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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 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 If the target is not alive the route is removed from the routing table
until the target becomes available. until the target becomes available.
@ -28,7 +28,12 @@ Failover Routes
.. cfgcmd:: set protocols failover route <subnet> next-hop <address> check .. cfgcmd:: set protocols failover route <subnet> next-hop <address> check
type <protocol> 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``. Default is ``icmp``.