Establishing Multicast Groups; Igmp Snooping; Multicast Group Configuration - NETGEAR GS748TNA Software User Manual

Smart Switch Software User Manual GS748T

Establishing Multicast Groups

You can specify specific ports and VLANs for receiving Multicast packets with specific MAC
addresses. The MAC addresses are IPv4 Multicast Addresses (RFC 1112A) formatted as:
01:00:5E-XX-XX-XX. A maximum of 64 groups is supported.

IGMP Snooping

IGMP (Internet Group Management Protocol) specifies how to register a host to a router in order
to receive specific multicast traffic. It allows your switch to examine IGMP packets and forward
them in ways based on their content.To receive messages, the switch must be configured to use
IGMP snooping in subnets that receive IGMP queries from either IGMP groups or the IGMP
snooping querier. IGMP snooping constrains multicast traffic at Layer 2 by dynamically
configuring Layer 2 LAN ports to forward multicast traffic only to those ports that want to receive
the messages. IGMP is a standard defined in RFC 1112 for IGMPv1 and in RFC 2236 for
IGMPv2.
Both IGMP Snooping and blocking of unknown multicast addresses (flooding) are disabled by
default.
To enable IGMP snooping:
1. Select Switching > Multicast > Basic from the main menu. The IGMP Snooping screen will
display.
2. Select the Enable radio box to enable the IGMP Snooping Status feature.
3. Select the Enable radio box for Block Unknown Multicast Addresses to allow unknown
multicast flooding.
4. Click Apply.

Multicast Group Configuration

The Static Multicast table allows you to add and delete static multicast groups. Up to 256 static
multicast groups can be supported.
To add a static multicast entry:
1. 1. Select Switching > Multicast > Advanced > Multicast group Configuration. The Multicast
Group Configuration screen will display.
2. Enter the following parameters for each field in the top row:
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v1.0, October 2007
Configuring the Switch