This chapter covers the concept of failover, its configurations, and redundancy in a Firewall Services Module (FWSM). Planning failure scenarios is always a good practice when designing a network solution. Redundancy for disaster recovery should always be a part of the network. Likewise, redundancy is also needed for firewalls.
The two types of modes for redundancy in FWSM are as follows:
• Active/Standby mode
• Active/Active mode
The sections that follow cover the two modes in detail.
The firewall has an active unit and a nonactive unit. The active unit is called a primary firewall and the nonactive unit is called a secondary firewall. ...