isis timer hello
Function
The isis timer hello command configures the interval for sending Hello packets on an interface.
The undo isis timer hello command restores the default value.
By default, the interval for sending Hello packets is 10 seconds.
Format
isis timer hello hello-interval [ level-1 | level-2 ] [ conservative ]
undo isis timer hello [ hello-interval ] [ level-1 | level-2 ] [ conservative ]
Parameters
| Parameter | Description | Value |
|---|---|---|
| hello-interval | Specifies the interval for sending Hello packets. | The value is an integer that ranges from 3 to 255 seconds. By default, it is 10 seconds. |
| level-1 | Indicates the interval of Level-1 for sending Hello packets. | - |
| level-2 | Indicates the interval of Level-2 for sending Hello packets. NOTE:
If neither Level-1 nor Level-2 is specified, the default level is Level-1 and Level-2. Parameters level-1 and level-2 are configured only on a broadcast interface that is enabled with IS-IS. |
- |
| conservative | Indicates the conservative mode of the dead timer. If the conservative mode is configured, the value configured for the dead timer takes effect even when the value is less than 10s. | - |
Views
Ethernet interface view, Ethernet sub-interface view, Eth-Trunk interface view, Eth-Trunk sub-interface view, Tunnel interface view, Loopback interface view, Dialer interface view, VLANIF interface view, Virtual-Template interface view
Usage Guidelines
On a broadcast link, Level-1 and Level-2 Hello packets are sent respectively and their intervals should be set respectively. On a P2P link, there is one type of Hello packets. Therefore, neither level-1 nor level-2 is required. The shorter the interval, the more system resources used to send Hello packets. The interval should therefore be set according to the actual conditions.
If a broadcast interface is emulated as a P2P interface through the isis circuit-type command or then restored to the broadcast interface through the undo isis circuit-type command, the interval for sending IS-IS Hello packets is restored to the default value.