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ZT8101 Users Guide 117
Using the Web Console
IGMP Configurations
The Internet Group Management Protocol (IGMP) allows the switch to forward multicast traffic
intelligently on the switch. The switch “snoops” the IRMP query and report messages and forwards
traffic only to the ports that request the multicast traffic. This prevents the switch from
broadcasting the traffic to all ports and possibly affecting network performance.
IGMP requires a network device that learns about the presence of multicast groups on its subnets
and keeps track of group membership. Multicasting is not connection oriented, so data is delivered
to the requesting hosts on a best-effort level of service.
The switch has two configuration screens for IGMP:
• The IGMP snooping screen allows you to configure the switch for snooping and querying.
• The IGMP interface screen allows you to configure the switch to keep track of IGMP groups.
To configure IGMP snooping
1. In the left panel, click Layer 3 IP Networking.
2. In the top panel under IP Multicast Routing Protocols, click IGMP Snooping
Configurations.
3. Select a VLAN and click Edit.
4. Configure these fields.
5. Click Apply.
The following conditions affect the fields on the IGMP snooping screen:
• The switch IGMP snooping flag must be enabled for these settings to have any effect.
• If the IGMP settings have been enabled for the IP interface associated with the VLAN you
select, the only field available on the IGMP snooping screen is the State field.
Field Description
Querier State
Specifies whether this VLAN should respond to IGMP queries. Three
options are available:
• No—Prevents this VLAN from becoming a querier.
• V1—Enables the sending of IGMP query packets when needed.
• V2—Enables the sending of IGMP query and leave packets according
to the IGMP V2 specification.
Query Interval
Specifies the time that can elapse between general IGMP queries. Enter a
value between 1—65535 seconds. The default is 125.
Robustness Variable
Specifies the permitted packet loss on a link. Enter a value between 2—255.
The default is 2.
Max Response
Specifies the maximum time the switch can wait for IGMP member reports.
Enter a value between 1—25. The default is 10 seconds.
State
Enables or disables learning about IGMP groups. If enabled, the switch
limits multicast forwarding to active member ports.