Anonymous (not verified) Mon, 01/12/2009 - 14:09
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The security appliance sends hello packets over the failover interface to monitor unit health. If the standby unit does not receive a hello packet from the active unit for two consecutive polling periods, it sends additional testing packets through the remaining device interfaces. If a hello packet or a response to the interface test packets is not received within the specified hold time, the standby unit becomes active.


http://www.cisco.com/en/US/docs/security/asa/asa80/configuration/guide/failover.html#wp1142481

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