Setup and Install

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The amount of entries returned for a query
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Availability of system resources (CPU and memory)
In some environments the LDAP servers may be highly utilized and therefore less responsive than
the DSS server(s). In that case, if direct LDAP addressing is enabled on the devices it may slow down
the responsiveness of the address book for users. Further, having a large number of devices directly
access LDAP servers may contribute to slow down those servers even more. It may therefore be
worth considering using LDAP Replication in DSS instead.
Duplication
Most devices do not support filtering duplicates. This means that if different address books contain
the exact same entry, it will be shown x times in the address book view at the device.
Summary
When to use direct LDAP Addressing:
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When LDAP infrastructure is very responsive and has the required bandwidth.
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When different devices connected to the same DSS server require access to different parts of
the LDAP address book.
When to use LDAP Replication
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When LDAP infrastructure does not have required bandwidth, or when additional utilization of
these servers is not desired.
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When all devices connected to the same DSS server require access to the same parts of the
LDAP address book.
When to use both
● When there is a common LDAP search context which is required by all devices and some
devices also require specific search contexts. In this case the common search contexts would be
made available through LDAP Replication and the required devices would be configured for
direct LDAP Addressing for only the additional search context(s).
Device differences in addressing
Latest generation devices use an internal database for caching and sorting e-mail addresses from the
LDAP directory. This functionality allows these devices to auto-complete addresses in the e-mail
application even though the LDAP directory might be unsorted.
Where addresses are stored
DSS accesses and stores different types of address books. E-mail addresses may be stored in the
SQL database on the DSS server, or on the device, or in an external source such as LDAP and
Exchange.
If LDAP is enabled on a device, then the LDAP address book will be stored in the database on that
device. If LDAP is not enabled on the device, then the device will use the LDAP address book stored
40 Chapter 2 Theory of operations ENWW