# PIM-SM and PIM-SSM configuration

The following section contains procedures for configuring PIM-SM and PIM-SSM.

## Prerequisites for PIM configuration

Before you can configure PIM, you must prepare the switch as follows:

1. Install the Advanced Routing software license.

   Important

   If your Ethernet Routing Switch is running an Advanced License for a release prior to Release 6.0, to enable PIM-SM you must regenerate your license file from the Avaya web site and install the new license file on the switch.

2. Enable routing globally.

3. Configure IP addresses and enable routing on the VLAN interfaces on which you want to configure PIM-SM.

4. Enable a unicast protocol, either RIP or OSPF, globally and on the interfaces on which you want to configure PIM.

   Important

   PIM requires a unicast protocol to multicast traffic within the network when performing the Reverse Path Forwarding (RPF) check. PIM also uses the information from the unicast routing table to create and maintain the shared and shortest path multicast tree. The unicast routing table must contain a route to every multicast source in the network, as well as routes to PIM entities such as the rendezvous points (RP) and bootstrap router (BSR).

## Configuring PIM-SM

Use the following procedure to configure PIM-SM.

1. Enable PIM globally.

   (If desired, modify the default global PIM properties.)

2. Enable PIM on individual VLAN interfaces.

   (If desired, modify the default VLAN PIM properties.)

3. For PIM-SM, configure candidate RPs for the multicast groups in the network. (It is best to have multiple candidate-RPs in the network; however, with the Ethernet Routing Switch 5000, you can only configure one candidate-RP per switch for any number of groups.)

   OR

   Configure one (or several) static RPs for the multicast groups in the network. (To enable static RP in the PIM-SM domain, you must configure the same static RPs on every system that takes part in PIM forwarding.)

4. For PIM-SM, configure one or several candidate BSRs to propagate RP information to all switches in the network. You can configure every PIM-enabled VLAN as a C-BSR. (If Static RP is enabled, this step is not required.)

   Important

   Ensure that all routers in the path from the receivers to the RP and to the multicast source are PIM-enabled. Also ensure that all PIM routers have unicast routes to reach the source and RP through directly-connected PIM neighbors.

## Configuring PIM-SSM

### About this task

Use the following procedure to configure PIM-SSM.

### Procedure

1. Enable PIM globally and change PIM mode to SSM. (If desired, modify the default global PIM properties.)
2. Enable PIM on individual VLAN interfaces. (If desired, modify the default VLAN PIM properties.)
3. If you use PIM-SSM with the IGMPv3 protocol, then configure this option on each VLAN.

### Next Steps

The following additional configurations are optional and can be configured according to the requirements of your network.