AAM1212 User’s Guide
Chapter 7 Basic Setting Screens
75
7.4 IGMP Snooping
IGMP (Internet Group Multicast Protocol) is a session-layer protocol used to establish
membership in a multicast group - it is not used to carry user data. Refer to RFC 1112 and
RFC 2236 for information on IGMP versions 1 and 2 respectively.
A switch can passively snoop on IGMP Query, Report and Leave (IGMP version 2) packets
transferred between IP multicast routers/switches and IP multicast hosts to learn the IP
multicast group membership. It checks IGMP packets passing through it, picks out the group
registration information, and configures multicasting accordingly. IGMP snooping allows the
switch to learn multicast groups without you having to manually configure them.
The switch forwards multicast traffic destined for multicast groups (that it has learned from
IGMP snooping or that you have manually configured) to ports that are members of that
group. The switch discards multicast traffic destined for multicast groups that it does not
know. IGMP snooping generates no additional network traffic, allowing you to significantly
reduce multicast traffic passing through your switch.
7.5 Switch Modes
The AAM supports standalone and daisychain switch modes.
7.5.1 Standalone Switch Mode
"Standalone switch mode" relates to the AAM's operational behavior, not a standalone
network topology. The standalone switch mode allows either or both of the AAM's Ethernet
ports to connect to the backbone Ethernet network. You can also connect one of the AAM's
Ethernet ports to the Ethernet network and the other to another AAM (see
Current Date
This field displays the date you open this menu.
New Date (yyyy-
mm-dd)
Enter the new date in year, month and day format. The new date then appears in
the
Current Date
field after you click
Apply
.
Time Zone
Select the time difference between UTC (Universal Time Coordinated, formerly
known as GMT, Greenwich Mean Time) and your time zone from the drop-down
list box.
Apply
Click
Apply
to save your changes to the AAM’s volatile memory. The AAM loses
these changes if it is turned off or loses power, so use the
Config Save
link on the
navigation panel to save your changes to the non-volatile memory when you are
done configuring.
Cancel Click
Cancel
to start configuring the screen again.
Table 10
General Setup (continued)
LABEL
DESCRIPTION
Содержание AAM1212
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