Supported Platforms
heartbeat-interval
Syntax
Hierarchy Level
Release Information
Statement introduced in Junos OS Release 9. Statement updated in Junos OS Release 10.4.
Description
Set the interval between the periodic signals broadcast to the devices in a chassis cluster to indicate that the active node is operational.
The heartbeat-interval option works in combination with the heartbeat-threshold option to define the wait time before failover is triggered in a chassis cluster. The default values of these options produce a wait time of 3 seconds. In a large configuration approaching full capacity on an SRX5400 or SRX5600 or SRX5800 device, however, we recommend that you increase the failover wait time to 5 seconds. For a large configuration on an SRX3400 or SRX3600 device, increase the failover wait time to 8 seconds.
For example, a heartbeat-threshold of 3 and a heartbeat-interval of 1000 milliseconds result in a total wait of 3 seconds before failover is triggered. To increase this wait to 5 seconds, you could increase the heartbeat-threshold, the heartbeat-interval, or both. A heartbeat-threshold of 5 and a heartbeat-interval of 1000 milliseconds would yield a wait time of 5 seconds. Setting the heartbeat-threshold to 4 and the heartbeat-interval to 1250 milliseconds would also yield a wait time of 5 seconds.
 | Note: In a chassis cluster scaling environment, the heartbeat-threshold must always be set to 8. |
Options
milliseconds —Time interval between any two heartbeat messages.
Range: 1000 through 2000 milliseconds
Default: 1000 milliseconds
Required Privilege Level
interface—To view this statement in the configuration.
interface-control—To add this statement to the configuration.
