Chapter 4 Managing Device and Credentials
DCR Architecture
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User Guide for CiscoWorks Common Services
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Master DCR
The Master DCR server refers to the master repository of device list and
credential data. The Master hosts the authoritative, or a master-list of all devices
and their credentials. All other DCRs in the same management domain which are
running in Slave mode normally shares this list.
There is only one Master repository for each management domain, and it contains
the most up-to-date device list and credentials.
Slave DCR
The Slave DCR refers to a repository that is an exact replica of the Master.
DCR Slaves are slave instance of DCR in other servers and provide transparent
access to applications installed in those servers.
Any change to the repository data occurs first in the Master, and those changes are
propagated to multiple Slaves. There can be more than one Slave in a management
domain.
The Slave:
•
Maintains an exact replica of the data managed by the Master for the
management domain.
•
Has a mechanism to keep itself in sync with the Master.
•
Will first update Master and then update its own repository data. This is in
case of repository data updates.
Standalone DCR
In Standalone mode, DCR maintains an independent repository of device list and
credential data. It does not participate in a management domain and its data is not
shared with any other DCR. It does not communicate with or contain registration
information about any other Master, Slave, or Standalone DCR.
DCR running in Master or Slave mode always has an associated DCR Group ID
that indicates the Server's management domain. This Group ID is generated when
a DCR is set to Master mode, and communicated to all Slaves later assigned to
that Master.