Configuring L2 Multicast Features; L2 Multicast Overview; What Are The Multicast Bridging Features - Dell PowerConnect 7048P Manual

Powerconnect 7000 series stackable layer 2 and 3 switches

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Configuring L2 Multicast Features

This chapter describes the layer 2 multicast features on the PowerConnect

7000 Series switches. The features this chapter describes include bridge

multicast filtering, Internet Group Management Protocol (IGMP) snooping,

Multicast Listener Discovery (MLD) snooping, and Multicast VLAN

Registration (MVR).

The topics covered in this chapter include:

Default L2 Multicast Values

Configuring L2 Multicast Features (Web)

Configuring L2 Multicast Features (CLI)

L2 Multicast Configuration Examples

L2 Multicast Overview

Multicast traffic is traffic from one source that has multiple destinations. The

L2 multicast features on the switch help control network flooding of Ethernet

multicast and IP multicast traffic by keeping track of multicast group

The PowerConnect 7000 Series switches support bridge multicast filtering

and bridge multicast forwarding. For Ethernet multicast traffic, the switch

uses a database called the Layer 2 Multicast Forwarding Database (MFDB) to

make forwarding decisions for packets that arrive with a multicast destination

MAC address. By limiting multicasts to only certain ports in the switch,

traffic is prevented from going to parts of the network where that traffic is

unnecessary.

When a packet enters the switch, the destination MAC address is combined

with the VLAN ID, and a search is performed in the Layer 2 MFDB. If no

match is found, then the packet is either flooded to all ports in the VLAN or

Configuring L2 Multicast Features