy running-config startup-config
78-16180-02
PIMv2 sparse-mode
network
BSR
messages
Layer 3
BSR
switch
Purpose
Enter global configuration mode.
Create a standard access list, repeating the command as many times as
necessary.
•
For access-list-number, the range is 1 to 99.
•
The deny keyword denies access if the conditions are matched.
For source, enter multicast addresses 224.0.1.39 and 224.0.1.40,
•
which carry Auto-RP information.
(Optional) For source-wildcard, enter the wildcard bits in dotted
•
decimal notation to be applied to the source. Place ones in the bit
positions that you want to ignore.
Recall that the access list is always terminated by an implicit deny
statement for everything.
Specify the interface to be configured, and enter interface configuration
mode.
Configure the boundary, specifying the access list you created in Step 2.
Return to privileged EXEC mode.
Verify your entries.
(Optional) Save your entries in the configuration file.
Configuring IP Multicast Routing
BSR
messages
Layer 3
switch
Catalyst 3750 Switch Software Configuration Guide
Configure the
ip pim bsr-border
command on
this interface.
Neighboring
PIMv2 domain
36-19
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