AudioCodes Mediant 500L - Page 261

Version 7.2 261 Mediant 500L Gateway & E-SBC
User's Manual 15. Services
If an LDAP query is required for an Attribute of a key that is already cached with that same
Attribute, instead of sending a query to the LDAP server, the device uses the cache.
However, if an LDAP query is required for an Attribute that does not appear for the cached
key, the device queries the LDAP server and then saves the new Attribute (and response)
in the cache for that key. When the device queries new Attributes for a cached key, the
device also includes already cached Attributes of the key, while adhering to the maximum
number of allowed saved Attributes (see note below), with preference to the new Attributes.
In other words, if the cached key already contains the maximum Attributes and an LDAP
query is required for a new Attribute, the device sends an LDAP query to the server for the
new Attribute and for the five most recent Attributes already cached with the key. Upon the
LDAP response, the new Attribute replaces the oldest cached Attribute while the values of
the other Attributes are refreshed with the new response. The following table shows an
example of different scenarios of LDAP queries of a cached key whose cached Attributes
include a, b , c, and d, where a is the oldest and d the most recent Attribute:
Table 15-12: Example of LDAP Query for Cached Attributes
Attributes Requested in New
LDAP Query for Cached Key
Attributes Se
nt in LDAP Query
to LDAP Server
Attributes Saved in Cache after
LDAP Response
e
e, a, b, c, d e, a, b, c, d
e, f e, f, a, b, c, d e, f, a, b, c, d
e, f, g, h, i e, f, g, h,i, a e, f, g, h,i, a
e, f, g, h, i, j e, f, g, h, i, j e, f, g, h, i, j
Note:
• The LDAP Cache feature is applicable only to LDAP-based SIP queries (Control).
• The maximum LDAP cache size is 10,000 entries.
• The device can save up to six LDAP Attributes in the cache per user (search
LDAP key).
• The device also saves in the cache queried Attributes that do not have any values
in the LDAP server.
•
The following procedure describes how to configure the device's LDAP cache through the
Web interface. For a full description of the cache parameters, see ''LDAP Parameters'' on
page 1248.
 To enable and configure the LDAP cache:
1. Open the LDAP Settings page (Setup menu > IP Network tab > RADIUS & LDAP
folder > LDAP Settings).
Figure 15-27: Enabling LDAP Cache
2. Under the Cache group, do the following: