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
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.
Field | Description | |
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| Specifies whether this VLAN should respond to IGMP queries. Three | |
| options are available: | |
Querier State | • No— Prevents this VLAN from becoming a querier. | |
• V1— Enables the sending of IGMP query packets when needed. | ||
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| • V2— Enables the sending of IGMP query and leave packets according | |
| to the IGMP V2 specification. | |
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| |
Query Interval | Specifies the time that can elapse between general IGMP queries. Enter a | |
value between 1— 65535 seconds. The default is 125. | ||
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| |
Robustness Variable | Specifies the permitted packet loss on a link. Enter a value between 2— 255. | |
The default is 2. | ||
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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. | ||
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State | Enables or disables learning about IGMP groups. If enabled, the switch | |
limits multicast forwarding to active member ports. | ||
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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.
ZT8101 Users Guide | 117 |
