2000-A2-GB20-10
- 163 -
February 2004
Multicast (point-to-multipoint) is a communication feature that allows a
source host to send a message to a group of destination hosts.
Multicasting reduces traffic on the local network by sending only one
(multicast) packet out to a higher-bandwidth relay point.
Multicasting differs from broadcasting in that a receiver must join a
multicast group in order to receive group messages. Each multicast group
has its own group address, which is a Class D IP address—224.0.0.0—
239.255.255.255.
This chapter contains the following topics:
Enabling and Disabling Global IP Multicasting (page
164
)
Configuring PIM—Dense Mode by Port (page
164
)
Adding and Changing the Multicast Route Source (page
166
)
Displaying IGMP Groups (page
166
)
Displaying the IGMP Querier (page
167
)
Displaying the Multicast Routing Table (page
167
)
Displaying PIM Neighbor (page
168
)
Configur-
ing Multi-
cast
Type
M
to display the Multicast Configuration menu:
Figure 10–1. Multicast Configuration Menu
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NOTE
When the IAD prompts you for input, the current value is
displayed in parentheses. To conveniently accept the current
value, just press Enter.
*******************************************
Multicast Configuration Menu
*******************************************
E. Enable/Disable Global IP Multicasting
P. Config PIM - Dense Mode by Port
S. Add/Change Multicast Route Source
G. Show IGMP Group
Q. Show IGMP Querier
M. Show Multicast Routing Table
N. Show PIM Neighbor
