3Com Switch 7750 Configuration Guide Guide

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392 CHAPTER 40: IGMP SNOOPING CONFIGURATION

Configuring IGMP

Snooping Filtering ACLs

You can configure multicast filtering ACLs on the switch ports connected to user

ends so as to use the IGMP Snooping filter function to limit the multicast streams

that the users can access. With this function, you can treat different VoD users in

different ways by allowing them to access the multicast streams in different

multicast groups.

In practice, when a user orders a multicast program, an IGMP report message is

generated. When the message arrives at the switch, the switch examines the

multicast filtering ACL configured on the access port to determine if the port can

join the corresponding multicast group or not. If yes, it adds the port to the

forward port list of the multicast group. If not, it drops the IGMP report message

and does not forward the corresponding data stream to the port. In this way, you

can control the multicast streams that users can access.

Make sure that ACL rules have been configured before configuring this feature.

Configure IGMP Snooping filtering ACLs globally

Configure IGMP Snooping filtering ACLs for a port

■ One port can belong to multiple VLANs. Only one ACL rule can be configured

on each of the VLANs to which the port belongs.

■ If the port does not belong to the VLAN where the command is configured, the

configured ACL rule does not take effect.

■ If no ACL rule is configured in the command, the multicast packets of all the

multicast groups are rejected.

Tabl e 311 Configure IGMP Snooping filtering ACLs globally

Operation Command Description

Enter system view system-view -

Enable IGMP Snooping filter

in system view

igmp-snooping

group-policy acl-number [

vlan vlan-list ]

Required

■ You can configure the ACL

to filter the IP addresses of

corresponding multicast

group.

■ By default, the multicast

filtering feature is disabled.

Tabl e 312 Configure IGMP Snooping filtering ACLs for a port