Chapter 30 Pim Commands - Alcatel-Lucent OmniSwitch 6850-48 Cli Reference Manual

Alcatel-lucent omniswitch 6850-48: reference guide

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Protocol-Independent Multicast (PIM) is an IP multicast routing protocol that uses routing information

provided by unicast routing protocols, such as RIP and OSPF. Note that PIM is not dependent on any

particular unicast routing protocol. Sparse mode PIM (PIM-SM) contrasts with flood-and-prune dense

mode multicast protocols, such as DVMRP and PIM Dense Mode (PIM-DM), in that multicast forward-

ing in PIM-SM is initiated only via specific requests.

Downstream routers must explicitly join PIM-SM distribution trees to receive multicast streams on behalf

of directly connected receivers or other downstream PIM-SM routers. This paradigm of receiver-initiated

forwarding makes PIM ideal for network environments where receiver groups are thinly populated and

bandwidth conservation is a concern, such as in wide area networks (WANs). PIM-DM uses RPF (Reverse

Path Forwarding) to prevent looping of multicast datagrams while flooding. If some areas of the network

do not have group members, PIM-DM will prune the forwarding branch by instantiating the prune state.

PIM-DM differs from PIM-SM in two essential ways:

There are no periodic joins transmitted, only explicitly triggered prunes and grafts.

There is no Rendezvous Point (RP). This is particularly important in networks that cannot tolerate a

single point of failure.

Alcatel-Lucent implementation of PIM can also be configured in an IPv6 environment.

MIB information for the PIM commands is as follows:

AlcatelIND1Pim_mib.htm

ALCATEL-IND1-PIM-MIB

IETF_PIM_BSR.mib

IETF_PIM_STD.mib

OmniSwitch CLI Reference Guide

30 PIM Commands