OmniSwitch AOS Release 7 Advanced Routing Configuration Guide
March 2011
page 6-1
6 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 6-17
.
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 6-18
.
•
Enabling PIM on a specific interface—see
page 6-20
.
•
Enabling PIM mode on the switch—see
page 6-21
.
•
Mapping an IP multicast group to a PIM mode—see
page 6-22
.
•
Configuring Candidate Rendezvous Points (C-RPs)—see
page 6-24
.
•
Candidate Bootstrap Routers (C-BSRs)—see
page 6-25
.
•
Configuring Keepalive period—see
page 6-28
.
•
Configuring Notification period—see
page 6-29
.
•
Verifying PIM configuration—see
page 6-31
.
•
Enabling IPv6 PIM on a specific interface—see
page 6-35
.
•
Enabling IPv6 PIM mode on the switch—see
page 6-35
.