Manual

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Москва, Новозаводская ул., 18, стр. 1
257
IGMP Proxy Topology Diagram
As it is show in the figure above, the switch functions as IGMP Proxy in a network of topology
of tree, the switch aggregates the multicast dataflow from upstream port and redistributes them
to the downstream ports, while the IGMP membership reports flow from downstream ports to
upstream ports. Three IGMP Proxy enabled switches which are connected in tree topology,
respectively have one port connected to multicast routers, and no less than one ports
connected to hosts or upstream ports from other IGMP Proxy enabled switches.
The configuration steps are listed below:
Switch#config
Switch(config)#ip igmp proxy
Switch(Config)#interface vlan 1
Switch(Config-if-Vlan1)#ip igmp proxy upstream
Switch(Config)#interface vlan 2
Switch(Config-if-Vlan2)#ip igmp proxy downstream
Multicast Configuration:
Suppose the multicast server offers some programs through 224.1.1.1. Some hosts subscribe
that program at the edge of the network. The IGMP multicast members report themselves to
the downstream ports of IGMP Proxy enabled Switch 2 and Switch 3. Switch 2 and Switch 3
then aggregate the group membership information and send them through the upstream ports.
Switch 1 finally forward these membership information to the multicast router when receiving
the group membership information through upstream ports, and deliver the multicast dataflow
Multicast
Server
Multicast
Router
IGMP
PROXY
Switch 2
IGMP
PROXY
Switch 1
IGMP
PROXY
Switch 3
Multicast
Router