Link-Detect Interfaces; Active/Standby Status - Cisco NAC3350-PROF-K9 - NAC Profiler Server Installation Manual

Chapter 4 Configuring High Availability (HA)

Link-Detect Interfaces

The /etc/ha.d/linkdetect.conf file is useful if your network topology restricts configuring external
(pingable) interfaces for Link-detect functionality between your CAS HA pair appliances. This file
specifies the CAS network interfaces (eth0, eth1, or both) to monitor for Link-detect functionality. If a
monitored interface loses connectivity with its associated external interface, the active CAS fails over
and the standby CAS assumes the active role.
To create and/or update the linkdetect.conf file in the CAS:
Log in to the CAS direct console CLI and direct console as the root user.
Step 1
Step 2 Navigate to the /etc/ha.d/ directory on the CAS.
Step 3 Using a standard text editor (like vi), edit the linkdetect.conf file so that it contains the interface names
you want to monitor, or (if the linkdetect.conf file does not currently exist on the CAS) add the
linkdetect.conf file to this directory.
Verify the contents of the file:
Step 4
[root@rjcas_1 ha.d]# more linkdetect.conf
# The following network interfaces will be monitored for link healthiness
# The active CAS will change to standby mode when any link failure is detected
#
eth0
eth1
Enable the new function by stopping and restarting CAS services with the service perfigo stop and
Step 5
service perfigo start commands.
In the above linkdetect.conf file example, both the eth0 and eth1 interfaces on the CAS are monitored
for network connectivity.
Note Any other CAS interfaces specified in the linkdetect.conf file (like eth2 or eth3, for example) are
ignored for purposes of Link-detect behavior.

Active/Standby Status

The following example shows how to use the CLI to determine the runtime status (active or standby) of
each CAS in the HA pair. You can find the fostate.sh command in the /perfigo/common/bin/ directory
on new and upgraded CASs.
1.
OL-20326-01
log_badpack false
warntime 10
debug 0
debugfile /var/log/ha-debug
logfile /var/log/ha-log
watchdog /dev/watchdog
node rjcas_1
node rjcas_2
Cd to
/perfigo/common/bin/
[root@rjcas_1 bin]# ./fostate.sh
, and run the fostate.sh script on the first CAS:
Cisco NAC Appliance Hardware Installation Guide
Useful CLI Commands for HA
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