Zhone 2000 用户手册

- 163 -

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

‹

Configuring PIM—Dense Mode by Port (page

)

‹

Adding and Changing the Multicast Route Source (page

)

‹

Displaying IGMP Groups (page

)

‹

Displaying the IGMP Querier (page

)

‹

Displaying the Multicast Routing Table (page

‹

Displaying PIM Neighbor (page

)

Type M to display the Multicast Configuration menu: 

 

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