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Chapter 1

956651

IP Multicast Overview

Multicast Addressing

For multicast addressing, there are generally two types of addresses as follows: Well known addresses designated by IANA

  • Packets using the following Reserved Link Local Addresses (also called the Local Network Control Block [224.0.0.0 - 224.0.0.255]) are sent throughout the local subnet only and are transmitted with TTL=1.

Note

The addresses listed below are just a few of the many addresses in the Link Local Address space.

        • 224.0.0.1

          —Sent to all systems on a subnet.

        • 224.0.0.2

          —Sent to all routers on a subnet.

        • 224.0.0.5

          —Sent to all OSPF routers.

        • 224.0.0.6

          —Sent to all OSPF DRs.

        • 224.0.0.9

          —Sent to all RIPv2 routers.

        • 224.0.0.10

          —Sent to all IGRP routers.

        • 224.0.0.13

          —Sent to all PIMv2 routers.

        • 224.0.0.22

          —Sent to all IGMPv3 devices.

  • Packets using the following Internetwork Control Block (224.0.1.0 - 224.0.1.255) addresses are

also sent throughout the network.

Note

The addresses listed below are just a few of the many addresses in the Internetwork Control Block.

        • 224.0.1.39

          —Cisco-RP-Announce (Auto-RP)

        • 224.0.1.40

          — Cisco-RP-Discovery (Auto-RP)

Administratively scoped addresses (239.0.0.0 - 239.255.255.255). For more information, see RFC 2365.

Tip

For more information about multicast addresses, see http://www.iana.org/assignments/multicast-addresses.

Administratively-scoped addresses should be constrained to a local group or organization. They are used in a private address space and are not used for global Internet traffic. “Scoping” can be implemented to restrict groups with a given address or range from being forwarded to certain areas of the network.

Organization-local and site-local scopes are defined scopes that fall into the administratively scoped address range.

Organization-local scope (239.192.0.0 - 239.251.255.255)—Regional or global applications that are

used within a private enterprise network.

Site-local scope (239.255.0.0 - 239.255.255.255)—Local applications that are isolated within a site/region and blocked on defined boundaries.

Scoping group addresses to applications allows for easy identification and control of each application.

The addressing used in this chapter reflects the organization-local scope and site-local scope ranges found in the administratively scoped address range.

Cisco AVVID Network Infrastructure IP Multicast Design

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