Dell Force10 E600i FTOS Version 8.4.1.5 Configuration Guide for ExaScale - Page 721
PIM-SM Snooping, Feature Overview
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Table 37-1. Egress Ports Used for Multicast Traffic with PIM-SM and IGMP Snooping Multicast Traffic PIM-SM and IGMP Snooping Configuration PIM-SM snooping DR flood with IGMP snooping flood PIM-SM snooping DR flood with no IGMP snooping flood Known multicast data packets IGMP flood with no PIM-SM snooping DR flood No PIM-SM snooping DR flood and no IGMP snooping flood Unknown multicast data packets PIM-SM snooping DR flood with IGMP snooping flood PIM-SM snooping DR flood with no IGMP snooping flood IGMP flood with no PIM-SM snooping DR flood No PIM-SM snooping DR flood and no IGMP snooping flood Egress Ports PIM-SM snooped VLANs PIM DR port IGMP snooped ports IGMP mrouter ports PIM-SM snooped VLANs PIM DR port IGMP snooped ports IGMP mrouter ports PIM-SM snooped VLANs IGMP snooped ports IGMP mrouter ports PIM-SM snooped VLANs IGMP snooped ports IGMP mrouter ports PIM DR port PIM DR port IGMP mrouter ports None IGMP mrouter ports For information on how to enable PIM-SM snooping and disable PIM DR flooding, refer to PIM-SM Snooping. PIM-SM Snooping e PIM-SM Snooping is supported on VLAN interfaces on platform: x In a Layer 2 VLAN, a switch normally floods multicast traffic to all member ports in the VLAN. PIM-SM snooping is designed to restrict multicast traffic to only the PIM-SM-enabled routers and IGMP hosts that should receive the traffic. When PIM-SM snooping is enabled, the switch learns the multicast ports on which receivers are listening through PIM hello and PIM-SM join/prune messages, and forwards multicast traffic only to the VLAN ports connected to valid receivers. Feature Overview PIM-SM snooping functions in a Layer 2 network in which multiple routers are interconnected by a switch, such as an IXP where Internet service providers (ISPs) exchange Internet traffic between their networks. By default, the switch floods multicast traffic to all VLAN member ports, regardless of whether there are multicast receivers downstream that are joined to a multicast group. When you enable PIM-SM snooping, the switch receives PIM hello and PIM-SM join/prune messages, and determines which multicast ports are connected to receivers to which multicast packets should be forwarded. Multicast data is forwarded only to VLAN member ports on which there are valid downstream receivers. PIM Sparse-Mode | 721
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