Enabling fast leave processing in Ethernet port view

Follow these steps to enable fast leave processing in Ethernet view:

 

 

To do…

 

Use the command…

 

Remarks

 

 

 

Enter system view

 

system-view

 

 

 

 

 

 

 

 

 

 

 

 

Enter Ethernet port view

 

interface interface-type

 

 

 

 

 

interface-number

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Enable fast leave processing

 

igmp-snooping fast-leave

 

Required

 

 

 

 

 

By default, the fast leave

 

 

 

for specific VLANs

 

[ vlan vlan-list ]

 

 

 

 

 

 

processing feature is disabled.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

zThe fast leave processing function works for a port only if the host attached to the port runs IGMPv2 or IGMPv3.

zThe configuration performed in system view takes effect on all ports of the device if no VLAN is specified; if one or more VLANs are specified, the configuration takes effect on all ports in the specified VLAN(s).

zThe configuration performed in Ethernet port view takes effect on the port no matter which VLAN it belongs to if no VLAN is specified; if one or more VLANs are specified, the configuration takes effect on the port only if the port belongs to the specified VLAN(s).

zIf fast leave processing and unknown multicast packet dropping are enabled on a port to which more than one host is connected, when one host leaves a multicast group, the other hosts connected to port and interested in the same multicast group will fail to receive multicast data for that group.

Configuring a Multicast Group Filter

On an IGMP Snooping-enabled device, the configuration of a multicast group allows the service provider to define restrictions on multicast programs available to different users.

In an actual application, when a user requests a multicast program, the user’s host initiates an IGMP report. Upon receiving this report message, the device checks the report against the ACL rule configured on the receiving port. If the receiving port can join this multicast group, the device adds this port to the IGMP Snooping multicast group list; otherwise the device drops this report message. Any multicast data that has failed the ACL check will not be sent to this port. In this way, the service provider can control the VOD programs provided for multicast users.

Make sure that an ACL rule has been configured before configuring this feature.

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3Com WX3000 Configuring a Multicast Group Filter, Enabling fast leave processing in Ethernet port view, System -view