PIM-SM defaults, protocols, and supported configuration

Default configuration

PIM-SM is disabled by default. When PIM-SM is enabled, switching to SPT and LAN prune delay are the default configuration activated.

PIM specification

Complies with PIM-SM specification (RFC 4061).

BSR implementation

Complies with RFC 5059 (scope zones are not supported).

Routing protocol support

PIM uses unicast routing information from any of the routing protocols that are running on the system, such as OSPFv2, OSPFv3, BGP.

Max interface support per flow

Up to 127 outbound interfaces (and 1 inbound interface) are supported in the multicast routing table at any given time. The sum of all outbound interfaces across all current flows on a router may not exceed 127.

PIM enabled interfaces (L3 and SVI)
The maximum PIM enabled interface across all VRFs is the following with an upper limit of 128 per VRF:
  • 8320 switch: 500

  • 8400 switch: 1000

IGMP compatibility

PIM-SM is compatible with IGMP version 2 and version 3, and is fully interoperable with IGMP for determining multicast flows.


PIM-SM is fully interoperable with VRRP to quickly transition multicast routes in a failover.

VRF support

PIM-SM can run on multiple VRF instances in parallel. The maximum number of VRF instances supported is 8.

Static RPs count

PIM-SM supports a maximum of 8 static RPs per VRF.