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2. Enable routing for the ports on the switch. The default link-level encapsulation format is Ethernet.<br />
Configure the IP addresses and subnet masks for the ports. Network-directed broadcast frames will be<br />
dropped and the maximum transmission unit (MTU) size will be 1500 bytes.<br />
Figure 219 Using the routing and ip address Commands to Enable Routing<br />
IGMP Proxy<br />
<strong>Force10</strong> #config<br />
<strong>Force10</strong> (Config)#interface 1/0/2<br />
<strong>Force10</strong> (Interface 1/0/2)#routing<br />
<strong>Force10</strong> (Interface 1/0/2)#ip address 192.150.2.1 255.255.255.0<br />
<strong>Force10</strong> (Interface 1/0/2)#exit<br />
<strong>Force10</strong> (Config)#interface 1/0/5<br />
<strong>Force10</strong> (Interface 1/0/5)#routing<br />
<strong>Force10</strong> (Interface 1/0/5)#ip address 192.150.5.1 255.255.255.0<br />
<strong>Force10</strong> (Interface 1/0/5)#exit<br />
<strong>Force10</strong> (Config)#exit<br />
The Layer 3 package of SFTOS fully supports IGMPv3, and is backward-compatible with IGMPv1 and v2.<br />
The purpose of the IGMP Proxy feature is to enable a multicast router to learn multicast group membership<br />
information and be able to forward multicast packets based upon the group membership information.<br />
IGMP Proxy is capable of functioning only in certain topologies that do not require multicast routing<br />
protocols (i.e. DVMRP, PIM-DM, and PIM-SM) and have a tree-like topology, because no support exists<br />
for features such as spanning tree that correct packet route loops.<br />
The proxy contains many downstream interfaces and a unique upstream interface explicitly configured. It<br />
performs the host side of the IGMP protocol on its upstream interface and the router side of the IGMP<br />
protocol on its downstream interfaces.<br />
The IGMP Proxy offers a mechanism for multicast forwarding based only upon IGMP membership<br />
information. The router must decide about forwarding packets on each of its interfaces based on the IGMP<br />
membership information. The proxy creates the forwarding entries based on the membership information,<br />
then adds it to the multicast forwarding cache (MFC) in order not to make the forwarding decision for<br />
subsequent multicast packets with the same combination of source and group. If you enable IGMP Proxy<br />
and then disable it, all the forwarding entries in the MFC are purged.<br />
As shown in Figure 222, use the ip igmp proxy command from the Interface Config mode to enable<br />
IGMP Proxy on the router. No multicast routing protocol should be enabled, and multicast forwarding<br />
must be enabled on the router.<br />
SFTOS Configuration Guide, Version <strong>2.5.2</strong>.0 259
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