Chapter 16: Multicast; Multicast Forwarding Overview - Cisco 350 Series Administration Manual

Managed switches

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Cisco 350, 350X and 550X Series Managed Switches, Firmware Release 2.4, ver 0.4

This section describes the Multicast Forwarding feature, and covers the following topics:

Multicast Forwarding Overview

MAC Group Address

IP Multicast Group Address

IPv4 Multicast Configuration

IPv6 Multicast Configuration

IGMP/MLD Snooping IP Multicast Group

Multicast Router Port

Unregistered Multicast

Multicast forwarding enables one-to-many information dissemination. Multicast applications

are useful for dissemination of information to multiple clients, where clients do not require

reception of the entire content. A typical application is a cable-TV-like service, where clients

can join a channel in the middle of a transmission, and leave before it ends.

The data is sent only to relevant ports. Forwarding the data only to the relevant ports conserves

bandwidth and host resources on links.

By default, all Multicast frames are flooded to all ports of the VLAN. It is possible to

selectively forward only to relevant ports and filter (drop) the Multicast on the rest of the ports

by enabling the Bridge Multicast filtering status in the

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