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• Determine the interval between state-refresh messages.
• Determine the minimum time to wait before receiving a new refresh message.
• Determine the TTL value of state-refresh messages.
• Determine the graft retry period.
Enabling PIM-DM
With PIM-DM enabled, a router sends hello messages periodically to discover PIM neighbors and
processes messages from the PIM neighbors. When you deploy a PIM-DM domain, enable PIM-DM on
all non-border interfaces of the routers.
IMPORTANT:
• All the interfaces on the same device must operate in the same PIM mode.
• PIM-DM does not work with multicast groups in the SSM group range.
Ste
Command Remarks
1. Enter system view.
system-view N/A
2. Enable IP multicast routing.
multicast routing-enable Disabled by default.
3. Enter interface view.
interface interface-type
interface-number
N/A
4. Enable PIM-DM.
pim dm Disabled by default.
For more information about the multicast routing-enable command, see IP Multicast Command
Reference.
Enabling state-refresh capability
Pruned interfaces resume multicast forwarding when the pruned state times out. To prevent this, the router
with the multicast source attached periodically sends an (S, G) state-refresh message, which is forwarded
hop by hop along the initial multicast flooding path of the PIM-DM domain, to refresh the prune timer
state of all the routers on the path. A multi-access subnet can have the state-refresh capability only if the
state-refresh capability is enabled on all PIM routers on the subnet.
To enable the state-refresh capability:
Ste
Command Remarks
1. Enter system view.
system-view N/A
2. Enter interface view.
interface interface-type
interface-number
N/A
3. Enable the state-refresh
capability.
pim state-refresh-capable
Optional
Enabled by default
Configuring state-refresh parameters
The router directly connected with the multicast source periodically sends state-refresh messages. You can
configure the interval for sending such messages.
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