Dell PowerConnect 8024, User Configuration Manual

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Configuring L2 Multicast Features
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Configuring L2 Multicast Features
This chapter describes the layer 2 multicast features on the PowerConnect
8000/8100-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:
• L2 Multicast Overview
• Snooping Switch Restrictions
• Default L2 Multicast Values
• Configuring L2 Multicast Features (Web)
• Configuring L2 Multicast Features (CLI)
• Case Study on a Real-World Network Topology
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
membership. It is essential that a multicast router be connected to a
PowerConnect layer 2 multicast switch for IGMP/MLD snooping to operate
properly. The presence of a multicast router allows the snooping switch to
relay IGMP reports to the router and to forward multicast data sources to the
multicast router as well as restrict flooding of multicast sources in a VLAN.
What Are the Multicast Bridging Features?
The PowerConnect 8000/8100-series switches support multicast filtering and
multicast flooding. For multicast traffic, the switch uses a database called the
Layer 2 Multicast Forwarding Database (MFDB) to make forwarding