Cisco 7604 Configuration Guide - Page 270
Failover Actions, Failure Event, Policy, Active Group, Action, Standby Group, Notes
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Understanding Failover Chapter 14 Configuring Failover Failover Actions Failover is triggered at the failover group level when one of the following events occurs: • Too many monitored interfaces in the contexts that belong to the failover group fail. • The no failover active group group_id command is entered. You configure the failover threshold for each failover group by specifying the number or percentage of interfaces within the failover group that must fail before the group fails. Because a failover group can contain multiple contexts, and each context can contain multiple interfaces, it is possible for all interfaces in a single context to fail without causing the associated failover group to fail. See the "Failover Health Monitoring" section on page 14-19 for more information about interface and unit monitoring. In an Active/Active failover configuration, failover occurs on a failover group basis, not a system basis. For example, if you designate both failover groups as active on the primary unit, and failover group 1 fails, then failover group 2 remains active on the primary unit while failover group 1 becomes active on the secondary unit. Note When configuring Active/Active failover, make sure that the combined traffic for both units is within the capacity of each unit. Table 14-2 shows the failover action for each failure event. For each failure event, the policy (whether or not failover occurs), actions for the active failover group, and actions for the standby failover group are given. Table 14-2 Failover Behavior for Active/Active Failover Failure Event A unit experiences a power or software failure Interface failure on active failover group above threshold Interface failure on standby failover group above threshold Formerly active failover group recovers Failover link failed at startup Policy Active Group Action Standby Group Action Notes Failover Become standby Become active Mark as failed Mark active as failed When a unit in a failover pair fails, any active failover groups on that unit are marked as failed and become active on the peer unit. Failover Mark active Become active None. group as failed No failover No action Mark standby group as failed When the standby failover group is marked as failed, then the active failover group will not attempt to fail over, even if the interface failure threshold is surpassed. No failover No action No action Unless configured with the preempt command, the failover groups remain active on their current unit. No failover Become active Become active If the failover link is down at startup, both failover groups on both units will become active. 14-16 Catalyst 6500 Series Switch and Cisco 7600 Series Router Firewall Services Module Configuration Guide using ASDM OL-20748-01
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