Igmp Proxy - Dell Force10 S2410-01-10GE-24P Configuration Manual

Figure 17-220. Using the routing and ip address Commands to Enable Routing
Force10 #config
Force10 (Config)#interface 1/0/2
Force10 (Interface 1/0/2)#routing
Force10 (Interface 1/0/2)#ip address 192.150.2.1 255.255.255.0
Force10 (Interface 1/0/2)#exit
Force10 (Config)#interface 1/0/5
Force10 (Interface 1/0/5)#routing
Force10 (Interface 1/0/5)#ip address 192.150.5.1 255.255.255.0
Force10 (Interface 1/0/5)#exit
Force10 (Config)#exit

IGMP Proxy

The Layer 3 package of SFTOS fully supports IGMPv3, and is backward-compatible with IGMPv1 and v2.
The purpose of the IGMP Proxy feature is to enable a multicast router to learn multicast group membership
information and be able to forward multicast packets based upon the group membership information.
IGMP Proxy is capable of functioning only in certain topologies that do not require multicast routing
protocols (i.e. DVMRP, PIM-DM, and PIM-SM) and have a tree-like topology, because no support exists
for features such as spanning tree that correct packet route loops.
The proxy contains many downstream interfaces and a unique upstream interface explicitly configured. It
performs the host side of the IGMP protocol on its upstream interface and the router side of the IGMP
protocol on its downstream interfaces.
The IGMP Proxy offers a mechanism for multicast forwarding based only upon IGMP membership
information. The router must decide about forwarding packets on each of its interfaces based on the IGMP
membership information. The proxy creates the forwarding entries based on the membership information,
then adds it to the multicast forwarding cache (MFC) in order not to make the forwarding decision for
subsequent multicast packets with the same combination of source and group. If you enable IGMP Proxy
and then disable it, all the forwarding entries in the MFC are purged.
As shown in Figure
IGMP Proxy on the router. No multicast routing protocol should be enabled, and multicast forwarding
must be enabled on the router.
17-223, use the
ip igmp proxy
command from the Interface Config mode to enable
Layer 3 Routing | 251