TP-Link T1500-28PCT T1500-28PCTTL-SL2428PUN V3 User Guide - Page 241

To enable IGMP Snooping Querier for a VLAN, IGMP Snooping should be enabled, Report, Suppression

Page 241 highlights

Configuring Layer 2 Multicast IGMP Snooping Configuration Report Suppression Member Port Aging Time Router Port Aging Time Leave Time IGMP Snooping Querier Enable or disable Report Suppression for the VLAN. When enabled, the switch will only forward the first IGMP report message for each multicast group to the IGMP querier and suppress subsequent IGMP report messages for the same multicast group during one query interval. This feature prevents duplicate report messages from being sent to the IGMP querier. Specify the aging time of the member ports in the VLAN. Once the switch receives an IGMP membership report message from a port, the switch adds this port to the member port list of the corresponding multicast group. Member ports that are learned in this way are called dynamic member ports. If the switch does not receive any IGMP membership report messages for a specific multicast group from a dynamic member port, it will no longer consider this port as a member port of this multicast group and delete it from the multicast forwarding table. Specify the aging time of the router ports in the VLAN. Once the switch receives an IGMP general query message from a port, the switch adds this port to the router port list. Router ports that are learned in this way are called dynamic router ports. If the switch does not receive any IGMP general query message from a dynamic router port within the router port aging time, the switch will no longer consider this port as a router port and delete it from the router port list. Specify the leave time for the VLAN. When the switch receives a leave message from a port to leave a multicast group, it will wait for a leave time before removing the port from the multicast group. During the period, if the switch receives any report messages from the port, the port will not be removed from the multicast group. Exceptions are as follows: •• If the member port ages out before the Leave Time ends and no report messages are received, the port will be removed from the multicast group once its Member Port Aging Time ends. •• The Leave Time mechanism will not take effect when Fast Leave takes effect. A proper leave time value can avoid other hosts connecting to the same port of the switch being mistakenly removed from the multicast group when only some of them want to leave. Enable or disable the IGMP Snooping Querier for the VLAN. When enabled, the switch acts as an IGMP Snooping Querier for the hosts in this VLAN. A querier periodically sends a general query on the network to solicit membership information, and sends group-specific queries when it receives leave messages from hosts. Note: To enable IGMP Snooping Querier for a VLAN, IGMP Snooping should be enabled both globally and in the VLAN. User Guide 218

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User Guide
218
Configuring Layer 2 Multicast
IGMP Snooping Configuration
Report
Suppression
Enable or disable Report Suppression for the VLAN.
When enabled, the switch will only forward the first IGMP report message for
each multicast group to the IGMP querier and suppress subsequent IGMP report
messages for the same multicast group during one query interval. This feature
prevents duplicate report messages from being sent to the IGMP querier.
Member Port
Aging Time
Specify the aging time of the member ports in the VLAN.
Once the switch receives an IGMP membership report message from a port,
the switch adds this port to the member port list of the corresponding multicast
group. Member ports that are learned in this way are called dynamic member
ports.
If the switch does not receive any IGMP membership report messages for a
specific multicast group from a dynamic member port, it will no longer consider
this port as a member port of this multicast group and delete it from the multicast
forwarding table.
Router Port
Aging Time
Specify the aging time of the router ports in the VLAN.
Once the switch receives an IGMP general query message from a port, the switch
adds this port to the router port list. Router ports that are learned in this way are
called dynamic router ports.
If the switch does not receive any IGMP general query message from a dynamic
router port within the router port aging time, the switch will no longer consider this
port as a router port and delete it from the router port list.
Leave Time
Specify the leave time for the VLAN.
When the switch receives a leave message from a port to leave a multicast group,
it will wait for a leave time before removing the port from the multicast group.
During the period, if the switch receives any report messages from the port, the
port will not be removed from the multicast group. Exceptions are as follows:
If the member port ages out before the Leave Time ends and no report
messages are received, the port will be removed from the multicast group
once its Member Port Aging Time ends.
The Leave Time mechanism will not take effect when Fast Leave takes effect.
A proper leave time value can avoid other hosts connecting to the same port of
the switch being mistakenly removed from the multicast group when only some of
them want to leave.
IGMP Snooping
Querier
Enable or disable the IGMP Snooping Querier for the VLAN.
When enabled, the switch acts as an IGMP Snooping Querier for the hosts in
this VLAN. A querier periodically sends a general query on the network to solicit
membership information, and sends group-specific queries when it receives leave
messages from hosts.
Note:
To enable IGMP Snooping Querier for a VLAN, IGMP Snooping should be enabled
both globally and in the VLAN.