Kontron AT8404 CLI - Manual (Page 138)

Switching Commands AT8404
AT8404 CLI Reference Manual Page 2 - 102
2.19.6 show igmpsnooping querier
Use this command to display IGMP Snooping Querier information. Configured information is displayed whether or
not IGMP Snooping Querier is enabled.
When the optional argument <vlanid> is not used, the command displays the following information.
When you specify a value for <vlanid>, the following additional information appears.
When the optional argument detail is used, the command shows the global information and the information for all
Querier-enabled VLANs.
2.20 MLD Snooping Commands
This section describes commands used for 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
only to those interfaces associated with IP multicast addresses. 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.
Format show igmpsnooping querier [{detail | vlan <vlanid>}]
Mode Privileged EXEC
Field Description
Admin Mode Indicates whether or not IGMP Snooping Querier is active on the switch.
Admin Version The version of IGMP that will be used while sending out the queries.
Querier Address The IP Address which will be used in the IPv4 header while sending out IGMP queries. It can
be configured using the appropriate command.
Query Interval The amount of time in seconds that a Snooping Querier waits before sending out the periodic
general query.
Querier Timeout The amount of time to wait in the Non-Querier operational state before moving to a Querier
state.
Field Description
VLAN Admin Mode Indicates whether iGMP Snooping Querier is active on the VLAN.
VLAN Operational
State
Indicates whether IGMP Snooping Querier is in “Querier” or “Non-Querier” state. When the
switch is in Querier state, it will send out periodic general queries. When in Non-Querier
state, it will wait for moving to Querier state and does not send out any queries.
VLAN Operational
Max Response
Time
Indicates the time to wait before removing a Leave from a host upon receiving a Leave
request. This value is calculated dynamically from the Queries received from the network. If
the Snooping Switch is in Querier state, then it is equal to the configured value.
Querier Election
Participation
Indicates whether the IGMP Snooping Querier participates in querier election if it discovers
the presence of a querier in the VLAN.
Querier VLAN
Address
The IP address will be used in the IPv4 header while sending out IGMP queries on this VLAN.
It can be configured using the appropriate command.
Operational
Version
The version of IPv4 will be used while sending out IGMP queries on this VLAN.
Last Querier
Address
Indicates the IP address of the most recent Querier from which a Query was received.
Last Querier
Version
Indicates the IGMP version of the most recent Querier from which a Query was received on
this VLAN.