Huawei quidway s3526 series Getting Started page 361

Command Manual - Multicast
Quidway S3500 Series Ethernet Switches
Parameter
acl_number: Number of basic access control list, in the range of 2000 to 2999.
vlanid: ID of VLAN to which the ethernet port belongs, ranging from 1 to 4094.
Description
Using igmp-snooping group-policy command, you can set the filtering of IGMP
Snooping to control the accessing to the multicast group. Using undo igmp-snooping
group-policy command, you can cancel the configured filtering.
By default, no filtering is configured on the switch.
IGMP snooping filter function can limit the programs that users can order, by
configuring some multicast filtering ACLs for users on the different switch ports, so that
different users can order different program sets.
In practice, when ordering a multicast program set, the user originates an IGMP report
packet. Upon receiving the packet, the switch first compares it against the multicast
ACLs configured on the inbound port. If allowed, the switch then adds the port to the
forward port list of the multicast group; otherwise, it drops the IGMP report packet and
no data flow then will be sent to this port. Thus the switch can control users' multicast
program ordering.
User-defined ACL rule is a multicast address or multicast address range (224.0.0.1 to
239.255.255.255)
If the rule is set as permit, the port can be added to the groups contained in the
permitted ACL range, but not to the groups outside the permitted ACL range.
If the rule is set as deny and no other ACL is set as permit, the port cannot be
added to the groups within the denied ACL range, nor to the groups outside the
denied ACL range.
Note:
Each VLAN of each port can only be configured with one ACL rule.
If no ACL rule is configured or the configured port doesn't belong to the specified
VLAN, the filtering configured by this command will not take effect.
Most devices just broadcast unknown multicast packets, s o to prevent the case
where multicast data flow is sent as unknown multicast packets to the filtered ports,
this function is generally configured in combination with the unknown multicast
dropping function.
For the related command, see unknown-multicast drop enable.
Chapter 2 IGMP Snooping Configuration Commands
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