Cisco Systems 3.5 manual How Replication Works, Replication Data Flow, Master Server

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Radius Server is Off-line

Chapter 4 Understanding Replication

How Replication Works

When there is a configuration change, the master server propagates the change set to all member servers over the network. All member servers have to update their configuration after receiving the change set notifications from master server. Propagating the change set to a member serve involves multiple packet transfer from the master server to the member because the master serve has to convey all the configuration changes to the member. The number of packets to be transferred depends on the size of the change set.

After receiving a change set notification, the member server will go off-line before applying the change set received from master server. This state is indicated by the log message

in name_radius_1_log file. When the change set is successfully applied, the member server goes up automatically. This is indicated by the log message Radius Server is On-Linein name_radius_1_log file. When the member server goes off-line to apply the change set, no incoming packets are processed.

Due to the number of packets to be transferred in the change set and the amount of time the member server will be offline updating its databasepoints, Cisco recommends that you use multiple save commands rather than a large configuration change with one save command. You can also minimize the number of changes that occur in a replication interval by modifying either the RepTransactionArchiveLimit or the RepTransactionSyncInterval, or both of these properties. For example, instead of using the default value of 100 for the RepTransactionArchiveLimit, you might change it to 20.

How Replication Works

This section describes the flow of a simple replication as it occurs under normal conditions.

Replication Data Flow

The following sections describe data flow on the master server and the slave server.

Master Server

The following describes the data flow for the master server:

Step 1 The administrator makes a change to the master server’s configuration using the aregcmd command line interface (CLI) and issues a save command.

Step 2 After the changes are successfully validated, the changes are stored in the Access Registrar database. Step 3 aregcmd then notifies the Access Registrar server executing on the master of the configuration change.

Step 4 The Access Registrar server then updates its version of the configuration stored in memory. (This is called hot-configbecause it happens while the server is running and processing requests.)

Step 5 The Access Registrar server first copies the changes pertaining to the aregcmd save, also known as a transaction to its replication archive, then transmits the transaction to the slave server for processing.

Step 6 In aregcmd, the prompt returns indicating that the save has completed successfully, the transaction has been archived, and the transaction has been transmitted to the slaves.

Cisco Access Registrar 3.5 Concepts and Reference Guide

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Contents Cisco Access Registrar 3.5 Concepts and Reference Guide Corporate HeadquartersCisco Access Registrar 3.5 Concepts and Reference Guide N T E N T S IiiSession-Service Service Step and Radius-Session Service Replication’s Impact on Request Processing IPAddress Port Understanding Snmp Accounting Start Data Flow ViiViii Obtaining Documentation World Wide WebObtaining Technical Assistance Ordering DocumentationDocumentation Feedback Cisco.comTechnical Assistance Center Contacting TAC by Using the Cisco TAC WebsiteContacting TAC by Telephone Xii Overview Radius ProtocolSteps to Connection Packet Exchange Between User, NAS, and RadiusPacket Contents Types of Radius MessagesProxy Servers Attribute DictionaryBasic Authentication and Authorization Proxying to an Ldap Server for AuthenticationOverview Basic Authentication and Authorization Understanding Cisco Access Registrar Cisco Access Registrar HierarchyServices UserLists and GroupsProfiles ScriptsSession Management Using Resource Managers Program Flow Cisco AR Directory StructureSubdirectory Description Scripting Points Client or NAS Scripting PointsCisco AR Server Action Explanation Action ExplanationAuthentication and/or Authorization Scripting Points Radius/Advanced/RequireNASsBehindProxyBeInClieSession Management Failover by the NAS and Session ManagementScript Processing Hierarchy Authentication/Authorization ScriptsIncoming Scripts Overview Cross Server Session and Resource ManagementOutgoing Scripts Session-Service Service Step and Radius-Session Service Configuring a Front Line Cisco Access RegistrarConfigure Central AR OL-2683-02 ACMEOutgoingScript Using Cisco AR ScriptsAltigaIncomingScript AuthorizeService AltigaOutgoingScriptANAAAOutgoing AscendIncomingScriptAuthorizeTelnet CabletronIncomingCabletronOutgoing CiscoIncomingExecTimeRule ExecDNISRuleExecFilterRule ExecNASIPRuleLDAPOutage MapSourceIPAddressParseAAARealm ParseAAASRealmParseServiceAndAAARealmHints ParseServiceAndAAASRealmHintsParseServiceAndAARealmHints ParseServiceAndAASRealmHintsParseServiceHints ParseTranslationGroupsByCLIDParseTranslationGroupsByDNIS ParseTranslationGroupsByRealmUSROutgoingScript Understanding Replication Replication OverviewReplication Data Flow How Replication WorksMaster Server Security Replication ArchiveEnsuring Data Integrity Slave ServerTransaction Order Transaction Data VerificationAutomatic Resynchronization Replication Configuration Settings Understanding Hot-ConfigurationFull Resynchronization Replication’s Impact on Request ProcessingRepType RepTransactionSyncIntervalRepTransactionArchiveLimit MasterRepIPAddress RepPortRepSecret RepIPMasterRep Members Subdirectory Rep Members/Slave1Name IPAddressOverview Supported MIBsSnmp Traps RADIUS-AUTH-SERVER-MIBSupported Traps CarServerStartCarServerStop CarInputQueueFullCarOtherAuthServerResponding CarOtherAuthServerNotRespondingCarOtherAccServerNotResponding Configuring Traps CarOtherAccServerRespondingCarAccountingLoggingFailure Directories SearchedConfiguration File Types Switching Configuration Files in Mid-FileCommunity String OL-2683-02 Prepaid Billing Solution Measurements and Component Actions Configuring Prepaid Billing Generic Call Flow Call Flow DetailsAccess-Request Authentication Attribute Number Attribute Name DescriptionAccess-Request Authorization Access-Accept AuthenticationAccess-Accept Authorization Data Flow Accounting StartAttribute Number Attribute Name Access-Request Quota Depleted Accept-Accept Quota DepletedAccounting Stop Session End Accounting Response Final StatusVendor-Specific Attributes Source VSA Name Type Call Flow DescriptionTotal Volume quota received by Crbprivate O S S a R Y GL-1Scalable wholesale access/open access solution GL-2GL-3 GL-4 GL-5 GL-6 GL-7 GL-8 GL-9 GL-10 Radius IN-1RFC IN-2IN-3 IN-4
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3.5 specifications

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