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Cisco ASDM User Guide
OL-16647-01
Chapter 12 Configuring Multicast Routing
PIM
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 security appliance should join shortest-path tree or use shared tree, either
for all multicast groups or only for specific multicast addresses.
Fields
• Use Shortest Path Tree for All Groups—Choose this option to use shortest-path tree for all multicast
groups.
• Use Shared Tree for All Groups—Choose this option to use shared tree for all multicast groups.
• Use Shared Tree for the Groups specified below—Choose this option to use 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.
• Multicast Groups—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.
Double-click an entry to open the Multicast Group dialog box for the selected entry.
–
Action—Displays “Permit” if the multicast group is included or “deny” if the multicast group
is excluded.
–
Multicast Group Address—Displays the address of the multicast group.
–
Netmask—Displays the network mask of the multicast group address.
• Insert Before—Opens the Multicast Group dialog box. Use this button to add a new multicast group
entry before the selected entry in the table.
• Insert After—Opens the Multicast Group dialog box. Use this button to add a new multicast group
entry after the selected entry in the table.
• Add—Opens the Multicast Group dialog box. Use this button to add a new multicast group entry at
the bottom of the table.
• Edit—Opens the Multicast Group dialog box. Use this button to change the information for the
selected multicast group entry.
• Delete—Removes the selected multicast group entry from the table.
Modes
The following table shows the modes in which this feature is available:
Firewall Mode Security Context
Routed Transparent Single
Multiple
Context System
• — • ——