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Setting the MLD last listener query interval
A receiver host starts a report delay timer for an IPv6 multicast group when it receives an MLD
multicast-address-specific query for the group. This timer is set to a random value in the range of 0 to
the maximum response time advertised in the query. When the timer value decreases to 0, the host
sends an MLD report to the group.
The MLD last listener query interval defines the maximum response time advertised in MLD
multicast-address-specific queries. Set an appropriate value for the MLD last listener query interval
to speed up hosts' responses to MLD multicast-address-specific queries and avoid MLD report traffic
bursts.
Configuration restrictions and guidelines
When you set the MLD last listener query interval, follow these restrictions and guidelines:
•
The Layer 2 device does not send an MLD multicast-address-specific query if it receives an
MLD done message from a port enabled with fast-leave processing.
•
You can set the MLD last listener query interval globally for all VLANs in MLD-snooping view or
for a VLAN in VLAN view. For a VLAN, the VLAN-specific configuration takes priority over the
global configuration.
Setting the MLD last listener query interval globally
Step
Command
Remarks
1.
Enter system view.
system-view
N/A
2.
Enter MLD-snooping view.
mld-snooping
N/A
3.
Set the MLD last listener
query interval globally.
last-listener-query-interval
interval
The default setting is 1
second.
Setting the MLD last listener query interval in a VLAN
Step
Command
Remarks
1.
Enter system view.
system-view
N/A
2.
Enter VLAN view.
vlan vlan-id
N/A
3.
Set the MLD last listener
query interval in the VLAN.
mld-snooping
last-listener-query-interval
interval
The default setting is 1
second.
Configuring MLD snooping port features
Before you configure MLD snooping port features, complete the following tasks:
•
Enable MLD snooping for the VLAN.
•
Determine the aging timer for dynamic router ports.
•
Determine the aging timer for dynamic member ports.
•
Determine the addresses of the IPv6 multicast group and IPv6 multicast source.
Setting aging timers for dynamic ports
When you set aging timers for dynamic ports, follow these restrictions and guidelines:
•
If the memberships of IPv6 multicast groups frequently change, set a relatively small value for
the aging timer of the dynamic member ports. If the memberships of IPv6 multicast groups
rarely change, you can set a relatively large value.
