Zhone 4821-A2 Technical Information PDF herunterladen (Seite 18)

1. System Concepts

1-6 July 2004 4821-A2-GB21-00

IGMP Snooping

Internet Group Management Protocol (IGMP) snooping is a method of handling

multicast data streams by analyzing IGMP packets to learn multicast group

address and port associations.

The following parameters control IGMP snooping:

 Leave Delay – The amount of time that the multicast stream will continue on a

port after the receipt of a Leave message.

 Leave-Join Forwarding Delay – The amount of time that the start of a new

multicast stream on a port is delayed following the receipt of a leave message.

 Quick Query Wait Time – The amount of time to wait for a reply before

issuing another Quick Query message.

These parameters are set using the CLI or web interface.

Join A Query for A

Leave A

Query for A

Join B

Leave Delay Parameter

Send Join B Send Leave A and Stop Old Stream

Start New Stream

Leave - Join Forwarding Delay ParameterQuick Query Wait Time Parameter

From DSLAM

to Upstream

STB (Set-Top Box)

to/from DSLAM

Stream A

Stream B

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Zhone 4821-A2 Technical Information Seite 18