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FAILOVER INTRODUCTION
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Failover is a Cisco-proprietary feature unique to the security appliances Failover provides redundancy between paired appliances: one appliance backs up another appliance This redundancy provides resiliency in your network And depending on the failover type you use and how you implement failover, the failover process can be, in most situations, transparent to your users and hosts This section will introduce failover concepts I ll discuss the two types of failover (hardware and stateful), the requirements you must meet to set up failover, the restrictions you ll face when implementing failover, and how to handle software upgrades for appliances paired together in a failover configuration
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There are two failover types: hardware failover (sometimes called chassis or stateless failover) and stateful failover Of the two, when failover was originally introduced, only hardware failover was available Starting in version 6, stateful failover was introduced Hardware failover only provides for hardware redundancy in other words, a physical failover of one of the appliances The configurations between the appliances are synchronized, but nothing else So, for example, if a connection were being handled by one appliance and it failed, the other appliance could take over the traffic forwarding for the failed appliance But since the original connection wasn t replicated to the second appliance, the connection fails: all active connections will be lost and must be rebuilt through the second appliance For hardware failover, a failover link is required between the appliances, which is discussed later in the Failover Cabling section Stateful failover provides both hardware and stateful redundancy Besides the configuration of the appliances being synchronized, other information is also synchronized
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This additional information includes the conn table, the xlate table, the current date and time, the layer 2 MAC address table (if the appliances are in transparent mode), SIP signaling sessions, and VPN connections The latter is new in version 70, but only if implementing active/standby failover (see the Failover Implementations section) When implementing stateful failover, you ll need two links between the appliances: a failover link and a stateful link (discussed in more depth in the Failover Cabling section)
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To implement failover, you have to have the correct appliances and the appropriate licensing, and to match up the hardware and software on the units The following sections will discuss these items in more depth
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Not all appliances support failover All the ASAs support failover; however, the ASA 5505 doesn t support active/active failover (see the Failover Implementations section) Of the PIXs, only the 515s and higher support failover The Firewall Services Module (FWSM) also supports failover NOTE The FWSM is a card for the Catalyst 6500 and the router 7600 chassis Its operating system is based on the same operating system used by the appliances Unlike the appliances, it has no physical interfaces Instead, all its interaction is with its connected switch or router via trunked VLANs Most of the configuration is very similar to the appliances, but some, like the initial setup of the logical/ VLAN interfaces, is different A discussion on using and configuring the FWSM is beyond this book
Hardware, Software, and Configuration Requirements
For the hardware between the two appliances, the only thing that doesn t have to be the same is the flash memory size all other components must be the same For example, you could use two 5510s, but not a 5510 and a 5520 You could use two ASA 5540s, but not if one had an IPS card and the other didn t Basically, with the exception of flash, the hardware between the two units must be identical: same models, same interfaces and cards, same amount of RAM, and so on If you had PIXs running version 6 or earlier, the two PIXs in failover had to be running the same OS image and the same PIX Device Manager (PDM) image (ASDM is the replacement for PDM and is discussed in 27) For example, if one PIX were running version 63(4) and the other were running 63(5), failover wouldn t work they would have to be running exactly the same version of software in version 6 and earlier Starting in version 7, Cisco slightly loosened the software requirements: the minor releases had to match up, but not subreleases within a minor release For example, if one appliance were running 71(1) and the other 71(2), the two appliances could participate in failover; however, if one were running 70(4) and the other were running 71(2), failover would fail
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