User's Manual

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mode.
To forbid a switch or switches at a network segment to join in the PIM-DM negotiation, the neighbor filtration
list need be configured. To forbid or permit some groups to pass the local region, the multicast boundary
filtration list need be configured.
Command Purpose
ip pim-dm neighor-filter
Configures the neighbor filtration list.
ip multicast boundary
Configures the multicast boundary filtration
list.
74.2.5 Setting DR Priority
To be compatible with IGMP v1, the DR choice is required. By default, the priority of the DR is set to 1. When
all PIM neighboring routers on the interface support DR Priority, the neighboring router with higher priority is
selected as the DR. If the priority is the same, the neighboring router with the maximum interface IP value is
selected as the DR. If the priority is not shown in the Hello message of multiple routers, the router whose
interface has the biggest IP value is selected as the DR.
Run the following command in interface configuration mode:
Command Purpose
ip pim-dm dr-priority
Configures the priority for the local DR on the
designated port.
74.2.6 Clearing Item (S,G)
Normally, item (S,G) in the local MRT or the statistics value of the multicast message number forwarded
through item (S,G) need be cleared. Run the following commands in management mode.
Command Purpose
clear ip mroute pim-dm
{
*
| group [source]} Clears the item (S,G) in the local MRT.
The operation is to delete all or part items of
the local multicast routing table. Multicast
message forwarding may be affected. The
command is used to delete only the (S,G)
items created by the PIM-DM multicast
routing protocol on the upstream ports.
clear ip pim-dm interface
Resets the statistics value of multicast
message forwarded by (S,G) on the PIM-DM
port. The command is used to reset only the
(S,G) items created by the PIM-DM multicast
routing protocol on the upstream ports.
74.3 PIM-DM State-Refresh Configuration Example
Refer to section 4.2.2 “Configuring State-Refresh”.