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CP6923 Switching Commands
Page 2 - 101 CP6923 CLI Reference Manual
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.
2.20.1 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:
• Validation of address version, payload length consistencies and discarding of the frame upon error.
• Maintenance of the forwarding table entries based on the MAC address versus the IPv6 address.
• Flooding of unregistered multicast data packets to all ports in 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.
Default disabled
Format
set mld <vlanid>
Mode • Global Config
• Interface Config
• VLAN Mode
Field Description