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ZT8101 User’s Guide 77
Using the Telnet Console
IGMP Configuration
The Internet Group Management Protocol (IGMP) allows the switch to forward multicast traffic
intelligently on the switch. The switch “snoops” the IGMP 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 that 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. From the Main Menu, select Layer 3 - IP Networking Setup | IGMP Snooping
Configurations and press Enter.
2. Using the spacebar, toggle the Action field to either Add/Modify or Delete and configure
these fields.
3. Highlight APPLY and press Enter to make the changes.
These 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
VLAN Name Specifies the name of the VLAN you want to configure.
Querier Version
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.
Use the spacebar to toggle between the options.
Robustness Variable
Specifies the permitted packet loss on a link. Enter a value between 2—255.
The default is 2.
Query Interval
Specifies the time that can elapse between general IGMP queries. Enter a
value between 1—65535 seconds. The default is 125.
Max Response Time
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.