H3C Technologies H3C S10500 Series Switches - Manual (Page 46)

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Configuring a multicast group filter
On an IGMP snooping–enabled switch, the configuration of a multicast group allows 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 Layer 2 Ethernet interface
view, Layer 2 aggregate interface
view, or port group view
Enter Layer 2 Ethernet interface
view or Layer 2 aggregate
interface view:
interface interface-type
interface-number
Enter port group view:
port-group manual
port-group-name
Required
Use either command
Configure a multicast group filter
igmp-snooping group-policy
acl-number [ vlan vlan-list ]
Required
By default, no group filter is
configured on the current port. That
is, the hosts on this port can join
any valid multicast group.
NOTE:
•
When you configure a multicast group filter in a multicast VLAN, be sure to configure the filter in the
sub-VLANs of the multicast VLAN. Otherwise, the configuration does not take effect.
• In IGMPv3, when a host is enabled to join multiple multicast groups, the multicast group filter cannot
correctly filter multicast groups because the host that runs IGMPv3 sends multiple multicast groups that
it wants to join in one membership report.