Extreme Networks Px Series manual Configuring Cookie Stickiness

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•A three-way TCP handshake is established between the Px series application switch and server 3.

•The application switch makes the following entry in its database:

	Source	Destination	Real Server
Cookie	IP Address	VIP Address	IP Address

	65.11.11.11	64.1.1.7	10.1.1.3

•The application switch forwards the first data request from the client to server 3 (E).

•Server 3 sends a cookie to the client (via the application switch) (F). The cookie contains randomly generated information that is unique for this client, such as a session identifier:

sessionID=37654

•The client sends another data request to www.buystuff.com (via the application switch).

•The application switch examines the source IP address of the client and looks for a match in the database table.

•The application switch completes the database record by entering the cookie information:

	Source	Destination	Real Server
Cookie	IP Address	VIP Address	IP Address

sessionID=37654	65.11.11.11	64.1.1.7	10.1.1.3

•Each subsequent request sent from the client to the website contains the cookie.

•The application switch examines the cookie, looks up the forwarding information in the database, and sends each request from this client to server 3.

Learned cookie persistence mode is based on the assumption that the client IP address will not change between the first and second data requests sent to the website. After the cookie is established and entered in the table, the source IP address of the client is no longer examined, and can change as frequently as required by the ISP.

Configuring Cookie Stickiness

To configure cookie persistence you must add information to the end of the pattern-rule definition for the default domain. This means that even if no domain or URL switching

6-12	Px Series Application Switch Installation and Configuration Guide

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Contents Published April Part number 100101-00 Rev Page Contents Installing the PxM Application Switch Module Configuring Servers and Services Index Index of Commands Preface IntroductionIcon Alerts you to ConventionsText Conventions Convention DescriptionRelated Publications Preface Server Load Balancing Concepts Purpose of Server Load BalancingTerms 1Conceptual view of server load balancingLoad Balancing Modes Layer 4 Load BalancingLayer 7 Load Balancing and Content Analysis 2Single client-server transaction using layer3Establishing a layer 7 request Getting Started on Load Balancing Configuration Port RewriteGetting Started on Load Balancing Configuration Page Overview of the SummitPx1 Application Switch Installing the SummitPx1 Application SwitchSummitPx1 Front View 1Px series application switch LEDs Color Indicates2DB-9 Adapter Pinouts SummitPx1 Application Switch Rear ViewSignal Description To DB-9Determining the Location Installing the SummitPx1 Application SwitchRack Mounting Powering On the SummitPx1 Free-StandingSetting Up Console Communication Configuring Switch IP Parameters Configuring the 10/100 Ethernet Management Port Installing the PxM Application Switch Module Installing I/O ModulesRemoving I/O Modules Removing I/O Modules Page Managing the Switch Syntax Symbols Using the Command-Line InterfaceAbbreviated Syntax and Command Completion 1Command Syntax SymbolsSpecifying Text Values Symbol DescriptionLine-Editing Keys 2Line-Editing KeysCommand History Configuring Management AccessPrompt Text Changing the Default Passwords Creating Accounts Modifying AccountsCommand Description Managing the PxMConfiguring VLANs Setting Description System Configuring Snmp4SNMP Configuration Settings ContactConfiguring DNS Client Services SettingDescriptionUsing Secure Shell 2 SSH2 5DNS Client Configuration CommandsEnabling SSH2 for Inbound Switch Access Config ssh2 keyUsing SCP2 from an External SSH2 Client SSH2 Client Functions on the Switch Showing CPU Load UtilitiesChecking Basic Connectivity Logging Configuring a Startup Banner Message Starting the GlobalPx Content Director AgentExample Configuration Internet DNS serverFollowing commands configure all system-related facilities Page Configuring Servers and Services Configuring Real ServersConfiguring Server Groups Configuring Virtual Services Layer 7 Virtual Services Layer 4 Port-based Load BalancingConfiguring Traffic Tagging 1Tag Specifications Configuration ExampleTag Specification Description Tag Range Configuration Example Page Choosing Policies, Persistence Modes, and NAT Scheduling Policies1Scheduling Policies Persistence ModesSpecifier Policy Description Client IP Persistence Mode UDP Flow Persistence1Client IP persistence mode Configuring Client IP Stickiness Cookie Persistence Modes2Self-identifying cookie persistence mode Persistence Modes Hashed Cookie Persistence Session Learned Cookie Persistence Mode 4Learned cookie persistence mode Configuring Cookie Stickiness SSL Session Identifier Persistence Full-NAT Mode NAT ModesServer-only Half-NAT Mode Configuring Full-NAT Mode and Proxy IP AddressesConfiguring Half-NAT Mode Config source-flow name next-hop gateway-mode ip Real Syslog server SummitPx1 Configuration Example Page URL Switching Domain and URL SwitchingDomain Switching 1Typical switching scenario2Domain switching example Configuring URL Switching URL Switching3Simple URL switching example 4More Complicated URL switching example 5Hierarchical approach to pattern rules 1Wildcard Combinations Creating Domain and URL Switching RulesWildcard Example Definition Modifying Existing URL Rules and Domains Application Servers Management net Configuration Example Page Configuring Redundancy Using Vrrp with the SummitPx1Adding and Configuring VRRPs Give backup systems lower prioritiesUsing Vrrp in Existing Redundant Networks 1Application switch using multiple VLANs Vrrp Automatic SynchronizationFollowing commands can be passed from master to backup Configuring Redundancy for the PxM Using Esrp with the PxMConfiguring the PxM for Multiple VLANs For SW2Configuring a Default Gateway Health Checks OverviewServer Startup Pacing Health Checking Procedure Timers and Counters Configuring Health ChecksTypes of Health Checks You can disable health checks for a server group Page 1Statistics Display Commands Monitoring the SwitchShowing Traffic Statistics Displays packet-level counters for Showing Configuration Details 2Configuration Display CommandsConfiguration Displays Status Displays SummitPx128 # show server detailsShow health Information Column DescriptionManaging and Troubleshooting Operation 5Management and Troubleshooting CommandsCommandDescription Index EsrpHttp GET AUX Page Index of Commands