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5-15
Device Manager Guide, Cisco ACE 4700 Series Application Control Engine Appliance
OL-26645-02
Chapter 5 Configuring Virtual Servers
Configuring Virtual Servers
KAL-AP-TAG Name The KAL-AP-TAG feature allows the Cisco Global Site Selector (GSS)
proprietary KAL-AP protocol to extract load and availability information
from the ACE when a firewall is positioned between the GSS and the ACE.
This feature allows you to configure a tag (name) per VIP for a maximum
of 4,096 tags on an ACE. This feature does not replace the tag per domain
feature. For more information about this feature, see the Configuring Health
Monitoring chapter in the Server Load-Balancing Guide, Cisco ACE
Application Control Engine.
In the KAL-AP-TAG Name field, enter the name as an unquoted text string
with no spaces and a maximum of 76 alphanumeric characters.
The following scenarios are not supported and will result in an error:
You cannot configure a tag name for a VIP that already has a tag
configuration as part of a different policy configuration.
You cannot associate the same tag name with more than one VIP.
You cannot associate the same tag name with a domain and a VIP.
You cannot assign two different tags to two different Layer 3 class maps
that have the same VIP, but different port numbers. The KAL-AP
protocol considers these class maps to have the same VIP and calculates
the load for both Layer 3 rules together when the GSS queries the VIP.
Kal-AP Primary Out of
Service
Check this box for the ACE to notify the Global Site Selector (GSS) that the
primary server farm is down when the backup server farm is in use.
By default, when you configure a redirect server farm as a backup server
farm on the ACE and the primary server farm fails, the backup server farm
redirects the client requests to another data center. However, the VIP
remains in the INSERVICE state.
When you configure the ACE to communicate with a GSS, it provides
information for server availability. When a backup server is in use after the
primary server farm is down and this feature is enabled, the ACE informs
the GSS that the VIP for the primary server farm is out of service by
returning a load value of 255. The GSS recognizes that the primary server
farm is down and sends future DNS requests with the IP address of the other
data center.
Clear this check box to disable this feature.
DNS Parameter Map This field appears if DNS is the selected protocol over UDP.
Select an existing DNS parameter map or click *New* to create a new one:
If you select an existing parameter map, you can view, modify, or
duplicate the existing configuration. See the “Shared Objects and
Virtual Servers” section on page 5-9 for more information about
modifying shared objects.
If you click *New*, the DNS Parameter Map configuration pane
appears. Configure the DNS parameter map as described in Table 8-11.
Table 5-2 Virtual Server Properties – Advanced View (continued)
Field Description
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