Cisco IE-5000 User Manual

675
Cisco Systems, Inc. www.cisco.com
Configuring IP Multicast Routing
This chapter describes how to configure IP multicast routing on the Cisco Industrial Ethernet switch, hereafter referred
to as switch. IP multicasting is a more efficient way to use network resources, especially for bandwidth-intensive services
such as audio and video. IP multicast routing enables a host (source) to send packets to a group of hosts (receivers)
anywhere within the IP network by using a special form of IP address called the IP multicast group address. The sending
host inserts the multicast group address into the IP destination address field of the packet, and IP multicast routers and
multilayer switches forward incoming IP multicast packets out all interfaces that lead to members of the multicast group.
Any host, regardless of whether it is a member of a group, can send to a group. However, only the members of a group
receive the message.
Note: For complete syntax and usage information for the commands used in this chapter, see the documents listed in
the Related Documents, page 730.
This chapter includes the following sections:
 Information About Cisco’s Implementation of IP Multicast Routing, page 675
 Prerequisites, page 685
 Guidelines and Limitations, page 686
 Default Settings, page 688
 Configuring IP Multicast Routing, page 688
 Configuring Advanced PIM Features, page 710
 Configuring Optional IGMP Features, page 712
 Configuring Optional Multicast Routing Features, page 721
 Verifying Configuration, page 725
 Configuration Example, page 727
 Related Documents, page 730
Information About Cisco’s Implementation of IP Multicast Routing
The switch supports these protocols to implement IP multicast routing:
 Internet Group Management Protocol (IGMP) is used among hosts on a LAN and the routers (and multilayer switches)
on that LAN to track the multicast groups of which hosts are members.
 Protocol-Independent Multicast (PIM) protocol is used among routers and multilayer switches to track which
multicast packets to forward to each other and to their directly connected LANs.
According to IPv4 multicast standards, the MAC destination multicast address begins with 0100:5e and is appended by
the last 23 bits of the IP address. On the switch, if the multicast packet does not match the switch multicast address, the
packets are treated in this way:

Cisco IE-5000 Specifications

General

Brand	Cisco
Model	IE-5000
Category	Switch
Language	English