User guide

OmniSwitch AOS Release 7 Advanced Routing Configuration Guide March 2015 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 triggered prunes and grafts. In addition, there is no
Rendezvous Point (RP) in PIM-DM. This release allows you to implement PIM in both the IPv4 and the
IPv6 environments.
Note. This 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 7-18.
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 AOS Release 7 CLI Reference Guide.
Configuration procedures described in this chapter include the following:
• Enabling PIM on the switch—see page 7-19.
• 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 7-31.
• Enabling IPv6 PIM on a specific interface—see page 7-35.
• Enabling IPv6 PIM mode on the switch—see page 7-35.