TP-Link T2700G-28TQ T2700G-28TQ User Guide V1 - Page 252
PIM DM, Steps, Operation, Multicast Routing, Global Config
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Configure Switch A Steps Operation Note 1 Enable IP multicast On page Multicast Routing→ Global Config→ Global Config, routing. enable the multicast routing function. 2 Enable IGMP on On page Multicast Routing→ IGMP→ Interface Config, enable user-side interface. IGMP (version 3) on interface VLAN 10. Configure Switch B Steps Operation Note 1 Enable IP multicast On page Multicast Routing→ Global Config→ Global Config, routing. enable the multicast routing function. 2 Enable IGMP on On page Multicast Routing→ IGMP→ Interface Config, enable user-side interface. IGMP (version 2) on interface VLAN 20. Configure Switch C Steps Operation Note 1 Enable IP multicast On page Multicast Routing→ Global Config→ Global Config, routing. enable the multicast routing function. 2 Enable IGMP on On page Multicast Routing→ IGMP→ Interface Config, enable user-side interface. IGMP (version 2) on interface VLAN 20. 11.3 PIM DM PIM (defined in RFC 3973) is a popular multicast routing protocol within the AS. Instead of relying on one specific unicast routing protocol, PIM uses the static routing or unicast routing table generated by any unicast routing protocol (including RIP, OSPF, IS-IS, BGP etc) to perform routing for IP multicast data. Unlike some other multicast routing protocols, PIM doesn't update routing information between routers or maintain an independent route forwarding table. PIM uses the RPF (Reverse Path Forwarding) check mechanism to forward the multicast data. There are two types of multicast routing and forwarding tables in the multicast implementation: All the multicast route information will be summarized as a general multicast routing-table; The multicast forwarding-table is used to control the forwarding of the multicast packets directly. The multicast routing table consists of a group of (S, G) entries, and (S, G) route represents routing information from source S to group G. If the router supports multiple multicast routing protocols, its multicast routing table will contain multicast routes generated from multiple protocols. The router will chose the optimal multicast route according to multicast routing and forwarding strategy, and send it to the multicast forwarding table. The multicast routing protocol uses the RPF mechanism to establish the multicast routing entries, thus to guarantee the multicast data being transferred in the correct path. 240