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[Archive] What is the failover criteria in a Unified Failover configuration?

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Article ID: KB9268 KB Last Updated: 27 Aug 2010Version: 3.0
Summary:
What will trigger a failover in a Unified Failover setup?
Symptoms:

What is considered as failover criteria in a Unified Failover configuration?

Solution:

The following criteria is used to failover a device in a Unified Failover configuration:

  1. A link failure on an interface configured for failover. 
  2. On a standby box, if the administrator configures "force master".
  3. A Master box (with "Force Master" not set) will failover if it finds that one of its peer has "Force Master" set.
  4. A Master box (with "Force Master" not set) will failover if it finds that one of its peer with "Force Master" has become Master and the peer's Node ID is smaller.
  5. If any of the supported service fails on a Master box, then it fails over to Standby mode. 
  6. If a service goes down on a Master, ForceMaster box, then it fails over and becomes standby.
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