Concept Guide

show ha heartbeat counters
show ha heartbeat counters
Description
This command displays statistics for the High Availability extended controller capacity feature.
Syntax
No parameters.
Usage Guidelines
The high availability inter-controller heartbeat feature allows for faster AP failover from an active controller to a
standby controller, especially in situations where the active controller reboots or loses connectivity to the
network.
The inter-controller heartbeat feature works independently from the AP mechanism that sends heartbeats
from the AP to the controller. If enabled, the inter-controller heartbeat feature supersedes the AP's heartbeat
to its controller. As a result, if a standby controller detects missed inter-controller heartbeats from the active
controller, it triggers its standby APs to failover to the standby controller, even if those APshave not detected
any missed heartbeats between the APs and their active controller. Use this feature with caution in deployments
where the active and standby controllers are separated over high-latency WAN links.
When this feature is enabled, the standby controller starts sending regular heartbeats to an AP's active
controller as soon as the AP has an UP status on the standby controller. By default, the standby controller
sends heartbeat messages every 100ms. If the active controller becomes unreachable for the number of
heartbeats defined by the heartbeat threshold (by default, 5 missed heartbeats), the standby controller
immediately detects this error, and informs the APs using the standby controller to fail over from the active
controller to the standby controller .
This feature is disabled by default. It can be used in conjunction with the high availability state synchronization
feature only in topologies that use a single active and standby controller, or a pair dual-mode active controllers
that act as standby controllers for each other. High availability inter-controller heartbeats can be enabled and
configured in the high-availability group profile using the WebUI or Command-Line interfaces.
Examples
The following command displays high-availability heartbeat statistics for the high availability group default.
(host) (HA group information "default") #show ha heartbeat counters
Heartbeat stats
---------------
Controller IP Active Reference Count Total Heartbeat Sent Total Heartbeat Received
------------- ---------------------- -------------------- ------------------------
172.14.0.2 1 101 101
Last Missed Heartbeat (Count) Time
----------------------------------
0
The output of this command includes the following parameters:
Dell Networking W-Series ArubaOS 6.5.x | Reference Guide show ha heartbeat counters | 1510