3Com Switch 8800 Advanced Software V5 Configuration Guide

644 CHAPTER 44: MLD CONFIGURATION
0, the host sends an MLD membership report message to the corresponding IPv6
multicast group.
Proper setting of the maximum response delay of MLD query messages not only
allows hosts to respond to MLD query messages quickly, but also avoids bursts of
MLD traffic on the network caused by reports simultaneously sent by a large
number of hosts when corresponding timers expire simultaneously.
■ For MLD general queries, you can configure the maximum response delay to fill
their Maximum Response Delay field.
■ For MLD multicast-address-specific query messages, you can configure the last
listener query interval to fill their Maximum Response Delay field. That is to say,
the maximum response time of MLD general query messages equals the last
listener query interval.
When multiple multicast routers exist on the same subnet, the MLD querier is
responsible for sending MLD query messages. If a non-querier router receives no
MLD query message from the querier before the other querier present timer
expires, it will assume that the querier has failed and will initiate a new querier
election process. Otherwise, the non-querier will reset its timeout time.
Configure MLD timers globally
Follow these steps to configure MLD timers globally:
Configure MLD timers on an interface
Follow these steps to configure MLD timers on an interface
To do... Use the command... Remarks
Enter system view system-view -
Enter MLD view mld -
Configure the query interval timer query interval Optional
125 seconds by default.
Configure the maximum
response delay for MLD
general query messages
max-response-time interval Optional
10 seconds by default
Configure the last listener
query interval
lastlistener-queryinterval
interval
Optional
1 second by default
Configure the last listener
query count
robust-count robust-value Optional
2 times by default
Configure the other querier
present interval
timer
other-querier-present
interval
Optional
For the default, see Note
below.
To do... Use the command... Remarks
Enter system view system-view -
Enter VLAN interface view interface interface-type
interface-number
-
Configure the query interval mld timer query interval Optional
125 seconds by default.