Netgear XCM8806 Chassis Hardware Installation Guide - Page 1207

NETGEAR 8800 Chassis Switch CLI Manual Syntax Description forward-mcrouter-only name with-proxy vr vrname Specifies that the switch forward all multicast traffic to the multicast router only. Specifies a VLAN or vMAN on which to enable IGMP snooping. Controls how join and leave messages are forwarded from the specified virtual router. If this option is specified, one join message per query is forwarded, and a leave message is forwarded only if it is from the last receiver on the VLAN. Default Enabled. Usage Guidelines This command applies to both IGMPv2 and IGMPv3. IGMP snooping is enabled by default on the switch. If you are using multicast routing, IGMP snooping can be enabled or disabled. If IGMP snooping is disabled, all IGMP and IP multicast traffic floods within a given VLAN or vMAN. The forward-mcrouter-only, vlan, and with-proxy options control three separate and independent features. You can manage one feature at a time with the enable igmp snooping command, and you can enter the command multiple times as needed to control each feature. For example, you can enter the command twice to enable both the forward-mcrouter-only and with-proxy options. If a VLAN or vMAN is specified with the enable igmp snooping command, IGMP snooping is enabled only on that VLAN or vMAN. If no options are specified, IGMP snooping is enabled on all VLANs. The with-proxy option enables the IGMP snooping proxy feature, which reduces the number of join and leave messages forwarded on the virtual router as described in the table above. This feature is enabled by default. An optional optimization for IGMP snooping is the strict recognition of routers only if the remote devices are running a multicast protocol. Two IGMP snooping modes are supported: • The forward-mcrouter-only mode forwards all multicast traffic to the multicast router (that is, the router running PIM, DVMRP or CBT). • When not in the forward-mcrouter-only mode, the switch forwards all multicast traffic to any IP router (multicast or not), and any active member port to the local network that has one or more subscribers. Chapter 26. IP Multicast Commands | 1207