Command Line Interface
1156 1553-KDU 137 365 Uen D 2006-06-16
Command Mode
Interface Configuration (VLAN)
Command Usage
• More than one PIM-SM router may be connected an Ethernet or other
shared-media LAN. If multicast hosts are directly connected to the LAN,
then only one of these routers is elected as the DR, and acts on behalf
of these hosts, sending periodic Join/Prune messages toward a group-
specific RP for each group. A single DR is elected per interface (LAN or
otherwise) using a simple election process.
• The router with the highest priority configured on an interface is elected
as the DR. If more than one router attached to this interface uses the
same priority, then the router with the highest IP address is elected to
serve as the DR.
• If a router does not advertise a priority in its hello messages, it is
assumed to have the highest priority and is elected as the DR. If more
than one router is not advertising its priority, then the router with the
highest IP address is elected to server as the DR.
Example
This example enables PIM-SM on VLAN 1.
Related Commands
show ip pim interface (section 7.27.26 on page 1131)
Console(config)#interface vlan 1
Console(config-if)#ip pim dr-priority 20
Console#show ip pim interface 1
Vlan 1 is up
PIM is enabled, mode is Sparse.
Internet address is 192.168.1.250.
Hello time interval is 30 sec, trigger hello time interval is 5 sec.
Hello holdtime is 105 sec.
DR priority is 20.
DR Internet address is 0.0.0.0, neighbor count is 0.
Console#
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