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Multicast Routing Commands
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ip pim dense-mode
This command enables PIM-DM on the specified interface. Use the no form to
disable PIM-DM on this interface.
Syntax
[no] ip pim dense-mode
Default Setting
Disabled
Command Mode
Interface Configuration (VLAN)
Command Usage
• To fully enable PIM-DM, you need to enable multicast routing globally for the
router with the ip multicast-routing command (page 4-297), enable PIM-DM
globally for the router with the router pim command (page 4-308), and also
enable PIM-DM for each interface that will participate in multicast routing with
the ip pim dense-mode command.
• If you enable PIM on an interface, you should also enable IGMP on that
interface.
• Dense-mode interfaces are subject to multicast flooding by default, and are
only removed from the multicast routing table when the router determines that
there are no group members or downstream routers, or when a prune
message is received from a downstream router.
Example
Console(config)#interface vlan 1
Console(config-if)#ip pim dense-mode
Console#show ip pim interface
Vlan 1 is up
PIM is enabled, mode is Dense.
Internet address is 10.1.0.253.
Hello time interval is 30 sec, trigger hello time interval is 5 sec.
Hello holdtime is 105 sec.
Join/Prune holdtime is 210 sec.
Graft retry interval is 3 sec, max graft retries is 2.
DR Internet address is 10.1.0.253, neighbor count is 0.
Console#