Configuring Interface Priority to Become the PIM Designated Router

By default, every PIM interface has the lowest probability (priority 0) of being selected as the DR. Configuring the interface DR priority helps ensure that changing an IP address does not alter your forwarding model.

To configure the interface DR priority:

1. Configure the interface globally or in the routing instance. This example shows the configuration for the routing instance.
   [edit]user@host# edit routing-instances PIM.master protocols pim interface ge-0/0/0.0user@host# set priority 5
2. Verify the configuration by checking the Hello Option DR Priority field in the output of the show pim neighbors detail command.
   user@host> show pim neighbors detail

   Instance: PIM.master
   Interface: ge-0/0/0.0
   Address: 192.168.195.37, IPv4, PIM v2, Mode: Sparse
   Hello Option Holdtime: 65535 seconds
   Hello Option DR Priority: 5
   Hello Option LAN Prune Delay: delay 500 ms override 2000 ms
   Join Suppression supported
   Rx Join: Group Source Timeout
   225.1.1.1 192.168.195.78 0
   225.1.1.1 0
   
   Interface: lo0.0
   Address: 10.255.245.91, IPv4, PIM v2, Mode: Sparse
   Hello Option Holdtime: 65535 seconds
   Hello Option DR Priority: 1
   Hello Option LAN Prune Delay: delay 500 ms override 2000 ms
   Join Suppression supported
   
   Interface: pd-6/0/0.32768
   Address: 0.0.0.0, IPv4, PIM v2, Mode: Sparse
   Hello Option Holdtime: 65535 seconds
   Hello Option DR Priority: 0
   Hello Option LAN Prune Delay: delay 500 ms override 2000 ms
   Join Suppression supported

Related Topics

• PIM Sparse Mode Overview
• Configuring PIM Designated Router Election on Point-to-Point Links
• show pim neighbors in the Routing Protocols and Policies Command Reference