Configuring router protocol independent multicast (PIM)

For more information, see Configuration steps for PIM-SM.

The following steps configure PIM-SM in the router PIM context (switch(pim)#_):

  1. Specify the VLAN interface to advertise as the Bootstrap Router (BSR) candidate and enable the router to advertise itself as a candidate BSR in a PIM-SM domain. (Use the command bsr-candidate source-ip-vlan [vid]. )
  2. Optional: To make BSR candidate selection occur quickly and predictably, set a different priority on each BSR candidate in the domain. (Use the command bsr-candidate priority.)
  3. Do one of the following to configure RP operation:
    • Recommended: Enable Candidate Rendezvous Point (C-RP) operation and configure the router to advertise itself as a C-RP to the BSR for the current domain. This step includes the option to allow the C-RP to be a candidate for either all possible multicast groups or for up to four multicast groups and/or ranges of groups. Use the command
      rp-candidate source-ip-vlan [vid] [group-addr/group-mask .]
    • Optional: Use the command
      rp-address [ip-addr] [group-addr/group-mask]
      to statically configure the router as the RP for a specified multicast group or range of multicast groups. (This must be configured on all PIM-SM routers in the domain.)
  4. Optional: In the PIM router context, change one or more of the traffic control settings in the following table.

    Options accessed in router PIM context


    rp-candidate group-prefix [group-addr/group-mask]

    Enter an address and mask to define an additional multicast group or a range of groups.

    rp-candidate hold-time [30-255]

    Tells the BSR how long it should expect the sending C-RP router to be operative. Default: 150; 0 if router is not a candidate

    rp-candidate priority [0-255]

    Changes the priority for the C-RP router. When multiple C-RPs are configured for the same multicast groups, the priority determines which router becomes the RP for such groups. A smaller value means a higher priority. Default: 192

    [no] spt-threshold
    Changing the shortest-path tree (SPT) operation

    Disable or enable the router's ability to switch multicast traffic flows to the shortest path tree. Default: enabled

    join-prune-interval [5-65535]

    Changing the interval for PIM-SM neighbor notification

    Option: Globally change the interval for the frequency at which join and prune messages are forwarded on the router's VLAN interfaces. Default: 60 seconds

    trap [neighbor-loss | hardware-mrt-full | software-mrt-full | all]

    Option: Enable or disable PIM traps. Default: disabled