Cisco 7604 Configuration Guide - Page 271
Determining Which Type of Failover to Use, Regular and Stateful Failover
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Chapter 14 Configuring Failover Understanding Failover Table 14-2 Failover Behavior for Active/Active Failover (continued) Failure Event State link failed Policy Active Group Action No failover No action Failover link failed during operation No failover n/a Standby Group Action No action n/a Notes State information will become out of date, and sessions will be terminated if a failover occurs. Each unit marks the failover interface as failed. 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. Determining Which Type of Failover to Use The type of failover you choose depends upon your FWSM configuration and how you plan to use FWSM. If you are running FWSM in single mode, then you can only use Active/Standby failover; Active/Active failover is only available to FWSMs running in multiple context mode. If you are running the FWSM in multiple context mode, then you can configure either Active/Active failover or Active/Standby failover. If you are using an upstream router to provide load balancing, use Active/Active failover. If you do not want to provide load balancing, use either Active/Standby or Active/Active failover. Table 14-3 provides a comparison of some of the features supported by each type of failover configuration. Table 14-3 Failover Configuration Feature Support Feature Single Context Mode Multiple Context Mode Load Balancing Network Configurations Unit Failover Failover of Groups of Contexts Failover of Individual Contexts Active/Active No Yes Yes Yes Yes No Active/Standby Yes Yes No Yes No No Regular and Stateful Failover FWSM supports two types of failover, regular and stateful. This section includes the following topics: • Regular Failover, page 14-18 • Stateful Failover, page 14-18 OL-20748-01 Catalyst 6500 Series Switch and Cisco 7600 Series Router Firewall Services Module Configuration Guide using ASDM 14-17
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