Netgear GS728TPP 사용자 설명서
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GS752TP, GS728TP, and GS728TPP Gigabit Smart Switches
Table 20. Querier VLAN Status Fields
Field
Description
VLAN ID
Specifies the VLAN ID on which the IGMP snooping querier is
administratively enabled and for which VLAN exists in the VLAN database.
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 sends 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.
switch sends 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.
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.
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.
Operational Max Response
Time
Time
Displays the maximum response time used in the queries that are sent by
the snooping querier.
the snooping querier.
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 sub protocol 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.
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 sub protocol 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.
data based on destination IPv6 multicast MAC addresses. The switch can be configured to
perform MLD snooping and IGMP snooping simultaneously.
The MLD snooping link contains features described in the following sections:
•
•
•
MLD Snooping Configuration
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
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