3Com Switch 8800 Advanced Software V5 Configuration Guide

Configuring Multicast Routing and Forwarding 509
■ If the device is not configured to use longest match for route selection, then:
1 The route with a higher priority will be selected;
2 If these routes have the same priority, the multicast static route will be selected.
Follow these steps to configure a multicast route match rule:
Configuring Multicast
Load Splitting
With the load splitting feature enabled, multicast traffic will be evenly distributed
among different routes.
Follow these steps to configure multicast load splitting:
Configuring Multicast
Forwarding Range
Multicast packets do not travel without a boundary in a network. The multicast
data corresponding to each multicast group must be transmitted within a definite
scope. Presently, you can define a multicast forwarding range by:
■ Specifying boundary interfaces, which form a closed multicast forwarding area,
or
■ Setting the minimum time to live (TTL) value required for a multicast packet to
be forwarded.
You can configure a forwarding boundary specific to a particular multicast group
on all interfaces that support multicast forwarding. A multicast forwarding
boundary sets the boundary condition for the multicast groups in the specified
range. If the destination address of a multicast packet matches the set boundary
condition, the packet will not be forwarded. Once a multicast boundary is
configured on an interface, this interface can no longer forward multicast packets
(including packets sent from the local device) or receive multicast packets.
Follow these methods to configure a multicast forwarding range:
To do... Use the command... Remarks
Enter system view system-view -
Configure the device to select
a route based on the longest
match
multicast longest-match Optional
In order of routing table
entries by default
To do... Use the command... Remarks
Enter system view system-view -
Configuring multicast load
splitting
multicast load-splitting {
source | source-group }
Required
Disabled by default
To do... Use the command... Remarks
Enter system view system-view -
Enter interface view interface interface-type
interface-number
-
Configure a multicast
forwarding boundary
multicast boundary
group-address { mask |
mask-length }
Required
No forwarding boundary by
default