Reference Guide

Table Of Contents
Column Meaning
VLAN Operational Max
Response Time
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
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 The IP address of the most recent Querier from which a Query was received.
Last Querier Version The IGMP version of the most recent Querier from which a Query was received on this
VLAN.
When the optional argument detail is used, the command shows the global information and the
information for all Querier-enabled VLANs.
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 trac by dynamically configuring Layer 2 interfaces so that
multicast trac 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.
Note
This feature is available for 220 switches only.
Note
This note clarifies the prioritization of MGMD Snooping Configurations. Many of the
IGMP/MLD Snooping commands are available both in the Interface and VLAN modes.
Operationally the system chooses or prefers the VLAN configured values over the Interface
configured values for most configurations when the interface participates in the VLAN.
set mld
This command enables MLD Snooping on the system (Global Config Mode) or an Interface (Interface
Config Mode). This command also enables MLD Snooping on a particular VLAN and enables MLD
Snooping on all interfaces participating in a VLAN.
If an interface has MLD Snooping enabled and you enable this interface for routing or enlist it as a
member of a port-channel (LAG), MLD Snooping functionality is disabled on that interface. MLD
Snooping functionality is re-enabled if you disable routing or remove port channel (LAG) membership
from an interface that has MLD Snooping enabled.
MLD Snooping supports the following activities:
Switching Commands
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