Cisco ASA 5505 - Manual (Page 503)

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Cisco ASA 5500 Series Configuration Guide using the CLI
Chapter 26 Configuring Multicast Routing
Customizing Multicast Routing
Note The ASA always advertises the bidirectional capability in the PIM hello messages, regardless of the
actual bidirectional configuration.
Configuring the Designated Router Priority
The DR is responsible for sending PIM register, join, and prune messages to the RP. When there is more
than one multicast router on a network segment, selecting the DR is based on the DR priority. If multiple
devices have the same DR priority, then the device with the highest IP address becomes the DR.
By default, the ASA has a DR priority of 1. To change this value, enter the following command:
Configuring and Filtering PIM Register Messages
When the ASA is acting as an RP, you can restrict specific multicast sources from registering with it to
prevent unauthorized sources from registering with the RP. The Request Filter pane lets you define the
multicast sources from which the ASA will accept PIM register messages.
To filter PIM register messages, enter the following command:
Command Purpose
pim dr-priority num
Example:
hostname(config-if)# pim dr-priority 500
Changes the designated router priority.
The num argument can be any number ranging from 1 to 4294967294.
Command Purpose
pim accept-register {list acl | route-map
map-name}
Example:
hostname(config)# pim accept-register
{list acl1 | route-map map2}
Configures the ASA to filter PIM register messages.
In the example, the ASA filters PIM register messages acl1 and route map
map2.