Asante IntraCore 6524, User Manual

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Advanced Management
Page 4-38
Packets delivered to members of the multicast group are identified by a single
multicast group address. Any host, regardless of whether it is a member of a
group, can send to a group. However, only the members of a group receive the
message. Membership in an IP multicast group is dynamic; hosts can join and
leave at any time. There is no restriction on the location or number of members
in a multicast group. A host can be a member of more than one multicast group
at a time.
IGMP Snooping
A traditional Layer-2 switch is unable to determine which end stations on the
LAN are interested in which multicast groups. To avoid unnecessary flooding,
the switch may use IGMP Snooping. That means the switch listens to IGMP
messages to learn which ports want multicast traffic from which multicast
groups. The switch inserts the correct Ethernet multicast address into the
forwarding table for the ports where an end station has joined a multicast
group.
Configuring Multicast Traffic Management
The Multicast Traffic Management Menu allows you to set up group
transmission. To access the Multicast Traffic Management Menu, type c in the
Configuration Menu. A screen similar to Figure 4-13 appears.
Figure 4-13 IP Multicast Traffic Management Menu
IntraCore 6524 IP Multicast Traffic Management Menu VLAN Index: [01]
IP Multicast Forwarding Database
--------------------------------
IP Multicast Address Count : 1
IGMP Status : [Enabled]
IGMP Proxy Report Forward : [Disabled]
Query Port Info: [+: Query Port -: Non-Query Port]
Query Port List: [01]-------- [09]-------- [17]-------- [25]--XXXXXX
<Cmd> <Description>
i Toggle IGMP Enable/Disable
x Toggle IGMP Proxy Report Forward Enable/Disable
m IP Multicast Forwarding Database Configuration
d Display Group Addresses
a Display Group Addresses in All VLAN
q Return to previous menu
Command>
Select VLAN Next VLAN Prev VLAN