30
Step Command
Remarks
3.
Enable multicast source port
filtering.
source-deny
port
interface-list
Disabled by default.
Configuring multicast source port filtering on a port
Step Command
Remarks
1.
Enter system view.
system-view
N/A
2.
Enter Layer 2 Ethernet
interface view or Layer 2
aggregate interface view, or
enter 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
Use either command.
3.
Enable multicast source port
filtering.
igmp-snooping source-deny
Disabled by default.
Enabling dropping unknown multicast data
Unknown multicast data
refers to multicast data for which no forwarding entries exist in the IGMP
snooping forwarding table. When the switch receives such multicast traffic, one of the following
occurs:
•
When the function of dropping unknown multicast data is disabled, the switch floods unknown
multicast data in the VLAN that the unknown multicast data belongs to, causing network
bandwidth waste and low forwarding efficiency.
•
When the function of dropping unknown multicast data is enabled, the switch forwards unknown
multicast data to its router ports instead of flooding it in the VLAN. If no router ports exist, the
switch drops the unknown multicast data.
Configuration guidelines
•
The configurations made in IGMP snooping view are effective on all VLANs. The configurations
made in VLAN view are effective on only the ports in the current VLAN.
•
If the function of dropping multicast packets is enabled globally in IGMP snooping view,
multicast packets that are sent to IGMP snooping-enabled VLANs are all dropped. The
multicast packets mentioned here include both multicast data packets and protocol packets,
such as PIM, OSPF, and VRRP messages.
•
If the function of dropping unknown multicast data packets is enabled in VLAN view, the switch
forwards unknown multicast data packets to its router ports. In this case, if router ports do not
exist, the switch drops these multicast data packets. The switch supports processing unknown
multicast data packets destined for up to 2000 unknown multicast addresses at a time. The
switch floods excessive unknown multicast data packets directly.
•
The switch supports the function of dropping unknown multicast data packets configuring in up
to 500 VLANs.
Configuration procedure
To enable dropping unknown multicast data in a VLAN:
Step Command
Remarks
1.
Enter system view.
system-view
N/A
