Reference Guide

Configuring PIM-SM
Configuring PIM-SM is a three-step process.
1. Enable multicast routing (refer to the following step).
2. Select a rendezvous point.
3. Enable PIM-SM on an interface.
1. Enable multicast routing.
CONFIGURATION mode
ip multicast-routing
2. Enable PIM-Sparse Mode.
INTERFACE mode
ip pim sparse-mode
Examples of the show ip pim Commands
To display which interfaces are enabled with PIM-SM, use the show ip pim interface command
from EXEC Privilege mode.
Dell#show ip pim interface
Address Interface VIFindex Ver/ Nbr Query DR DR
Mode Count Intvl Prio
189.87.5.6 Te 4/11 0x2 v2/S 1 30 1 127.87.5.6
189.87.3.2 Te 4/12 0x3 v2/S 1 30 1 127.87.3.5
189.87.31.6 Te 7/11 0x0 v2/S 0 30 1 127.87.31.6
189.87.50.6 Te 7/13 0x4 v2/S 1 30 1 127.87.50.6
Dell#
NOTE: You can influence the selection of the Rendezvous Point by enabling PIM-Sparse Mode on a
Loopback interface and assigning a low IP address.
To display PIM neighbors for each interface, use the show ip pim neighbor command from EXEC
Privilege mode.
Dell#show ip pim neighbor
Neighbor Interface Uptime/Expires Ver DR
Address Prio/Mode
127.87.5.5 Te 4/11 01:44:59/00:01:16 v2 1 / S
127.87.3.5 Te 4/12 01:45:00/00:01:16 v2 1 / DR
127.87.50.5 Te 7/13 00:03:08/00:01:37 v2 1 / S
Dell#
To display the PIM routing table, use the show ip pim tib command from EXEC privilege mode.
Dell#show ip pim tib
PIM Multicast Routing Table
Flags: D - Dense, S - Sparse, C - Connected, L - Local, P - Pruned,
R - RP-bit set, F - Register flag, T - SPT-bit set, J - Join SPT,
Timers: Uptime/Expires
Interface state: Interface, next-Hop, State/Mode
(*, 192.1.2.1), uptime 00:29:36, expires 00:03:26, RP 10.87.2.6, flags: SCJ
Incoming interface: TenGigabitEthernet 4/12, RPF neighbor 10.87.3.5
Outgoing interface list:
PIM Sparse-Mode (PIM-SM)
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