Cisco NAC3350-PROF-K9 Hardware Installation Guide - Page 135

Heartbeat Timeout, Update, Reboot

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Chapter 4 Configuring High Availability (HA) Installing a Clean Access Manager High Availability Pair Note 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. Warning When connecting high availability (failover) pairs via serial cable, BIOS redirection to the serial port 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 Supported Hardware and System Requirements for Cisco NAC Appliance (Cisco Clean Access) for more information. Step 14 Step 15 Click Update and then Reboot. 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 that the admin console for the standby CAm displays limited management modules (Figure 4-7 and Figure 4-8). Figure 4-7 Standby Web Admin Console Example-Summary Page OL-20326-01 Cisco NAC Appliance Hardware Installation Guide 4-15

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4-15
Cisco NAC Appliance Hardware Installation Guide
OL-20326-01
Chapter 4
Configuring High Availability (HA)
Installing a Clean Access Manager High Availability Pair
Note
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.
Warning
When connecting high availability (failover) pairs via serial cable, BIOS redirection to the serial port
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
Supported Hardware and System
Requirements for Cisco NAC Appliance (Cisco Clean Access)
for more information.
Step 14
Click
Update
and then
Reboot
.
When the standby CAM starts up, it automatically synchronizes its database with the active CAM.
Step 15
Finally, open the admin console for the standby again and complete the configuration as follows. Notice
that the admin console for the standby CAm displays limited management modules (
Figure 4-7
and
Figure 4-8
).
Figure 4-7
Standby Web Admin Console Example—Summary Page