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Configuring an IGMP snooping policy
Configuration prerequisites
Before you configure an IGMP snooping policy, complete the following tasks:
• Enable IGMP snooping in the VLAN
• Determine the ACL rules for multicast group filtering
• Determine the maximum number of multicast groups that can pass the ports
• Determine the 802.1p precedence for IGMP messages
Configuring a multicast group filter
On an IGMP snooping–enabled switch, a multicast group filter enables the service provider to define
restrictions on multicast programs available to different users.
In an application, when a user requests a multicast program, the user’s host initiates an IGMP report.
After receiving this report message, the switch compares the report against the configured ACL rule. If
the port that received the report can join this multicast group, the switch adds an entry for this port in the
IGMP snooping forwarding table. Otherwise, the switch drops this report message. Any multicast data
that has failed the ACL check is not sent to this port. In this way, the service provider can control the
VOD programs provided for multicast users.
Configuring a multicast group filter globally
Follow these steps to configure a multicast group filter globally:
To do... Use the command... Remarks
Enter system view
system-view —
Enter IGMP snooping view
igmp-snooping —
Configure a multicast group filter
group-policy acl-number [ vlan
vlan-list ]
Required
By default, no group filter is
globally configured. That is, the
hosts in a VLAN can join any
valid multicast group.
Configuring a multicast group filter on a port or a group of ports
Follow these steps to configure a multicast group filter on a port or a group of ports:
To do... Use the command... Remarks
Enter system view
system-view
—
Enter Ethernet interface view,
Layer 2 aggregate interface view,
or port group view
interface interface-type interface-
number
Required
Use either approach
port-group manual port-group-
name
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