Cisco ASA 5505 Configuration Manual page 463

Chapter 24 Configuring Multicast Routing
Click OK.
Step 8
Configuring PIM Message Intervals
Router query messages are used to select the PIM DR. The PIM DR is responsible for sending router
query messages. By default, router query messages are sent every 30 seconds. Additionally, every 60
seconds, the adaptive security appliance sends PIM join/prune messages.
To change these intervals, perform the following steps:
In the main ASDM window, choose Configuration > Device Setup > Routing > Multicast > PIM >
Step 1
Protocol.
Choose the interface you want to enable for PIM from the table on the Protocol pane, and click Edit.
Step 2
The Edit PIM Protocol dialog box appears.
In the Hello Interval field, type the frequency, in seconds, at which the interface sends PIM hello
Step 3
messages.
In the Prune Interval field, type the frequency, in seconds, at which the interface sends PIM join and
Step 4
prune advertisements.
Click OK.
Step 5
Configuring a Route Tree
By default, PIM leaf routers join the shortest-path tree immediately after the first packet arrives from a
new source. This reduces delay, but requires more memory than shared tree. You can configure whether
the adaptive security appliance should join shortest-path tree or use shared tree, either for all multicast
groups or only for specific multicast addresses.
To configure a PIM leaf router tree, perform the following steps:
In the main ASDM window, choose Configuration > Device Setup > Routing > Multicast > PIM >
Step 1
Route Tree.
Click one of the following radio buttons:
Step 2
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Use Shortest Path Tree for All Groups—Choose this option to use the shortest-path tree for all
multicast groups.
Use Shared Tree for All Groups—Choose this option to use the shared tree for all multicast groups.
Use Shared Tree for the Groups specified below—Choose this option to use the shared tree for
the groups specified in the Multicast Groups table. Shortest-path tree is used for any group not
specified in the Multicast Groups table.
The Multicast Groups table displays the multicast groups to use Shared Tree with.
The table entries are processed from the top down. You can create an entry that includes a range of
multicast groups but excludes specific groups within that range by placing deny rules for the specific
groups at the top of the table and the permit rule for the range of multicast groups below the deny
statements.
Cisco ASA 5500 Series Configuration Guide using ASDM
Customizing Multicast Routing
24-13