Dell PowerConnect 6248 Configuration Guide - Page 40
IGMP Snooping, CLI Examples
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IGMP Snooping This section describes the Internet Group Management Protocol (IGMP) Snooping feature. IGMP Snooping enables the switch to monitor IGMP transactions between hosts and routers. It can help conserve bandwidth by allowing the switch to forward IP multicast traffic only to connected hosts that request multicast traffic. If you enable IGMP Snooping on the switch to listen to IGMP traffic, you do not need to enable IGMP, a layer 3 multicast protocol. IGMP Snooping is a layer 2 feature that allows the switch to dynamically add or remove ports from IP multicast groups by listening to IGMP join and leave requests. If you use the switch as a multicast router that can route multicast traffic between VLAN routing interfaces, you must enable a multicast routing protocol on the switch, such as PIM-SM. In this case, you can enable both IGMP and IGMP Snooping so that the switch routes IGMP traffic between VLANs and examines the IGMP packets for join and leave information. For information about configuring the PowerConnect 6200 Series switch as a mutlicast router that also performs IGMP snooping, see "Multicast Routing and IGMP Snooping" on page 157. IGMP snooping can be enabled per VLAN. The IGMP feature on the PowerConnect 6200 Series switches uses IGMPv3 by default. CLI Examples In this example, the PowerConnect 6200 Series switch is a L2 switch with one non-default VLAN, VLAN 100. The three hosts are connected to ports that are members of VLAN 100, and IGMP snooping is enabled on VLAN 100. Port 1/g20 connects the switch to the L3 multicast router and is also a member of VLAN 100. Figure 3-2. Switch with IGMP Snooping Host A Host B ` PowerConnect Switch 1/g5 1/g10 1/g15 ` 1/g20 Multicast Router Video Server Host C ` 40 Switching Configuration