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Configuring a Designated Router for PIM

Configuring Interface Priority for PIM Designated Router Selection

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.

1. This example shows the configuration for the routing instance. Configure the interface globally or in the routing instance.
   [edit routing-instances PIM.master protocols pim interface ge-0/0/0.0 family inet]user@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

Configuring PIM Designated Router Election on Point-to-Point Links

To comply with the latest PIM drafts, enable designated router (DR) election on all PIM interfaces, including point-to-point (P2P) interfaces. (DR election is enabled by default on all other interfaces.) One of the two routing devices might join a multicast group on its P2P link interface. The DR on that link is responsible for initiating the relevant join messages.

1. On both point-to-point link routing devices, configure the routing device globally or in the routing instance. This example shows the configuration for the routing instance.
   [edit routing-instances PIM.master protocols pim]user@host# set dr-election-on-p2p
2. Verify the configuration by checking the State field in the output of the show pim interfaces command. The possible values for the State field are DR, NotDR, and P2P. When a point-to-point link interface is elected to be the DR, the interface state becomes DR instead of P2P.
3. If the show pim interfaces command continues to report the P2P state, consider running the restart routing command on both routing devices on the point-to-point link. Then recheck the state.

   Caution: Do not restart a software process unless specifically asked to do so by your Juniper Networks customer support representative. Restarting a software process during normal operation of a routing platform could cause interruption of packet forwarding and loss of data.

   [edit]user@host# run restart routing