Chapter 7 Configuring Redundant ACE Appliances
Configuring Tracking and Failure Detection
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Cisco 4700 Series Application Control Engine Appliance Administration Guide
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The
number
argument specifies the priority of the probes configured for the
gateway or host on the standby member. Enter a priority value as an integer from
0 to 255. The default is 0. Higher values indicate higher priorities. Assign a
priority value based on the relative importance of the gateway or host that the
probes are tracking. If all the probes go down, the ACE decrements the priority of
the FT group on the standby member by the value of the
number
argument.
For example, enter:
host1/Admin(config-ft-track-host)#
peer priority 25
To reset the multiple-probe priority to the default value of 0 on the standby
member, enter:
host1/Admin(config-ft-track-host)#
no peer priority 25
Example of a Tracking Configuration for a Gateway
The following example demonstrates a tracking configuration for a gateway on
the active member of an FT group:
ft track host TRACK_GATEWAY
track-host 192.161.100.1
probe GATEWAY_TRACK1 priority 10
probe GATEWAY_TRACK2 priority 20
priority 50
In this configuration example, if the
gateway_track1
probe goes down, the ACE
reduces the priority of the FT group on the active member by 10. If the
gateway_track2
probe goes down, the ACE reduces the priority of the FT group
on the active member by 20. If both probes go down, the ACE reduces the priority
of the FT group on the active member by 50. If at any time the priority of the FT
group on the active member falls below the priority of the FT group on the standby
member, a switchover occurs.
To configure tracking on the standby member, use the
peer
commands described
in the
“Configuring a Probe on the Standby Member for Host Tracking”
and the
“Configuring a Priority on the Standby Member for Multiple Probes”
sections.
