H3C S9500 Series Operation Manual page 374

Operation Manual – Multicast Protocol
H3C S9500 Series Routing Switches
there is no member port or router port, the packets will be directly dropped, instead of
being forwarded.
Caution:
If IGMP snooping is not enabled on the VLAN (nor Layer 3 multicast), unknown
multicast packets are broadcasted within the VLAN no matter whether this function is
enabled or not. Therefore, to disable unknown multicast packets from flooding within a
VLAN, you must enable igmp-snooping in this VLAN and carry out the igmp-snooping
nonflooding-enable command.
Perform the following configuration in system view.
Table 2-5 Globally enable/disable multicast packets not broadcasted within a VLAN
Enable multicast packets not to be
broadcasted within a VLAN
Disable multicast packets not to be
broadcasted within a VLAN
By default, unknown multicast packets are broadcasted within the VLAN.
2.2.6 Configuring the Filtering Rule of Multicast Groups
On the IGMP snooping-enabled switch, you can configure ACL rules whether the
specified multicast group can be joined to a VLAN or not. This feature filters every
received IGMP join packet. According to the destination group address of the packets
and the ACL rule bound to the VLAN, the switch determines whether to discard the
packets or let them pass.
By setting the filtering rule of multicast groups in the VLAN, you can control access to IP
multicast groups. You can only configure one ACL rule for each VLAN, and the new
configured rule will replace the old one.
Perform the following configuration in system view.
Table 2-6 Configure the aging time of multicast group members
Set the filtering rule of multicast groups
in the specified VLAN
Operation
Operation
2-7
Chapter 2 IGMP Snooping Configuration
Command
igmp-snooping nonflooding-enable
undo
nonflooding-enable
Command
igmp-snooping
acl-number
igmp-snooping
group-policy