Foundry Configuration Guide for the FESX, FSX, and FWSX
19 - 2 © Foundry Networks, Inc. December 2005
This chapter contains the following information:
Overview of IP Multicasting
Multicast protocols allow a group or channel to be accessed over different networks by multiple stations (clients)
for the receipt and transmit of multicast data.
Distribution of stock quotes, video transmissions such as news services and remote classrooms, and video
conferencing are all examples of applications that use multicast routing.
Foundry Layer 3 Switches support two different multicast routing protocols—Distance Vector Multicast Routing
Protocol (DVMRP) and Protocol-Independent Multicast (PIM) protocol along with the Internet Group Membership
Protocol (IGMP).
PIM and DVMRP are broadcast and pruning multicast protocols that deliver IP multicast datagrams. The protocols
employ reverse path lookup check and pruning to allow source-specific multicast delivery trees to reach all group
members. DVMRP and PIM build a different multicast tree for each source and destination host group.
NOTE: Both DVMRP and PIM can concurrently operate on different ports of a Foundry Layer 3 Switch.
Multicast Terms
The following are commonly used terms in discussing multicast-capable routers. These terms are used
throughout this chapter:
Node: Refers to a router or Layer 3 Switch.
Root Node: The node that initiates the tree building process. It is also the router that sends the multicast packets
down the multicast delivery tree.
Table 19.1: Chapter Contents
Description See Page
Overview of IP multicasting 19-2
Changing global IP multicast parameters 19-3
Adding an interface to a multicast group 19-6
Configuring PIM Dense 19-6
Configuring PIM Sparse 19-13
Dropping PIM traffic in hardware 19-31
Configuring Multicast Source Discovery (MSDP) 19-32
Configuring DVMRP 19-52
Configuring an IP tunnel 19-59
Using ACLs to control multicast features 19-60
Configuring a static multicast route 19-63
Tracing a multicast route 19-64
Displaying another multicast router’s multicast
configuration
19-66
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