mld timer other-querier-present
Function
The mld timer other-querier-present command sets the other querier present timer on an interface.
The undo mld timer other-querier-present command restores the default value of the other querier present timer on an interface.
By default, the Keepalive period of the other queriers is calculated as follows:
Other querier present timer = Robustness variable x Interval for sending MLD General Query messages + 1/2 x Maximum response time
If the default values of the robustness variable, interval for sending MLD General Query messages, and maximum response time are used, the other querier present timer value is 255 seconds.
Parameters
| Parameter | Description | Value |
|---|---|---|
| interval | Specifies the other querier present timer. | The value is an integer that ranges from 60 to 300, in seconds. |
Views
GE interface view, XGE interface view, MultiGE interface view, 25GE interface view, 40GE interface view, 100GE interface view, Eth-Trunk interface view, VLANIF interface view, loopback interface view
Usage Guidelines
Usage Scenario
When a user network segment connects to multiple Layer 3 multicast devices, only one Layer 3 multicast device is elected as the MLD querier to send Query messages to hosts on the network segment. To create and maintain normal group memberships, non-queriers running MLD start the other querier present timer after they fail in the querier election. If the non-queriers do not receive Query messages from the querier before the timer times out, they consider the querier failed and start a new querier election.
Prerequisites
Layer 3 IPv6 multicast has been enabled using the multicast ipv6 routing-enable command in the system view.
Precautions
The function of the mld timer other-querier-present command is the same as that of the timer other-querier-present (MLD view) command used in the MLD view. The configuration in the MLD view is globally valid, whereas the configuration in the interface view takes effect only for the specified interface. The configuration in the interface view takes precedence over the configuration in the MLD view. The configuration in the MLD view is used only when no configuration is performed in the interface view.
If the other querier present timer is shorter than the interval for sending General Query messages, the querier election is triggered frequently.
Example
# On VLANIF100, set the other querier present timer to 200 seconds.
<HUAWEI> system-view [HUAWEI] multicast ipv6 routing-enable [HUAWEI] interface vlanif 100 [HUAWEI-Vlanif100] mld timer other-querier-present 200
<HUAWEI> system-view [HUAWEI] multicast ipv6 routing-enable [HUAWEI] interface gigabitethernet 0/0/1 [HUAWEI-GigabitEthernet0/0/1] undo portswitch [HUAWEI-GigabitEthernet0/0/1] mld timer other-querier-present 200