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OmniSwitch 6800/6850/9000 Advanced Routing Configuration Guide December 2007 page 7-1
7 Configuring PIM
Protocol-Independent Multicast (PIM) is an IP multicast routing protocol that uses routing information
provided by unicast routing protocols such as RIP and OSPF. PIM is “protocol-independent” because it
does not rely on any particular unicast routing protocol. PIM-Sparse Mode (PIM-SM) contrasts with flood-
and-prune dense mode multicast protocols, such as DVMRP and PIM-Dense Mode (PIM-DM) in that
multicast forwarding in PIM-SM is initiated only via specific requests, referred to as Join messages. PIM-
DM packets are transmitted on the same socket as PIM-SM packets, as both use the same protocol and
message format. Unlike PIM-SM, in PIM-DM there are no periodic joins transmitted, only explicitly trig-
gered prunes and grafts. Unlike PIM-SM, there is no Rendezvous Point (RP) in PIM-DM. This release
allows you to implement PIM in both the IPv4 and the IPv6 environments.
Source-Specific Multicast (PIM-SSM). The current implementation of PIM includes support for Source-
Specific Multicast (PIM-SSM). For more information on PIM-SSM support, refer to “PIM-SSM Support”
on page 7-31.
In This Chapter
This chapter describes the basic components of PIM and how to configure them through the Command
Line Interface (CLI). CLI commands are used in the configuration examples; for more details about the
syntax of commands, see the OmniSwitch CLI Reference Guide.
Configuration procedures described in this chapter include the following:
• Enabling PIM on the switch—see page 7-18.
• Enabling PIM on a specific interface—see page 7-20.
• Enabling PIM mode on the switch—see page 7-21.
• Mapping an IP multicast group to a PIM mode—see page 7-22.
• Configuring Candidate Rendezvous Points (C-RPs)—see page 7-24.
• Candidate Bootstrap Routers (C-BSRs)—see page 7-25.
• Configuring Keepalive period—see page 7-28.
• Configuring Notification period—see page 7-29.
• Verifying PIM configuration—see page 7-32.
• Enabling IPv6 PIM on a specific interface—see page 7-35.
• Enabling IPv6 PIM mode on the switch—see page 7-35.
• Mapping an IPv6 multicast group to a PIM mode—see page 7-36.