4000 Router Series IP Multicast Configuration Guide

Configuration procedure

1. Configure the IP address and subnet mask for each interface as shown in Figure 18. (Details not

shown.)

2. Enable OSPF on the routers in the PIM-DM domain to make sure the network-layer on the PIM-DM

network is interoperable and the routing information among the routers can be dynamically

updated. (Details not shown.)

3. Enable IP multicast routing, and enable IGMP and PIM-DM:

# On Router B, enable IP multicast routing globally, enable IGMP on Ethernet 1/1, and enable

PIM-DM on each interface.

<RouterB> system-view

[RouterB] multicast routing

[RouterB-mrib] quit

[RouterB] interface ethernet 1/1

[RouterB-Ethernet1/1] igmp enable

[RouterB-Ethernet1/1] pim dm

[RouterB-Ethernet1/1] quit

[RouterB] interface ethernet 1/2

[RouterB-Ethernet1/2] pim dm

[RouterB-Ethernet1/2] quit

[RouterB] interface ethernet 1/3

[RouterB-Ethernet1/3] pim dm

[RouterB-Ethernet1/3] quit

# On Router A, enable IP multicast routing globally and enable PIM-DM on each interface.

<RouterA> system-view

[RouterA] multicast routing

[RouterA-mrib] quit

[RouterA] interface ethernet 1/1

[RouterA-Ethernet1/1] pim dm

[RouterA-Ethernet1/1] quit

[RouterA] interface ethernet 1/2

[RouterA-Ethernet1/2] pim dm

[RouterA-Ethernet1/2] quit

[RouterA] interface ethernet 1/3

[RouterA-Ethernet1/3] pim dm

[RouterA-Ethernet1/3] quit

# Enable IP multicast routing and PIM-DM on Router C in the same way Router A is configured.

(Details not shown.)

# Use the display multicast rpf-info command to display the RPF route to the source on Router B.

[RouterB] display multicast rpf-info 50.1.1.100

RPF information about source 50.1.1.100:

RPF interface: Ethernet1/3, RPF neighbor: 30.1.1.2

Referenced route/mask: 50.1.1.0/24

Referenced route type: igp

Route selection rule: preference-preferred

Load splitting rule: disable

The output shows that the current RPF route on Router B is contributed by a unicast routing protocol

and the RPF neighbor is Router A.