PIM-DM Router Configuration

PIM-DM Router Configuration

Configuring PIM-DM on Cisco routers is a relatively simple exercise.

Figure 6-32: Basic PIM-DM router configuration

The first step is to enable multicast routing in global configuration mode using the command:

ip multicast-routing

Next, enable PIM-DM on the router interfaces using the interface command:

ip pim dense-mode

The router in Figure 6-32 has a basic configuration shown in the diagram. Although the configuration has EIGRP as the routing protocol, any of the IP routing protocols could have been used.

The PIM version can be configured using the interface configuration command:

ip pim version [1 | 2]

If an interface is configured for version 2 (the default) and a PIM version 1 neighbor is discovered on the interface, the router will automatically switch to PIM version 1. If the PIM version 1 neighbors somehow go away, the router will switch the interface back to PIM version 2.

The default interval for PIM query messages is 30 seconds. This can be adjusted using the interface command:

ip pim query-interval seconds

seconds

1—65535 seconds

The following command changes the PIM query interval to 60 seconds.

interface Serial 0

ip pim query-interval 60