# PIM Interface Configuration

Protocol Independent Multicast (PIM) is a multicast routing protocol that runs between routers. Whereas the Internet Group Management Protocol (IGMP) runs between hosts and routers to exchange multicast group membership information, PIM runs between routers to forward multicast traffic to multicast group members throughout the network.

By default, PIM-SM is disabled on all interfaces. After you create and enable PIM-SM in a virtual router, you must enable PIM-SM on the interfaces within that virtual router that transmit multicast traffic.

### To Configure a PIM Interface

1. Enter the necessary information:

PIM Instance: Select this option to create a PIM instance on the interface.

Protocol PIM: Select this option to enable PIM on the interface.

Bootstrap Border: Select this option to make this interface a bootstrap border. An interface that is a bootstrap (BSR) border receives and processes BSR messages, but it does not forward these messages to other interfaces even if there is a multicast group policy allowing BSR messages between zones.

Hello Interval: Specifies the interval at which the interface sends hello messages to its neighboring routers.

Join/Prune Interval: Specifies the interval, in seconds, at which the interface sends join-prune messages.

Designated Router Priority: Specifies the priority of the interface for the designated router election.

Accepted Neighbors: Specifies the neighbors with which an interface can form an adjacency.

2. Click Apply to save the configuration.