Cisco 7604 Configuration Guide - Page 266
Active/Active Failover, Failover Actions
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Understanding Failover Chapter 14 Configuring Failover 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 with Active/Standby failover. Table 14-1 shows the failover action for each failure event. For each failure event, the table shows the 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 14-1 Failover Behavior Failure Event Active unit failed (power or hardware) Policy Failover Active Action n/a Formerly active unit recovers Standby unit failed (power or hardware) No failover No failover Become standby Mark standby as failed Failover link failed during operation No failover Mark failover interface as failed Failover link failed at startup No failover Mark failover interface as failed State link failed No failover No action Interface failure on active unit Failover above threshold Interface failure on standby No failover unit above threshold Mark active as failed No action Standby Action Become active Mark active as failed No action n/a Mark failover interface as failed Become active No action Become active Notes No hello messages are received on any monitored interface or the failover link. None. When the standby unit is marked as failed, then the active unit will not attempt to fail over, even if the interface failure threshold is surpassed. You should restore the failover link as soon as possible because the unit cannot fail over to the standby unit while the failover link is down. If the failover link is down at startup, both units will become active. State information will become out of date, and sessions will be terminated if a failover occurs. None. Mark standby as failed When the standby unit is marked as failed, then the active unit will not attempt to fail over even if the interface failure threshold is surpassed. Active/Active Failover This section describes Active/Active failover. This section includes the following topics: • Active/Active Failover Overview, page 14-13 • Primary/Secondary Status and Active/Standby Status, page 14-13 • Device Initialization and Configuration Synchronization, page 14-14 • Command Replication, page 14-14 14-12 Catalyst 6500 Series Switch and Cisco 7600 Series Router Firewall Services Module Configuration Guide using ASDM OL-20748-01
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