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Web – Click Routing Protocol, PIM-DM, General Settings. Enable or disable
PIM-DM globally for the router, and click Apply.
Figure 3-153 PIM-DM General Settings
CLI – This example enables PIM-DM globally and displays the current status.
Configuring PIM-DM Interface Settings
To fully enable PIM-DM, you need to enable multicast routing globally for the router
(page 3-261), enable PIM-DM globally for the router (page 3-272), and also enable
PIM-DM for each interface that will participate in multicast routing.
Command Usage
• PIM-DM functions similar to DVMRP by periodically flooding the network with traffic
from any active multicast server (page 3-265). It also uses IGMP to determine the
presence of multicast group members. The main difference, is that it uses the
router’s unicast routing table to determine if the interface through which a packet
is received provides the shortest path back to the source.
• 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.
• The interface settings that control the prune and graft messages (i.e., prune
holdtime) should be configured to the same values on all routers throughout the
network to allow PIM to function properly.
Command Attributes
• VLAN – Selects a VLAN interface on this router.
• PIM-DM Protocol Status – Enables/disables PIM-DM. (Default: Disabled)
• Hello Interval – Sets the frequency at which PIM hello messages are transmitted.
Hello messages are sent to neighboring PIM routers from which this device has
received probes, and are used to verify whether or not these neighbors are still
active members of the multicast tree. (Range: 1-65535 seconds; Default: 30)
• Hello Holdtime – Sets the interval to wait for hello messages from a neighboring
PIM router before declaring it dead. Note that the hello holdtime should be 3.5
times the value of Hello Interval. (Range: 1-65535 seconds; Default: 105)
Console(config)#router pim 4-310
Console#show router pim 4-315
Admin Status: Enabled
Console#