Dell PowerConnect 6248 Configuration Guide - Page 150
When to Enable IP Multicast on the PowerConnect 6200 Series Switch, IGMP Configuration, CLI Example
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When to Enable IP Multicast on the PowerConnect 6200 Series Switch Use the IP multicast feature on the PowerConnect 6200 Series switch to route multicast traffic between VLANs on the switch. If all hosts connected to the switch are on the same subnet, there is no need to configure the IP multicast feature. If the switch does not handle L3 routing, you can use IGMP snooping to manage port-based multicast group membership. For more information, see "IGMP Snooping" on page 40. If the local network does not have a multicast router, you can configure the switch to act as the IGMP querier. For more information, see "IGMP Snooping Querier" on page 43 IGMP Configuration The Internet Group Management Protocol (IGMP) is used by IPv4 hosts to send requests to join (or leave) multicast groups so that they receive (or discontinue receiving) packets sent to those groups. In IPv4 multicast networks, multicast routers are configured with IGMP so that they can receive join and leave request from directly-connected hosts. They use this information to build a multicast forwarding table. IPv6 multicast routers use the MLD protocol to perform the functions that IGMP performs in IPv4 networks. CLI Example The following example configures IGMP on a PowerConnect 6200 Series switch in order to route multicast traffic between VLANs. IP routing, IP multicasting, and IGMP are globally enabled on the router. Then, IGMP is configured on the selected interface(s). console#configure ip routing ip multicast ip igmp interface vlan 2 routing ip address 3.3.3.1 255.255.255.0 ip igmp exit exit A multicast router must also have a way to determine how to efficiently forward multicast packets. The information gathered by IGMP is provided to a multicast routing protocol (i.e., DVMRP, PIM-DM, and PIM-SM) configured on the router to ensure that multicast packets are delivered to all networks where there are interested receivers. Refer to those sections for configuration instructions. 150 Multicast