Netgear GS752TXS Technical Information download pdf (Page 133)

Chapter 4: Configuring Switching Information | 133

GS752TXS Smart Switch Software Administration Manual

general queries to the interface.You should enable fast-leave admin mode only on

VLANs where only one host is connected to each layer 2 LAN port. This prevents the

inadvertent dropping of the other hosts that were connected to the same layer 2 LAN

port but were still interested in receiving multicast traffic directed to that group. Also,

fast-leave processing is supported only with IGMP version 2 hosts.

• Host Timeout. Sets the value for group membership interval of IGMP snooping for

the specified VLAN ID. The valid range is (Maximum Response Time + 1) to 3600

seconds.

• Maximum Response Time. Enter the amount of time in seconds that a switch will

wait after sending a query on the VLAN because it did not receive a report for a

particular group in that interface. value. The valid range is 1 to 25 seconds. Its value

must be less than the Host Timeout value.

• MRouter Timeout. Enter the amount of time that a switch will wait to receive a query

on the VLAN before removing it from the list of VLANs with multicast routers attached.

Enter a value between 0 and 3600 seconds. The default is 0 seconds, which means

there is no expiration.

• Query Mode. Enable or disable the IGMP Querier Mode for the specified VLAN ID.

• Query Interval. Enter the value for IGMP Query Interval for the specified VLAN ID.

The valid range is 1–1800 seconds. The default is 60 seconds.

2. Click Cancel to cancel the configuration on the screen and reset the data on the screen to

the latest value of the switch.

3. To disable IGMP snooping on a VLAN and remove it from the list, select the check box next

to the VLAN ID and click Delete.

4. To modify IGMP snooping settings for a VLAN, select the check box next to the VLAN ID,

update the desired values, and click Apply.

5. Click Cancel to cancel the configuration on the screen and reset the data on the screen to

the latest value of the switch.

IGMP Snooping Querier

IGMP snooping requires that one central switch or router periodically query all end-devices

on the network to announce their multicast memberships. This central device is the IGMP

querier. The IGMP query responses, known as IGMP reports, keep the switch updated with

the current multicast group membership on a port-by-port basis. If the switch does not

receive updated membership information in a timely fashion, it will stop forwarding multicasts

to the port where the end device is located.

These pages enable you to configure and display information on IGMP snooping queriers on

the network and, separately, on VLANs.

The IGMP Snooping Querier feature contains links to the following pages:

• IGMP Snooping Querier Configuration on page 134

• IGMP Snooping Querier VLAN Configuration on page 135

• IGMP Snooping Querier VLAN Status on page 136

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Netgear GS752TXS Technical Information Page 133