User Manual

Insight Managed 8-Port Gigabit (Hi-Power) PoE+ Smart Cloud Switch with NETGEAR FlexPoE Power
Configure Switching User Manual182
The following table describes the nonconfigurable information displayed on the page.
Table 38. Querier VLAN Status information
Field Description
VLAN ID The VLAN ID on which IGMP snooping querier is enabled.
Operational State The operational state of the IGMP snooping querier on a VLAN. It can be in any of the
following states:
• Querier.
The snooping switch is the querier in the VLAN. The snooping switch
sends out periodic queries with a time interval equal to the configured querier query
interval. If the snooping switch finds a better querier 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 or when the querier address is not configured or the network management
address is also not configured.
Operational Version The operational IGMP protocol version of the querier.
Last Querier Address The IP address of the last querier from which a query was snooped on the VLAN.
Last Querier Version The IGMP protocol version of the last querier from which a query was snooped on the
VLAN.
Operational Max
Response T
ime
The maximum response time to be used in the queries that are sent by the snooping
querier.
Configure MLD snooping
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
that want to receive the data, instead of being flooded to all ports in a VLAN. This list is
constructed by snooping IPv6 multicast control packets.
MLD snooping overview
Multicast Listener Discovery (MLD) is a protocol used by IPv6 multicast routers to discover
the presence of multicast listeners (nodes that must 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.