C
HAPTER
46
| Multicast Routing Commands
PIM Multicast Routing
– 1108 –
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.
EXAMPLE
This example sets the priority used in the bidding process for the DR.
Console(config)#interface vlan 1
Console(config-if)#ip pim dr-priority 20
Console(config-if)#end
Console#show ip pim interface
PIM is enabled.
Vlan 1 is up.
PIM Mode : Sparse Mode
IP Address : 192.168.0.2
Hello Interval : 30 sec
Hello HoldTime : 105 sec
Triggered Hello Delay : 5 sec
Join/Prune Holdtime : 210 sec
Lan Prune Delay : Disabled
Propagation Delay : 500 ms
Override Interval : 2500 ms
DR Priority : 20
Join/Prune Interval : 60 sec
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