Extreme 3804 User Guide
Summit24e3 Switch Installation and User Guide
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17
IP Multicast Routing
This chapter describes the following topics:
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For more information on IP multicasting, see the following publications:
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RFC 1112 – Host Extension for IP Multicasting
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RFC 2236 – Internet Group Management Protocol, Version 2
Overview
IP multicast routing is a function that allows a single IP host to send a packet to a group of IP hosts.
This group of hosts can include devices that reside on the local network, within a private network, or
outside of the local network.
This group of hosts can include devices that reside on the local network, within a private network, or
outside of the local network.
IP multicast routing consists of the following functions:
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A router that can forward IP multicast packets.
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A method for the IP host to communicate its multicast group membership to a router (for example,
Internet Group Management Protocol (IGMP)).
Internet Group Management Protocol (IGMP)).
NOTE
You should configure IP unicast routing before you configure IP multicast routing.
IGMP Overview
IGMP is a protocol used by an IP host to register its IP multicast group membership with a router.
Periodically, the router queries the multicast group to see if the group is still in use. If the group is still
active, a single IP host responds to the query, and group registration is maintained.
Periodically, the router queries the multicast group to see if the group is still in use. If the group is still
active, a single IP host responds to the query, and group registration is maintained.