3Com Switch 8800 Advanced Software V5 Configuration Guide

Configuration Task List 507
multicast information from Source travels from Switch A to Switch B and then to
Switch C.
Configuration Task
List
Complete these tasks to configure multicast routing and forwarding:
Configuring Multicast
Routing and
Forwarding
Enable IP Multicast
Routing
Before configuring any Layer 3 multicast functionality, you must enable IP
multicast routing.
Follow these steps to enable IP multicast routing:
c
CAUTION: IP multicast does not support the use of secondary IP address
segments. Namely, multicast can be routed and forwarded only through primary IP
addresses, rather than secondary addresses, even if configured on interfaces.
For details about primary and secondary IP addresses, refer to “Assigning an IP
Address to an Interface” on page 208.
Configuration
Prerequisites
Before configuring multicast routing and forwarding, complete the following
tasks:
■ Configure a unicast routing protocol so that all devices in the domain are
interoperable at the network layer.
■ Enable PIM (PIM-DM or PIM-SM).
Task Remarks
“Enable IP Multicast Routing” on page 507“Enable IP Multicast
Routing” on page 507
Required
“Configuring Multicast Static Routes” on page 508“Configuring
Multicast Static Routes” on page 508
Required
“Configuring a Multicast Route Match Rule” on page
508“Configuring a Multicast Route Match Rule” on page 508
Optional
“Configuring Multicast Load Splitting” on page 509“Configuring
Multicast Load Splitting” on page 509
Optional
“Configuring Multicast Forwarding Range” on page
509“Configuring Multicast Forwarding Range” on page 509
Optional
“Configuring Multicast Forwarding Table Size” on page
510“Configuring Multicast Forwarding Table Size” on page 510
Optional
“Displaying and Maintaining Multicast Routing and Forwarding” on
page 510
Optional
To do... Use the command... Remarks
Enter system view system-view -
Enable IP multicast routing multicast routing-enable Required
Disable by default