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Chapter 4
Configuring High Availability (HA)
Note
When connecting high availability (failover) pairs via serial cable, BIOS redirection to the serial port
Warning
must be disabled for Cisco NAC Appliance CAMs/CASs and any other server hardware platform that
supports the BIOS redirection to serial port functionality. See
Requirements for Cisco NAC Appliance (Cisco Clean Access)
Click Update and then Reboot.
Step 14
When the standby CAM starts up, it automatically synchronizes its database with the active CAM.
Finally, open the admin console for the standby again and complete the configuration as follows. Notice
Step 15
that the admin console for the standby CAm displays limited management modules
Figure
Figure 4-7
OL-20326-01
Starting from Cisco NAC Appliance Release 4.6(1), the Heartbeat Timeout default value has
been increased to 30 seconds to help accommodate CAM HA peers located in relatively distant
locations on the network, where latency issues might cause a standby HA CAM to assume the
active role when it has not received heartbeat packets from its HA peer within the specified
Heartbeat Timeout period. In the resulting network scenario, you could potentially end up with
two "active" CAMs performing Cisco NAC Appliance functions, requiring you to reboot both
CAMs to re-establish the correct primary/secondary HA peer relationship.
4-8).
Standby Web Admin Console Example—Summary Page
Installing a Clean Access Manager High Availability Pair
Supported Hardware and System
for more information.
Cisco NAC Appliance Hardware Installation Guide
(Figure 4-7
and
4-15
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