Netgear GS752TPS(B) - ProSAFE 48-Port Gigabit Stackable Smart Switch with PoE and 4 SFP uplinks Guia Do Programa

The following table describes the information available on the Querier VLAN Status page.

VLAN ID

Specifies the VLAN ID on which the IGMP Snooping Querier is 
administratively enabled and for which VLAN exists in the VLAN database.

Operational State

Specifies the operational state of the IGMP Snooping Querier on a VLAN:

•  Querier: The snooping switch is the querier in the VLAN. The snooping 

switch will send out periodic queries with a time interval equal to the 
configured querier query interval. If the snooping switch sees a better 
querier (numerically lower) in the VLAN, it moves to non-querier mode.

• Non-Querier: The snooping switch is in non-querier mode in the VLAN. If 

the querier expiry interval timer expires, the snooping switch moves into 
querier mode.

•  Disabled: The snooping querier is not operational on the VLAN. The 

snooping querier moves to disabled mode when IGMP snooping is not 
operational on the VLAN, when the querier address is not configured, or 
the network management address is not configured.

Operational Version

Displays the IGMP protocol version of the operational querier.

Last Querier Address

Displays the IP address of the last querier from which a query was snooped 
on the VLAN.

Last Querier Version

Displays the IGMP protocol version of the last querier from which a query 
was snooped on the VLAN.

Operational Max Response 
Time

Displays the maximum response time to be used in the queries that are sent 
by the snooping querier.

Click Refresh to redisplay the page with the latest information from the switch.

MLD Snooping

MLD is a protocol used by IPv6 multicast routers to discover the presence of multicast 
listeners (nodes wishing to receive IPv6 multicast packets) on its directly attached links and 
to discover which multicast packets are of interest to neighboring nodes. MLD is derived from 
IGMP; MLD version 1 (MLDv1) is equivalent to IGMPv2 and MLD version 2 (MLDv2) is 
equivalent to IGMPv3. MLD is a subprotocol of Internet Control Message Protocol version 6 
(ICMPv6), and MLD messages are a subset of ICMPv6 messages, identified in IPv6 packets 
by a preceding Next Header value of 58. 

The switch can snoop on both MLDv1 and MLDv2 protocol packets and bridge IPv6 multicast 
data based on destination IPv6 Multicast MAC Addresses. The switch can be configured to 
perform MLD Snooping and IGMP Snooping simultaneously.

In IPv4, Layer 2 switches can use IGMP Snooping to limit the flooding of multicast traffic by 
dynamically configuring Layer 2 interfaces so that multicast traffic is forwarded to only those 
interfaces associated with IP multicast address. In IPv6, MLD snooping performs a similar 
function. With MLD snooping, IPv6 multicast data is selectively forwarded to a list of ports