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DES-7200 Configuration Guide Chapter 8 IGMP Snooping
Configuration
8-16
8.2.11.4 Configuring IGMP Snooping
Suppression
For IGMP Snooping-enabled devices, a multicast group address may have
multiple IGMP users. When a user joins the multicast group and receives the
IGMP Query message, he or she will send an IGMP Report message. DES-7200
switches will forward every IGMP Query message to the multicast router. In this
way, the multicast router will receive multiple IGMP Report messages when it
sends an IGMP Query message to the ports on the IGMP Snooping-enabled
devices.
To reduce the pressure of the server on processing the IGMP Report messages,
the switch only forwards the first received IGMP Report message to the router
port while suppressing other IGMP Report messages. This is called IGMP
Snooping Suppression.
To enable IGMP Snooping suppression, execute the following commands in the
global configuration mode:
Command Function
DES-7200(config)# ip igmp snooping
suppression enable
Enable IGMP Snooping suppression.
By default, this function is enabled.
DES-7200(config)# no ip igmp snooping
suppression enable
Disable IGMP Snooping suppression.
The following example enables the IGMP Snooping suppression function:
DES-7200# configure terminal
DES-7200(config)# ip igmp snooping suppression enalbe
DES-7200(config)# end
8.2.12 Configuring the Multicast Security Control
(Optional) Configure source port check
(Optional) Configure source IP check
(Optional) Configure port filter
(Optional) Configure VLAN filter
(Optional) Configure multicast preview
8.2.12.1 Configuring Source Port Check
In global configuration mode, execute the following steps to configure source port
check:
Command Function
DES-7200(config)# ip igmp snooping
source-check port
Enable source port check.
DES-7200(config)# no ip igmp snooping
source-check port
Disable source port check.
The following example shows how to enable source port check:
DES-7200# configure terminal
DES-7200(config)# ip igmp snooping source-check port