User Guide for Cisco Secure Access Control Server - Stewing Home

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ACS Internal Database Replication 8-6 User Guide for Cisco Secure Access Control Server 4.2 Chapter 8 System Configuration: Advanced Replication only occurs when the database of the primary ACS has changed since the last successful replication, regardless of how frequently replication is scheduled to occur. When a scheduled or manually started replication begins, the primary ACS automatically aborts replication if its database has not changed since the last successful replication. Tip You can force replication to occur by making one change to a user or group profile, such as changing a password or modifying a RADIUS attribute. Replication to secondary ACSs occurs sequentially in the order listed in the Replication list under Replication Partners on the ACS Database Replication page. You must configure a secondary ACS that is receiving replicated components to accept database replication from the primary ACS. To configure a secondary ACS for database replication, see Configuring a Secondary ACS, page 8-11. ACS does not support bidirectional database replication. The secondary ACS that receives the replicated components verifies that the primary ACS is not on its Replication list. If not, the secondary ACS accepts the replicated components. If so, it rejects the components. For all components (except for Network Access Profiles), if you replicate user accounts, ensure that you name external database configurations identically on primary and secondary ACSs. A replicated user account retains its association with the database that is assigned to provide authentication or posture validation service, regardless of whether a database configuration of the same name exists on the secondary ACS. For example, if user account is associated with a database named WestCoast LDAP; on the primary ACS, the replicated user account on all secondary ACSs remains associated with an external user database named WestCoast LDAP even if you have not configured an LDAP database instance of that name. For all components (except for Network Access Profiles), in order to replicate user and group settings that use user-defined RADIUS vendor and VSAs, you must manually add the user-defined RADIUS vendor and VSA definitions on primary and secondary ACSs, ensuring that the RADIUS vendor slots that the user-defined RADIUS vendors occupy are identical on each ACS. After you have done so, replication of settings by using user-defined RADIUS vendors and VSAs is supported. For more information about user-defined RADIUS vendors and VSAs, see Creating, Reading, Updating and Deleting Actions for AAA clients, page 8-22. Database Replication Versus Database Backup Do not confuse database replication with system backup. Database replication does not replace System Backup. While both features protect against partial or complete server loss, each feature addresses the issue in a different way: System Backup archives data into a format that you can later use to restore the configuration if the system fails or the data becomes corrupted. The backup data is stored on the local hard drive, and can be copied and removed from the system for long-term storage. You can store several generations of database backup files. You use ACS Database Replication to copy various components of the ACS internal database to other ACSs. This method can help you plan a failover AAA architecture, and reduce the complexity of your configuration and maintenance tasks. While unlikely, it is possible that ACS Database Replication can propagate a corrupted database to the ACSs that generate your backup files. OL-14386-02
Chapter 8 System Configuration: Advanced OL-14386-02 ACS Internal Database Replication Caution Because the possibility of replicating a corrupted database always exists, we strongly recommend that you implement a backup plan, especially in mission-critical environments. For more information about backing up the ACS internal database, see ACS Backup, page 7-8. For additional information (ACS for Windows), see Appendix C, “CSUtil Database Utility.” Database Replication Logging Replication Options ACS logs all replication events—regardless of whether they are successful—in two files. The: Windows Event Log Replication Components Options Database Replication report To view the Windows Event Log, use the Windows administration utilities. You can view recent reports in the Reports and Activity section of ACS. For more information about ACS reports, see Chapter 1, “Overview.” The ACS web interface provides three sets of options for configuring ACS Database Replication. This section contains: Replication Components Options, page 8-7 Outbound Replication Options, page 8-9 Inbound Replication Options, page 8-10 You can specify the ACS internal database components that an ACS sends as a primary ACS and the components that it receives as a secondary ACS. For increased security, you might want to have one ACS always be the sender and the other ACSs always be the receivers. You can use this method to ensure that all your ACSs are configured identically. Note The ACS internal database components that a secondary ACS receives overwrite the ACS internal database components on the secondary ACS. Any information that is unique to the overwritten database component is lost. For example, if the Receive check box is selected for the User and Group Database, any existing user or group records are lost on replication when the new ACS internal database is received. Table 8-1 describes the Replication Components table on the ACS Database Replication page and describes the component options that are replicated. User Guide for Cisco Secure Access Control Server 4.2 8-7
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