Cisco ASA 5505 Configuration Manual page 1222

Information About Active/Standby Failover
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Failover Actions
In Active/Standby failover, failover occurs on a unit basis. Even on systems running in multiple context
mode, you cannot fail over individual or groups of contexts.
Table 59-2
failover policy (failover or no failover), the action taken by the active unit, the action taken by the
standby unit, and any special notes about the failover condition and actions.
Table 59-2 Failover Behavior
Failure Event
Active unit failed (power or
hardware)
Formerly active unit recovers No failover
Standby unit failed (power or
hardware)
Failover link failed during
operation
Failover link failed at startup
Stateful Failover link failed
Interface failure on active unit
above threshold
Interface failure on standby
unit above threshold
Cisco ASA 5500 Series Configuration Guide using ASDM
59-4
The unit has a software failure.
Too many monitored interfaces fail.
You force a failover (see Forcing Failover, page
shows the failover action for each failure event. For each failure event, the table shows the
Policy Active Action
Failover n/a
Become standby
No failover Mark standby as
failed
No failover Mark failover
interface as failed
No failover Mark failover
interface as failed
No failover No action
Failover Mark active as
failed
No failover No action
Chapter 59
59-12).
Standby Action Notes
Become active No hello messages are received on
any monitored interface or the
Mark active as
failover link.
failed
No action None.
n/a When the standby unit is marked as
failed, then the active unit does not
attempt to fail over, even if the
interface failure threshold is
surpassed.
Mark failover You should restore the failover link
interface as failed as soon as possible because the
unit cannot fail over to the standby
unit while the failover link is down.
Become active If the failover link is down at
startup, both units become active.
No action State information becomes out of
date, and sessions are terminated if
a failover occurs.
Become active None.
Mark standby as When the standby unit is marked as
failed failed, then the active unit does not
attempt to fail over even if the
interface failure threshold is
surpassed.
Configuring Active/Standby Failover
OL-20339-01