4000 Router Series IP Multicast Configuration Guide

Assume that Host A needs to receive the information addressed to multicast group 225.1.1.1. After the

multicast source 10.110.5.100/24 sends multicast packets to the multicast group, an SPT is established

through traffic flooding. Routers on the SPT path (Router A and Router D) have their (S, G) entries. Host

A sends an IGMP report to Router A to join the multicast group G, and a (*, G) entry is generated on

Router A. You can use the display pim routing-table command to display the PIM routing table

information on each router. For example:

# Display the PIM routing table information on Router A.

[RouterA] display pim routing-table

Total 1 (*, G) entry; 1 (S, G) entry

(*, 225.1.1.1)

Protocol: pim-dm, Flag: WC

UpTime: 00:04:25

Upstream interface: NULL

Upstream neighbor: NULL

RPF prime neighbor: NULL

Downstream interface(s) information:

Total number of downstreams: 1

1: Ethernet1/1

Protocol: igmp, UpTime: 00:04:25, Expires: never

(10.110.5.100, 225.1.1.1)

Protocol: pim-dm, Flag: ACT

UpTime: 00:06:14

Upstream interface: Ethernet1/2

Upstream neighbor: 192.168.1.2

RPF prime neighbor: 192.168.1.2

Downstream interface(s) information:

Total number of downstreams: 1

1: Ethernet1/1

Protocol: pim-dm, UpTime: 00:04:25, Expires: never

# Display the PIM routing table information on Router D.

[RouterD] display pim routing-table

Total 0 (*, G) entry; 1 (S, G) entry

(10.110.5.100, 225.1.1.1)

Protocol: pim-dm, Flag: LOC ACT

UpTime: 00:03:27

Upstream interface: Ethernet1/1

Upstream neighbor: NULL

RPF prime neighbor: NULL

Downstream interface(s) information:

Total number of downstreams: 2

1: Ethernet1/2

Protocol: pim-dm, UpTime: 00:03:27, Expires: never

2: Ethernet1/4

Protocol: pim-dm, UpTime: 00:03:27, Expires: never