BigIron RX Series Configuration Guide 105153-1001986-01PIM SM traffic snooping 41BigIron RX(config)# vlan 100BigIron RX(config-vlan-100)# multicast static-group 224.10.1.1 include 10.43.1.12ethernet 3/4To configure the physical interface ethernet 3/4 to statically join all multicast streams on the uplinkinterface excluding the stream with source address of 10.43.1.12, enter commands such as thefollowing.BigIron RX(config)# vlan 100BigIron RX(config-vlan-100)# multicast static-group 224.10.1.1 exclude 10.43.1.12ethernet 3/4Syntax: [no] multicast static-group > uplinkSyntax: [no] multicast static-group <group-address> <port-list>IGMP v3 commandsSyntax: [no] multicast static-group <group-address> [include l exclude <source-address>] uplinkSyntax: [no] multicast static-group <group-address> [include l exclude <source-address>]<port-list>The group-address parameter specifies the group multicast address.The include or exclude keyword indicates a filtering action. You can specify which source (for agroup) to include or exclude. The include or exclude keyword is only supported on IGMPv3.The source-address parameter specifies the IP address of the multicast source. Each address mustbe added or deleted one line per source.The uplink parameter specifies the port as an uplink port that can receive multicast data for theconfigured multicast groups. Upstream traffic will be sent to the router and will not use a port.The port-list parameter specifies the range of ports to include in the configuration.The no form of this command removes the static multicast definition. Each configuration must bedeleted separately.PIM SM traffic snoopingBy default, when a BigIron RX receives an IP multicast packet, the device does not examine themulticast information in the packet. Instead, the device simply forwards the packet out all portsexcept the port that received the packet. In some networks, this method can cause unnecessarytraffic overhead in the network. For example, if the device is attached to only one group source andtwo group receivers, but has devices attached to every port, the device forwards group traffic out allports in the same broadcast domain except the port attached to the source, even though there areonly two receivers for the group.PIM SM traffic snooping eliminates the superfluous traffic by configuring the device to forward IPmulticast group traffic only on the ports that are attached to receivers for the group.PIM SM traffic snooping requires IP multicast traffic reduction to be enabled on the device. IPmulticast traffic reduction configures the device to listen for IGMP messages. PIM SM trafficsnooping provides a finer level of multicast traffic control by configuring the device to listenspecifically for PIM SM join and prune messages sent from one PIM SM router to another throughthe device.
