mld-snooping query-interval

Function

The mld-snooping query-interval command sets an interval at which the querier sends general Query messages.

The undo mld-snooping query-interval command restores the interval.

The default interval is 125s.

By default, the interval is 125s.

Format

mld-snooping query-interval query-interval

undo mld-snooping query-interval

Parameters

Parameter	Description	Value
query-interval	Sets an interval at which the querier sends general Query messages.	The value is an integer ranging from 1 to 65535, in seconds.

Parameter

Description

Value

query-interval

Sets an interval at which the querier sends general Query messages.

The value is an integer ranging from 1 to 65535, in seconds.

Views

VLAN view

Default Level

2: Configuration level

Task Name and Operations

Task Name	Operations
l2mc	write

Usage Guidelines

Usage Scenario

The mld-snooping query-interval command provides the following functions:

Sets an interval at which the querier sends general Query messages.
After the querier function is enabled and an interval is set using the mld-snooping query-interval command, the querier sends general Query messages at the configured interval to maintain group member information. The shorter the interval is, the more sensitive the device is and the more bandwidth and system resources are occupied.
The interval for the querier to send general Query messages must be greater than the maximum time for the querier to wait for responses from hosts. Otherwise, multicast group members may be deleted incorrectly.
Adjusts the aging time of member interfaces.
After receiving a Report message from a downstream host, the device sets the aging time of the member interface using the following formula: Member interface aging time = Number of group-specific Query messages to be sent x Interval at which general Query messages are sent + Maximum time for the querier to wait for responses from downstream hosts. By default, the device sets the aging time to 130s. Run the mld-snooping query-interval command to set an interval at which general Query messages are sent, run the mld-snooping robust-count command to set the number of group-specific Query messages to be sent, and run the mld-snooping max-response-time command to set the maximum time that the querier waits for responses from downstream hosts.

Prerequisites

MLD snooping has been enabled using the mld-snooping enable command.

Configuration Impact

If the mld-snooping query-interval command is run more than once in the same view, the latest configuration overwrites the previous one.

Precautions

To use the mld-snooping query-interval configuration as a factor of adjusting the member interface aging time, set the same interval as that specified on its upstream device. Otherwise, multicast data transmission will be interrupted between the Layer 2 and Layer 3 devices.

The mld-snooping query-interval command fails to be run in a VLAN or VSI view in any of the following conditions:

The VLAN is bound to a VSI.
The VSI is bound to a BD.

Example

# Configure the querier in VSI vsi1 to send general Query messages at an interval of 100s.

<HUAWEI> system-view
[~HUAWEI] mld-snooping enable
[*HUAWEI] mpls
[*HUAWEI-mpls] quit
[*HUAWEI] mpls l2vpn
[*HUAWEI-l2vpn] quit
[*HUAWEI] vsi vsi1
[*HUAWEI-vsi-vsi1] mld-snooping query-interval 100

# Configure the querier in VLAN 100 to send general Query messages at an interval of 100s.

<HUAWEI> system-view
[~HUAWEI] mld-snooping enable
[*HUAWEI] vlan 100
[*HUAWEI-vlan 100] mld-snooping query-interval 100