Installation guide

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Device Manager Guide, Cisco ACE 4700 Series Application Control Engine Appliance
OL-26645-02
Chapter 6 Configuring Real Servers and Server Farms
Configuring Health Monitoring
To configure probe headers and expect statuses for HTTP probes, see the following topics:
• Configuring Headers for HTTP and HTTPS Probes, page 6-66
• Configuring Health Monitoring Expect Status, page 6-67
HTTPS Probe Attributes
Note Click More Settings to access the additional attributes for the HTTPS probe type. By default, ACE
appliance Device Manager hides the probe attributes with default values and the probe attributes which
are not commonly used.
Hash Check the Hash check box to indicate that the ACE is to use an MD5 hash
for an HTTP GET probe. Clear the Hash check box to indicate that the ACE
should not use an MD5 hash for an HTTP GET probe.
Hash String This field appears if the Hash check box is selected.
Enter the 32-bit hash value that the ACE is to compare with the hash that is
generated from the HTTP page sent by the server. If you do not provide this
value, the ACE generates a value the first time it queries the server, stores
this value, and matches this value with other responses from the server. A
successful comparison causes the probe to maintain an Alive state.
Enter the MD5 hash value as a quoted or unquoted hexadecimal string with
16 characters.
Table 6-17 HTTP Probe Attributes (continued)
Field Action
Table 6-18 HTTPS Probe Attributes
Field Action
Port Enter the port number that the probe is to use. By default, the probe uses port
inheritance to determine the port number. For more information, see the
general attribute Port field description.
Request Method Type Select the type of HTTP request method that is to be used for this probe:
• N/A—This option is not defined.
• Get—The HTTP request method is a GET with a URL of “/”. This
request method directs the server to get the page, and the ACE calculates
a hash value for the content of the page. If the page content information
changes, the hash value no longer matches the original hash value and
the ACE assumes the service is down. This is the default request
method.
• Head—The server is to only get the header for the page. Using this
method can prevent the ACE from assuming that the service is down due
to changed content and therefore changed hash values.