Enabling PIM-SM
Enable IP multicast routing before you configure PIM.
With PIM-SM enabled on interfaces, routers can establish PIM neighbor relationship and process PIM messages from their PIM neighbors. As a best practice, enable PIM-SM on all non-border interfaces of routers when you deploy a PIM-SM domain.
![[IMPORTANT: ]](images/important.png) | IMPORTANT: All the interfaces on the same router must operate in the same PIM mode in the public network or the same VPN instance. | |
To enable PIM-SM:
Step | Command | Remarks |
|---|---|---|
1. Enter system view. | system-view | N/A |
2. Enable IP multicast routing and enter MRIB view. | multicast routing [ vpn-instance vpn-instance-name ] | By default, IP multicast routing is disabled. |
3. Return to system view. | quit | N/A |
4. Enter interface view. | interface interface-type interface-number | N/A |
5. Enable PIM-SM. | pim sm | By default, PIM-SM is disabled. |