Configuring Mld Query And Response Parameters - 3Com MSR 50 Series Configuration Manual

Configuring MLD Query
and Response
Parameters
Configuring the Router-Alert option for MLD messages globally
Follow these steps to configure the Router-Alert option for MLD messages
globally:
To do...
Enter system view
Enter MLD view
Configure the interface to
discard any MLD message
without the Router-Alert
option
Enable the insertion of the
Router-Alert option into MLD
messages
Configuring the Router-Alert option on an interface
Follow these steps to configure the Router-Alert option on an interface:
To do...
Enter system view
Enter interface view
Configure the interface to
discard any MLD message
without the Router-Alert
option
Enable the insertion of the
Router-Alert option into MLD
messages
The MLD querier periodically sends MLD general queries at the "MLD query
interval" to determine whether any IPv6 multicast group member exists on the
network. You can modify the query interval based on the actual condition of the
network.
On startup, the MLD querier sends "startup query count" MLD general queries at
the "startup query interval", which is 1/4 of the "MLD query interval". Upon
receiving an MLD done message, the MLD querier sends "last listener query
count" MLD multicast-address-specific queries at the "MLD last listener query
interval". Both startup query count and last listener query count are set to the
MLD querier robustness variable.
MLD is robust to "robustness variable minus 1" packet losses on a network.
Therefore, a greater value of the robustness variable makes the MLD querier
"more robust", but results in a longer IPv6 multicast group timeout time.
Upon receiving an MLD query (general query or multicast-address-specific query)
message, a host starts a timer for each IPv6 multicast group it has joined. The
timer is initialized to a random value in the range of 0 to the maximum response
delay (the host obtains the maximum response delay from the Maximum Response
Delay field in the MLD query message it received). When the timer value drops to
Adjusting MLD Performance
Use the command...
system-view
mld
require-router-alert
send-router-alert
Use the command...
system-view
interface interface-type
interface-number
mld require-router-alert
mld send-router-alert
Remarks
-
-
Optional
By default, the device does not
check MLD messages for the
Router-Alert option.
Optional
By default, MLD messages carry
the Router-Alert option.
Remarks
-
-
Optional
By default, the device does
not check MLD messages for
the Router-Alert option.
Optional
By default, MLD messages
carry the Router-Alert option.
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