Chapter 30
| Multicast Routing Commands
PIM Multicast Routing
– 1042 –
receivers to the source will be maintained, even if the source is not sending
traffic for long periods of time, or has stopped sending altogether.
Example
This example sets the SSM address range to 224.2.151.0/24.
Console(config)#ip pim ssm range 224.2.151.0 255.255.255.0
Console#
ip pim dr-priority This command sets the priority value for a Designated Router (DR) candidate. Use
the no form to restore the default setting.
Syntax
ip pim dr-priority priority-value
no ip pim dr-priority
priority-value - Priority advertised by a router when bidding to become the
DR. (Range: 0-4294967294)
Default Setting
1
Command Mode
Interface Configuration (VLAN)
Command Usage
â—† More than one PIM-SM router may be connected to 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.
â—† 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.
â—† 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
serve as the DR.
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