3Com 2928 User Guide - Page 291

Figure 1-7 Details about an IGMP snooping multicast entry Table 1-5Table 1-5Table 1-5 describes the IGMP snooping multicast entry information. Table 1-5 Description of IGMP snooping multicast entries Item VLAN ID Source Address Group Address Router Port(s) Member Port(s) Description ID of the VLAN to which the entry belongs Multicast source address, where 0.0.0.0 indicates all multicast sources. Multicast group address All router ports All member ports Return to IGMP snooping configuration task list. IGMP Snooping Configuration Examples Network requirements z As shown in Figure 1-8, Router A connects to a multicast source (Source) through Ethernet 1/2, and to Switch A through Ethernet 1/1. z The multicast source sends multicast data to group 224.1.1.1. Host A is a receiver of the multicast group. z IGMPv2 runs on Router A and IGMP snooping version 2 runs on Switch A. z The function of dropping unknown multicast packets is enabled on Switch A to prevent Switch A from flooding multicast packets in the VLAN if no corresponding Layer 2 forwarding entry exists. z The fast leave function is enabled for GigabitEthernet 1/0/3 on Switch A to improve bandwidth and resource usage. 1-9