Cisco NAC3350-PROF-K9 - NAC Profiler Server Installation Manual page 152

Installing a Clean Access Server High Availability Pair
Cisco strongly recommends you do not use the serial interface on the NAC-3315/3355/3395 for the HA
Note
heartbeat function. Although this element still appears in the CAM web console, the Heartbeat Serial
Interface feature is being deprecated in a future Cisco NAC Appliance release. (The associated
Heartbeat Timeout value remains a valid configuration point, however, for deployments using optional
Heartbeat UDP interfaces 2 and 3.)
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d. Configure the SSL Certificate
7.
Figure 4-15
Cisco NAC Appliance Hardware Installation Guide
4-32
Heartbeat Timeout (seconds): Choose a value greater than 15 seconds.
To avoid a potentially serious network issue where two CASs deployed as an HA pair reboot
Note
at the same time (in the event power returning after an outage, for example) and both come
up as the active CAS in the HA pair, Cisco recommends setting the Heartbeat Timeout to
a value greater than 30 seconds. The possible network implication in this scenario is that the
to "active" CASs can introduce a Layer 2 broadcast loop that almost immediately brings
down the network.
Another method you can use to avoid this scenario is to ensure you use an additional
Ethernet interface link (eth2, eth3) for heartbeat monitoring between your CAS Ha pair
nodes. See Heartbeat UDP Interface 2 and Heartbeat UDP interface 3, above and
Configuring Additional NIC Cards, page
Update: Click to update the HA configuration information for the CAS without rebooting it.
Reboot: This is used to reboot the CAS at the end of HA-Primary CAS configuration. (Do not click
Reboot at this point.)
Now configure the SSL certificate for the HA-Primary CAS. Navigate to Administration > SSL >
X509 Certificate.
Administration > SSL > X509 Certificate
Chapter 4 Configuring High Availability (HA)
3-37, for more information.
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