TP-Link T2500G-10MPS T2500G-10MPSUN V1 Configuration Guide - Page 445
Example for Configuring Unknown Multicast and Fast Leave, Network Requirement, Configuration Scheme
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Configuring Layer 2 Multicast Configuration Examples 5.3 Example for Configuring Unknown Multicast and Fast Leave 5.3.1 Network Requirement A user experiences lag when he is changing channel on his IPTV. He wants solutions to this problem. As shown in the following network topology, port 1/0/4 on the switch is connected to the upper layer network, and port 1/0/2 is connected to Host B. Figure 5-14 Network Topology for Unknow Multicast and Fast Leave Source Internet Querier Gi1/0/4 VLAN 10 Gi1/0/2 Host B Receiver 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. Configuration Guide 418
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