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failover: Added additional information about health checks (#1629)

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Added additional information about health checks
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aapostoliuk 2025-04-29 16:35:29 +03:00 committed by GitHub
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1 changed files with 7 additions and 2 deletions
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docs/configuration/protocols/failover.rst
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@ -3,7 +3,7 @@ Failover
########
Failover routes are manually configured routes, but they only install
to the routing table if the health-check target is alive.
to the routing table as kernel routes if the health-check target is alive.
If the target is not alive the route is removed from the routing table
until the target becomes available.
@ -28,7 +28,12 @@ Failover Routes
.. cfgcmd:: set protocols failover route <subnet> next-hop <address> check
type <protocol>
Defines protocols for checking ARP, ICMP, TCP
Defines protocols for checking ARP, ICMP, TCP.
* ICMP probe sends 2 ICMP request packets with a response timeout of 1 second.
If one ICMP response is received, the health check is successful.
* ARP probe sends 2 ARP requests with a response timeout of 1 second.
If one response is received, the health check is successful.
* TCP probe checks whether the destination port is open.
Default is ``icmp``.