Configuration Guide 358
Configuring Layer 2 Multicast Configuration Examples
Figure 5-13 Network Topology for Unknow Multicast and Fast Leave
Internet
Host B
Receiver
VLAN 10
Querier
Source
Gi1/0/4
Gi1/0/2
5.3.2 Configuration Scheme
After the channel is changed, the client (Host B) still receives irrelevant multicast data,
the data from the previous channel and possibly other unknown multicast data, which
increases the network load and results in network congestion. The solution to this problem
is using Unknown Multicast and Fast Leave.
To avoid Host B from receiving irrelevant multicast data, the user can enable Fast Leave
on port 1/0/2 and enable Unknown Multicast globally. To change channel, Host B sends a
leave message about leaving the previous channel. The switch will then drop multicast data
from the previous channel and all unknown multicast data, which ensures that Host B only
receives multicast data from the new channel and that the multicast network is unimpeded.
Demonstrated with T1600G-52TS, this section provides configuration procedures in two
ways: using the GUI and using the CLI.
5.3.3 Using the GUI
1) Choose the menu Multicast > IGMP Snooping > Snooping Config to load the following
page. Enable IGMP Snooping globally and configure Unknown Multicast as Discard.
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