User's Manual

Configuration Guide of XGS-5240-Series
42-23
wnstream ports. Three IGMP Proxy enabled switches which are connected in tree topol
ogy, respectively have one port connected to multicast routers, and no less than one p
orts connected to hosts or upstream ports from other IGMP proxy enabled switches.
The configuration steps are listed below:
IGMP PROXY Switch1 configuration：
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
Switch(Config-if-Vlan2)#ip igmp proxy multicast-source
Route1 configuration:
Switch#config
Switch(config)#ip pim multicast
Switch(Config)#interface vlan 1
Switch(Config-if-Vlan1)#ip pim sparse-mode
Switch(Config-if-Vlan1)#ip pim bsr-border
Multicast Configuration:
Suppose the server provides programs through the multicast address 224.1.1.1, and
some hosts subscribe that program on the edge of the network. The host reports their
IGMP multicast group membership to Switch 2 and Switch 3 through downstream port
s. Switch 2 and Switch 3 then aggregate and forward them to Switch 1 which then for
wards the information to multicast router. When multicast dataflow arrives, the IGMP Pr
oxy enabled switches re-distribute the group membership through upstream ports and d
ownstream ports. When the multicast router receives the multicast dataflow from IGMP
proxy, it will consider the multicast data source is directly connected to the router, and
determine the identity of DR and ORIGINATOR. The multicast dataflow will be redistribu
ted according to the PIM protocol.
42.4.4 IGMP Proxy Troubleshooting
When IGMP Proxy function configuration and usage, IGMP Proxy might not run pro
perly because of physical connection or configuration mistakes. So the users should not
e that:
 Make sure physical connection correctly;
 Activate IGMP Proxy on whole Global mode (use ip igmp proxy);