Determining Which Type Of Failover To Use; Regular And Stateful Failover - Cisco 7604 Configuration Manual

Chapter 14 Configuring Failover
Table 14-2 Failover Behavior for Active/Active Failover (continued)
Failure Event
State link failed
Failover link failed during operation

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
configuration.
Table 14-3
Feature
Single Context Mode
Multiple Context Mode
Load Balancing Network Configurations
Unit Failover
Failover of Groups of Contexts
Failover of Individual Contexts

Regular and Stateful Failover

FWSM supports two types of failover, regular and stateful. This section includes the following topics:
•
•
Catalyst 6500 Series Switch and Cisco 7600 Series Router Firewall Services Module Configuration Guide using ASDM
OL-20748-01
Policy
No failover No action
No failover n/a
provides a comparison of some of the features supported by each type of failover
Failover Configuration Feature Support
Regular Failover, page 14-18
Stateful Failover, page 14-18
Active Group Standby Group
Action Action
No action
n/a
Active/Active
No
Yes
Yes
Yes
Yes
No
Understanding Failover
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State information will become out
of date, and sessions will be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.
Active/Standby
Yes
Yes
No
Yes
No
No
14-17