Netgear XCM8810 Chassis User Manual - Page 755

NETGEAR 8800 User Manual Switch4 MSP ring MVlan, vc1 MVlan, vc1 1:3 V1 Switch1 1:4 V1 Switch2 Vlan V1 cloud Figure 92. MVR with STP EX_148 In this topology, subscribers are in a Layer 2 cloud on VLAN V1. STP is configured for all ports of V1. Since V1 spans on the ring as well, multicast cannot be forwarded on V1 blindly. Forwarding rules (described in MVR Forwarding on page 751), dictate that multicast traffic is not forwarded on STP enabled ports. This is to make sure that multiple copies of multicast packets are not forwarded on the ring. However, since other STP enabled ports on V1 (1:3,1:4) are not part of the ring multicast stream, they need to be configured so that they get the packets. To configure the ports to receive packets, use the following command (mentioned previously in MVR Forwarding ): configure mvr vlan add receiver port Note: If the Layer 2 cloud is connected back to ring ports, traffic may end up leaking into VLAN V1 in the ring. There is no way to avoid that. So, such topologies must be avoided. The following is a typical configuration for Switch 1 in Figure 92: create vlan v1 configure v1 tag 200 configure v1 add port 1:1, 1:2 tag configure v1 add port 1:3, 1:4 create vlan mvlan configure mvlan add port 1:1, 1:2 Chapter 27. Multicast Routing and Switching | 755