IPv6 Multicast Traffic Reduction
Notice that the receiver for group ff1e::3:4 is directly connected to the device. As a result, the device does not see a join message on behalf of the client. However, because MLD snooping also is enabled, the device uses the MLD group membership report from the client to select the port for forwarding traffic to group ff1e::3:4 receivers.
The MLD snooping feature and the PIM6 SM traffic snooping feature together build a list of groups and forwarding ports for the VLAN. The list includes PIM6 SM groups learned through join messages as well as MAC addresses learned through MLD group membership reports. In this case, even though the device never sees a join message for the receiver for group ff1e::3:4, the device nonetheless learns about the receiver and forwards group traffic to the receiver.
The device stops forwarding IP multicast traffic on a port for a group if the port receives a prune message for the group.
Notice that the ports connected to the source and the receivers are all in the same
The following figure shows another example application for PIM6 SM traffic snooping. This example shows devices on the edge of a Global Ethernet cloud (a Layer 2 Packet over SONET cloud). Assume that each device is attached to numerous other devices such as other Layer 2 Switches and Layer 3 Switches (routers).
FastIron Ethernet Switch IP Multicast Configuration Guide | 63 |
|
