Configure Options on an IPv4 PIM Router

When IPv4 PIM is enabled globally, you can configure several PIM options for a router. The following steps configure the default VRF. To configure a specific VRF, see Configure Options for IPv4 PIM Multi-VRF.

Enter global configuration mode.
```
device# configure terminal
```

Enter router configuration mode.

device(config)# router pim
device(config-router-pim-vrf-default-vrf)#

Run the following commands as needed.
1. Configure the frequency with which a device sends PIM hello messages to its neighbors.
```
hello-interval 40
```
2. Configure the length of time a PIM device waits for hello messages before considering a neighbor to be absent.
```
nbr-timeout 160
```
3. Configure a bootstrap router as a candidate RP.
```
bsr-candidate interface loopback 11 mask 32
```
4. Configure the length of time a PIM device waits to stop traffic after receiving a Leave message.
```
prune-wait 5
```
5. Configure the frequency with which PIM Join and Prune messages are sent.
```
message-interval 180
```
6. Configure sources to use the shared RP tree instead of the Shortest Path Tree.
```
spt-threshold infinity
```
7. Configure sources to use the Shortest Path Tree instead of the shared RP tree.
```
no spt-threshold
```
8. Enable Source-Specific Multicast mode for a specific address range
```
ssm-enable range PL_ssm_range-230-to-234
```
9. Enable Source-Specific Multicast mode for the default address range of 232.0.0.0/8. This default range is displayed in the show ip pim settings output.
  ssm-enable