Using Ip Multicast; All Contents Copyright (C) 2005 Zyxel Communications Corporation - ZyXEL Communications P-2608HWL-D1 Support Notes

Current Time: 00 : 11 : 38
New Time (hh:mm:ss): 00 : 11 : 36
Current Date: 2004 - 01 - 01
New Date (yyyy-mm-dd): 2004 - 01 - 01
Time Zone= GMT+0800
Daylight Saving= No
Start Date (mm-dd): 01 - 00
End Date (mm-dd): 01 - 00
Press ENTER to Confirm or ESC to Cancel:

Using IP Multicast

•
What is IP Multicast ?
Traditionally, IP packets are transmitted in two ways - unicast or broadcast. Multicast is a third way to
deliver IP packets to a group of hosts. Host groups are identified by class D IP addresses, i.e., those with
"1110" as their higher-order bits. In dotted decimal notation, host group addresses range from 224.0.0.0 to
239.255.255.255. Among them, 224.0.0.1 is assigned to the permanent IP hosts group, and 224.0.0.2 is
assigned to the multicast routers group.
IGMP (Internet Group Management Protocol) is the protocol used for multicasting. Through IGMP, IP hosts
report multicast group membership information to any immediate-neighbor multicast routers which decide if a
multicast packet needs to be forwarded.
During start up, the Prestige queries all directly connected networks to gather multicast group membership
information. The Prestige then updates the information through periodic queries.
The Prestige supports IGMP versions 1 and 2. You can enable/disable multicast setting on the Ethernet interface
or to the remote node.
•
IP Multicast Setup

All contents copyright (c) 2005 ZyXEL Communications Corporation.

P-2608HWL Series Support Notes
85