Cisco IOS Server Load Balancing Configuration Guide, Cisco IOS Release .
Cisco IOS Server Load BalancingConfiguration Guide,Cisco IOS Release 15.0(1)SMarch 31, 2011Americas HeadquartersCisco Systems, Inc.170 West Tasman DriveSan Jose, CA 95134-1706USAhttp://www.cisco.comTel: 408 526-4000800 553-NETS (6387)Fax: 408 527-0883
THE SPECIFICATIONS AND INFORMATION REGARDING THE PRODUCTS IN THIS MANUAL ARE SUBJECT TO CHANGE WITHOUT NOTICE. ALLSTATEMENTS, INFORMATION, AND RECOMMENDATIONS IN THIS MANUAL ARE BELIEVED TO BE ACCURATE BUT ARE PRESENTED WITHOUTWARRANTY OF ANY KIND, EXPRESS OR IMPLIED. USERS MUST TAKE FULL RESPONSIBILITY FOR THEIR APPLICATION OF ANY PRODUCTS.THE SOFTWARE LICENSE AND LIMITED WARRANTY FOR THE ACCOMPANYING PRODUCT ARE SET FORTH IN THE INFORMATION PACKET THATSHIPPED WITH THE PRODUCT AND ARE INCORPORATED HEREIN BY THIS REFERENCE. IF YOU ARE UNABLE TO LOCATE THE SOFTWARE LICENSEOR LIMITED WARRANTY, CONTACT YOUR CISCO REPRESENTATIVE FOR A COPY.The Cisco implementation of TCP header compression is an adaptation of a program developed by the University of California, Berkeley (UCB) as part of UCB’s publicdomain version of the UNIX operating system. All rights reserved. Copyright 1981, Regents of the University of California.NOTWITHSTANDING ANY OTHER WARRANTY HEREIN, ALL DOCUMENT FILES AND SOFTWARE OF THESE SUPPLIERS ARE PROVIDED “AS IS” WITHALL FAULTS. CISCO AND THE ABOVE-NAMED SUPPLIERS DISCLAIM ALL WARRANTIES, EXPRESSED OR IMPLIED, INCLUDING, WITHOUTLIMITATION, THOSE OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OR ARISING FROM A COURSE OFDEALING, USAGE, OR TRADE PRACTICE.IN NO EVENT SHALL CISCO OR ITS SUPPLIERS BE LIABLE FOR ANY INDIRECT, SPECIAL, CONSEQUENTIAL, OR INCIDENTAL DAMAGES, INCLUDING,WITHOUT LIMITATION, LOST PROFITS OR LOSS OR DAMAGE TO DATA ARISING OUT OF THE USE OR INABILITY TO USE THIS MANUAL, EVEN IF CISCOOR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.Cisco and the Cisco Logo are trademarks of Cisco Systems, Inc. and/or its affiliates in the U.S. and other countries. A listing of Cisco's trademarks can be found atwww.cisco.com/go/trademarks. Third party trademarks mentioned are the property of their respective owners. The use of the word partner does not imply a partnershiprelationship between Cisco and any other company. (1005R)Any Internet Protocol (IP) addresses and phone numbers used in this document are not intended to be actual addresses and phone numbers. Any examples, command displayoutput, network topology diagrams, and other figures included in the document are shown for illustrative purposes only. Any use of actual IP addresses or phone numbers inillustrative content is unintentional and coincidental.Cisco IOS Server Load Balancing Configuration Guide 2011 Cisco Systems, Inc. All rights reserved.
X M L C o n v e r s i o n D r a f t - 0 3 / 0 7 / 2 0 11CONTENTSCHAPTER1Cisco IOS SLB Features Roadmap1-1CHAPTER2Information About Cisco IOS SLB2-1Overview2-1Benefits of IOS SLB2-3Cisco IOS SLB Features 2-4Routing Features 2-4Algorithms for Server Load Balancing 2-5Bind ID Support 2-6Client-Assigned Load Balancing 2-7Connection Rate Limiting 2-7Content Flow Monitor Support 2-7Delayed Removal of TCP Connection Context 2-7Firewall Load Balancing 2-7GTP IMSI Sticky Database 2-8Home Agent Director 2-9Interface Awareness 2-9Maximum Connections 2-9Multiple Firewall Farm Support 2-9Network Address Translation 2-10Port-Bound Servers 2-13Route Health Injection 2-13Sticky Connections 2-13TCP Session Reassignment 2-14Transparent Web Cache Load Balancing 2-15Security Features 2-15Alternate IP Addresses 2-15Avoiding Attacks on Server Farms and Firewall Farms 2-15Slow Start 2-16SynGuard 2-16Server Failure Detection and Recovery Features 2-16Automatic Server Failure Detection 2-16Automatic Unfail 2-17Backup Server Farms 2-17Dynamic Feedback Protocol (DFP) Agent Subsystem Support 2-17Cisco IOS Server Load Balancing Configuration GuideOL-24559-01iii
ContentsX M L C o n v e r s i o n D r a f t - 0 3 / 0 7 / 2 0 11DFP for Cisco IOS SLB 2-17GGSN-IOS SLB Messaging 2-18INOP REAL State for Virtual Servers 2-19Probes 2-19Protocol Support Features 2-20Protocol Support 2-21AAA Load Balancing 2-21Audio and Video Load Balancing 2-22VPN Server Load Balancing 2-22Redundancy Features 2-22Stateless Backup 2-22Stateful Backup 2-22Active Standby 2-23Exchange Director Features 2-23ASN Load Balancing 2-23GPRS Load Balancing 2-24GPRS Load Balancing without GTP Cause Code Inspection 2-25GPRS Load Balancing with GTP Cause Code Inspection 2-25Dual-Stack Support for GTP Load Balancing 2-26Home Agent Director 2-26KeepAlive Application Protocol (KAL-AP) Agent Support 2-27Relative KAL-AP Load Value 2-27Absolute KAL-AP Load Value 2-27RADIUS Load Balancing 2-28RADIUS Load Balancing Accelerated Data Plane Forwarding 2-29WAP Load Balancing 2-30Stateful Backup of Redundant Route Processors 2-31Flow Persistence 2-31Restrictions for Cisco IOS SLBCHAPTER32-31How to Configure IOS SLB Features3-1How to Configure Required and Optional IOS SLB Functions 3-2How to Configure a Server Farm and a Real Server 3-2How to Configure a Virtual Server 3-6How to Verify a Virtual Server 3-12How to Verify a Server Farm 3-13How to Verify Clients 3-13How to Verify IOS SLB Connectivity 3-14How to Configure Firewall Load Balancing3-15Cisco IOS Server Load Balancing Configuration GuideivOL-24559-01
ContentsX M L C o n v e r s i o n D r a f t - 0 3 / 0 7 / 2 0 11How to Configure a Firewall Farm 3-15How to Verify a Firewall Farm 3-20How to Verify Firewall Connectivity 3-21How to Configure a Probe 3-22How to Configure a Custom UDP Probe 3-23How to Configure a DNS Probe 3-24How to Configure an HTTP Probe 3-25How to Configure a Ping Probe 3-27How to Configure a TCP Probe 3-28How to Configure a WSP Probe 3-29How to Associate a Probe 3-30How to Verify a Probe 3-31How to Configure DFP3-32GPRS Load Balancing Configuration Task List 3-33How to Configure a GSN Idle Timer 3-35GGSN-IOS SLB Messaging Task List3-35How to Configure GPRS Load Balancing MapsHow to Configure KAL-AP Agent Support3-373-40RADIUS Load Balancing Configuration Task List 3-41How to Enable IOS SLB to Inspect Packets for RADIUS Framed-IP Sticky Routing 3-45How to Configure RADIUS Load Balancing Maps 3-46How to Configure RADIUS Load Balancing Accelerated Data Plane Forwarding 3-48Prerequisites 3-48Exchange Director for mSEF Configuration Task List 3-51RADIUS Configuration for the Exchange Director 3-51Firewall Configuration for the Exchange Director 3-53How to Configure a Firewall Farm 3-54How to Verify a Firewall Farm 3-57How to Verify Firewall Connectivity 3-58How to Configure a Probe 3-59How to Configure a Wildcard Search 3-60How to Configure Protocol-Level Purging of MLS entries 3-60How to Configure Connection Purge Request Behavior 3-60How to Configure Sticky Connection Purge Request Behavior 3-60VPN Server Load Balancing Configuration Task ListASN Load Balancing Configuration Task List3-62Home Agent Director Configuration Task List3-63How to Configure NAT3-613-65Cisco IOS Server Load Balancing Configuration GuideOL-24559-01v
ContentsX M L C o n v e r s i o n D r a f t - 0 3 / 0 7 / 2 0 11How to Configure Static NAT3-66Stateless Backup Configuration Task List 3-66How to Verify the Stateless Backup Configuration3-67Stateful Backup of Redundant Route Processors Configuration Task ListHow to Configure Database Entries3-69How to Configure Buffers for the Fragment DatabaseHow to Clear Databases and CountersHow to Configure a Wildcard Search3-703-713-72How to Configure Protocol-Level Purging of MLS EntriesHow to Purge and Reassign Connections3-733-74How to Disable Automatic Server Failure Detection3-75How to Monitor and Maintain the Cisco IOS SLB FeatureCHAPTER4Configuration Examples for IOS SLB3-683-764-1Example: How to Configure a Basic IOS SLB NetworkServer Farm Configuration 4-2Virtual Server Configuration 4-3Restricted Client Configuration 4-44-2Example: How to Configure a Complete IOS SLB Network4-4Examples: How to Configure IOS SLB with Firewall Load Balancing 4-5Example: How to Configure IOS SLB with Basic Firewall Load Balancing 4-5Internal Firewall Load-Balancing Device 4-6External Firewall Load-Balancing Device 4-7Example: How to Configure IOS SLB with Server Load Balancing and Firewall Load BalancingInternal Server and Firewall Load-Balancing Device 4-8External Firewall Load-Balancing Device 4-9Example: How to Configure IOS SLB with Multiple Firewall Farms 4-9Internal Firewall Load-Balancing Device 4-10External Firewall Load-Balancing Device 4-11Example: How to Configure IOS SLB with Dual Firewall Load Balancing “Sandwich” 4-11Examples: How to Configure IOS SLB with Probes 4-13Example: How to Configure IOS SLB with Ping and HTTP ProbesExample: How to Configure IOS SLB with Routed Probe 4-15Example: How to Configure a Layer 3 Switch with IOS SLB4-74-134-16Examples: How to Configure IOS SLB with NAT and Static NATExample: How to Configure IOS SLB with NAT 4-18Switch A Configuration Statements 4-19Switch B Configuration Statements 4-204-18Cisco IOS Server Load Balancing Configuration GuideviOL-24559-01
ContentsX M L C o n v e r s i o n D r a f t - 0 3 / 0 7 / 2 0 11Switch C Configuration Statements 4-20Example: How to Configure IOS SLB with Static NAT4-21Examples: How to Configure IOS SLB with Redundancy 4-22Examples: How to Configure IOS SLB with Stateless Backup 4-22Example: How to Configure Dynamic Routing and Trunking 4-23Example: How to Configure Dynamic Routing and No Trunking 4-24Example: How to Configure Static Routing and Trunking 4-26Example: How to Configure Static Routing and No Trunking 4-28Example: How to Configure IOS SLB with Stateful Backup 4-30Switch SLB1 Configuration Statements 4-31Switch SLB2 Configuration Statements 4-32Example: How to Configure IOS SLB with Stateful Backup of Redundant Route ProcessorsExample: How to Configure IOS SLB with Active Standby 4-33SLB 1 Configuration Statements 4-34SLB 2 Configuration Statements 4-35Access Router Configuration Statements 4-36Example: How to Configure IOS SLB with Redistribution of Static RoutesRouting Information Protocol (RIP) 4-38Open Shortest Path First (OSPF) 4-38Interior Gateway Routing Protocol (IGRP) 4-38Enhanced Interior Gateway Routing Protocol (Enhanced IGRP) 4-384-37Example: How to Configure IOS SLB with WAP and UDP Load BalancingExample: How to Balance WAP Flows on UDP Port 9201 4-40Example: How to Balance WAP Flows on UDP Port 9203 4-404-394-33Examples: How to Configure IOS SLB with Route Health Injection 4-41Example: How to Configure Two Distributed Sites with One Web Server Each 4-41Example: How to Configure Two Distributed Sites with Two Web Servers Each 4-42Example: How to Configure Two Distributed Sites with One Web Server and a Backup IOS SLB SwitchEach 4-43Examples: How to Configure IOS SLB with GPRS Load Balancing 4-44Example: How to Configure IOS SLB with GPRS Load Balancing Without GTP Cause CodeInspection 4-44IOS SLB Configuration Statements 4-45GGSN1 Configuration Statements 4-46GGSN2 Configuration Statements 4-47GGSN3 Configuration Statements 4-48Example: How to Configure IOS SLB with GPRS Load Balancing and NAT 4-48IOS SLB Configuration Statements 4-49GGSN1 Configuration Statements 4-50GGSN2 Configuration Statements 4-50Cisco IOS Server Load Balancing Configuration GuideOL-24559-01vii
ContentsX M L C o n v e r s i o n D r a f t - 0 3 / 0 7 / 2 0 11GGSN3 Configuration Statements 4-51Example: How to Configure IOS SLB with GPRS Load Balancing, NAT, and GTP Cause CodeInspection 4-52IOS SLB Configuration Statements 4-52Example: How to Configure IOS SLB with GPRS Load Balancing Maps 4-53Example: How to Configure IOS SLB with Dual-Stack Addresses for GTP Load Balancing 4-54Example: How to Configure IOS SLB with VPN Server Load Balancing4-55Examples: How to Configure IOS SLB with RADIUS Load Balancing 4-56Example: How to Configure IOS SLB with RADIUS Load Balancing for a GPRS Network 4-56Example: How to Configure IOS SLB with RADIUS Load Balancing for a Simple IP CDMA2000Network 4-58Example: How to Configure IOS SLB with RADIUS Load Balancing for a Mobile IP CDMA2000Network 4-59Example: How to Configure IOS SLB with RADIUS Load Balancing for Multiple Service GatewayFarms 4-60Example: How to Configure IOS SLB with RADIUS Load Balancing/Firewall Load Balancing“Sandwich” 4-61Example: How to Configure IOS SLB with RADIUS Load Balancing Maps 4-62Example: How to Configure IOS SLB with RADIUS Load Balancing Accelerated Data PlaneForwarding 4-63Example: How to Configure IOS SLB with Home Agent DirectorExample: How to Configure IOS SLB with Sticky Connections4-654-65Example: How to Configure IOS SLB with GTP IMSI Sticky DatabaseExample: How to Configure IOS SLB with ASN Sticky Database4-664-66Example: How to Configure IOS SLB with Transparent Web Cache Load BalancingExample: How to Configure IOS SLB with KAL-AP AgentGSS 4-68Site-1: IOS SLB - CHICAGO 4-69GGSN-1 4-69GGSN-2 4-69Site-2: IOS SLB - NEWYORK 4-69GGSN-1 4-70GGSN-2 4-70CHAPTER5Troubleshooting IOS SLBCHAPTER6Additional References for IOS SLBRelated DocumentsStandards4-674-675-16-16-16-1Cisco IOS Server Load Balancing Configuration GuideviiiOL-24559-01
ContentsX M L C o n v e r s i o n D r a f t - 0 3 / 0 7 / 2 0 11MIBs6-2RFCs6-2Technical Assistance6-2Cisco IOS Server Load Balancing Configuration GuideOL-24559-01ix
ContentsX M L C o n v e r s i o n D r a f t - 0 3 / 0 7 / 2 0 11Cisco IOS Server Load Balancing Configuration GuidexOL-24559-01
X M L C o n v e r s i o n D r a f t - 0 3 / 0 7 / 2 0 11CH A P T E R1Cisco IOS SLB Features RoadmapThis feature roadmap lists the Cisco IOS features documented in the Cisco IOS Server Load BalancingConfiguration Guide and maps them to the sections in which they appear. Only features that wereintroduced or modified in Cisco IOS Release 12.2(1) or a later release appear in the table.The roadmap is organized alphabetically by feature name. Find the feature name you are searching forand click the URL in the “Where Documented” column to access the section documenting that feature.Feature and Release SupportTable 1-1 lists IOS SLB feature support for the following Cisco IOS software release trains: Cisco IOS Release 12.2(1) Cisco IOS Release 12.2(14)S Cisco IOS Releases 12.2(14)ZA2, 12.2(14)ZA4, 12.2(14)ZA5, 12.2(14)ZA6 Cisco IOS Releases 12.2(17d)SXB, 12.2(17d)SXB1 Cisco IOS Release 12.2(17d)SXD Cisco IOS Release 12.2(17d)SXE Cisco IOS Releases 12.2(18)SXF, 12.2(18)SXF5, 12.2(18)SXF7 Cisco IOS Release 12.2(33)SRB Cisco IOS Releases 12.2(33)SRC, 12.2(33)SRC1 Cisco IOS Release 12.2(33)SRE Cisco IOS Release 15.0(1)SUse Cisco Feature Navigator to find information about platform support and software image support.Cisco Feature Navigator enables you to determine which software images support a specific softwarerelease, feature set, or platform. To access Cisco Feature Navigator, go to http://www.cisco.com/go/cfn.An account on Cisco.com is not required.NoteTable 1-1 lists only the Cisco IOS software release that introduced support for a given feature in a givenCisco IOS software release train. Unless noted otherwise, subsequent releases of that Cisco IOSsoftware release train also support that feature.Not all commands may be available in your Cisco IOS software release. For release information about aspecific command, refer to the Cisco IOS IP Application Services Command Reference.Cisco IOS Server Load Balancing Configuration Guide1-1
Chapter 1Cisco IOS SLB Features RoadmapX M L C o n v e r s i o n D r a f t - 0 3 / 0 7 / 2 0 11Table 1-1Feature Information for IOS SLBReleasesFeature NameFeature Description12.2(1)IOS Server Load Balancing(IOS SLB)The IOS SLB feature is an IOS-basedThe following section providessolution that provides load balancing for a information about this feature:variety of networked devices and services. Overview12.2(14)SAAA Load BalancingIOS SLB provides RADIUSload-balancing capabilities for RADIUSauthentication, authorization, andaccounting (AAA) servers.The following section providesinformation about this feature:Active standby enables two IOS SLBs toload-balance the same virtual IP addresswhile at the same time acting as backupsfor each other.The following sections provideinformation about this feature:12.2(1)Active Standby12.2(1)Algorithms for Server LoadBalancingIOS SLB provides the followingload-balancing algorithms:Where Documented AAA Load Balancing Active Standby Stateless BackupConfiguration Task List Example: How toConfigure IOS SLB withActive StandbyThe following sections provideinformation about this feature: Weighted Round Robin Algorithm Weighted Least ConnectionsAlgorithmAlgorithms for ServerLoad Balancing How to Configure a ServerFarm and a Real Server Route Map Algorithm12.2(1)Alternate IP AddressesIOS SLB enables you to telnet to theThe following section providesload-balancing device using an alternate IP information about this feature:address. Alternate IP Addresses12.2(33)SRC1ASN Load BalancingIOS SLB provides load balancing across a The following sections provideset of ASN gateways. The cluster ofinformation about this feature:gateways appears to the base station as one Restrictions forASN gateway.Cisco IOS SLB ASN Load Balancing ASN Load BalancingConfiguration Task ListThe following commands weremodified by this feature:debug ip slb, idle (virtualserver), show ip slb sessions,show ip slb stats, show ip slbvservers, virtualCisco IOS Server Load Balancing Configuration Guide1-2
Chapter 1Cisco IOS SLB Features RoadmapX M L C o n v e r s i o n D r a f t - 0 3 / 0 7 / 2 0 11Table 1-1Feature Information for IOS SLB (continued)ReleasesFeature NameFeature DescriptionWhere Documented12.2(33)SREASN Load Balancing:Stateful and Sticky SupportAccess Service Network (ASN) LoadBalancing supports stateful redundancyand sticky connections.The following sections provideinformation about this feature: Restrictions forCisco IOS SLB ASN Load Balancing ASN Load BalancingConfiguration Task ListThe following commands arenew for this feature:clear ip slb sticky asn msid,gw port, show ip slb stickyThe following commands weremodified by this feature:debug ip slb, failaction(server farm), idle (virtualserver), show ip slb sticky,sticky (virtual server)12.2(1)Audio and Video LoadBalancingIOS SLB can balance RealAudio andRealVideo streams through Real-TimeStreaming Protocol (RTSP), for serversrunning RealNetworks applications.The following section providesinformation about this feature: Audio and Video LoadBalancing12.2(1)Automatic Server FailureDetectionIOS SLB automatically detects each failed The following sections provideTCP connection attempt to a real server,information about this feature:and increments a failure counter for that Automatic Server Failureserver. If a server’s failure counter exceedsDetectiona configurable failure threshold, the serveris considered out of service and is removed How to Disable AutomaticServer Failure Detectionfrom the list of active real servers.12.2(14)ZA4Automatic Server FailureDetection: DisablingAutomatic Server FailureDetectionIOS SLB automatically detects each failed The following sections provideTCP connection attempt to a real server,information about this feature:and increments a failure counter for that Automatic Server Failureserver. If a server’s failure counter exceedsDetectiona configurable failure threshold, the serveris considered out of service and is removed How to Disable AutomaticServer Failure Detectionfrom the list of active real servers.Cisco IOS Server Load Balancing Configuration Guide1-3
Chapter 1Cisco IOS SLB Features RoadmapX M L C o n v e r s i o n D r a f t - 0 3 / 0 7 / 2 0 11Table 1-1Feature Information for IOS SLB (continued)ReleasesFeature NameFeature Description12.2(1)Automatic UnfailWhen a real server fails and is removedThe following section providesfrom the list of active servers, it is assigned information about this feature:no new connections for a length of time Automatic Unfailspecified by a configurable retry timer.After that timer expires, the server is againeligible for new virtual server connectionsand IOS SLB sends the server the nextqualifying connection. If the connection issuccessful, the failed server is placed backon the list of active real servers. If theconnection is unsuccessful, the serverremains out of service and the retry timer isreset. The unsuccessful connection musthave experienced at least one retry,otherwise the next qualifying connectionwould also be sent to that failed server.12.2(1)Avoiding Attacks on ServerFarms and Firewall FarmsA highly secure site can take certain stepsto protect its server farms and firewallfarms from attacks.The following section providesinformation about this feature:A backup server farm is a server farm thatcan be used when none of the real serversdefined in a primary server farm isavailable to accept new connections.The following sections provideinformation about this feature:12.2(14)SBackup Server FarmsWhere Documented Avoiding Attacks onServer Farms and FirewallFarms Backup Server Farms How to Configure aVirtual Server12.2(1)Bind ID SupportThe bind ID allows one physical server to The following sections providebe bound to multiple virtual servers andinformation about this feature:report a different weight for each one. Bind ID SupportThus, the single real server is representedas multiple instances of itself, each having DFP for Cisco IOS SLBa different bind ID. Dynamic Feedback How to Configure a ServerProtocol (DFP) uses the bind ID to identifyFarm and a Real Serverfor which instance of the real server a givenweight is specified. The bind ID is neededonly if you are using DFP.12.2(1)Client-Assigned LoadBalancingClient-assigned load balancing allows you The following section providesto limit access to a virtual server byinformation about this feature:specifying the list of client IP subnets that Client-Assigned Loadare permitted to use that virtual server.BalancingWith this feature, you can assign a set ofclient IP subnets (such as internal subnets)connecting to a virtual IP address to oneserver farm or firewall farm, and assignanother set of clients (such as externalclients) to a different server farm orfirewall farm.Cisco IOS Server Load Balancing Configuration Guide1-4
Chapter 1Cisco IOS SLB Features RoadmapX M L C o n v e r s i o n D r a f t - 0 3 / 0 7 / 2 0 11Table 1-1Feature Information for IOS SLB (continued)ReleasesFeature NameFeature DescriptionWhere Documented12.2(33)SRCConnection Rate LimitingIOS SLB enables you to specify themaximum connection rate allowed for areal server in a server farm.The following sections provideinformation about this feature: Connection Rate Limiting How to Configure a ServerFarm and a Real Server12.2(1)Content Flow MonitorSupportIOS SLB supports the Cisco Content Flow The following section providesMonitor (CFM), a web-based statusinformation about this feature:monitoring application within the Content Flow MonitorCiscoWorks2000 product family. You canSupportuse CFM to manage Cisco serverload-balancing devices. CFM runs onWindows NT and Solaris workstations, andis accessed using a web browser.12.2(1)Delayed Removal of TCPConnection ContextBecause of IP packet ordering anomalies, The following sections provideIOS SLB might “see” the end of a TCPinformation about this feature:connection (a finish [FIN] or reset [RST]) Delayed Removal of TCPfollowed by other packets for theConnection Contextconnection. This problem usually occurswhen there are multiple paths that the TCP How to Configure a ServerFarm and a Real Serverconnection packets can follow. To correctlyredirect the packets that arrive after theconnection has ended, IOS SLB retains theTCP connection information, or context,for a specified length of time. The length oftime the context is retained after theconnection has ended is controlled by aconfigurable delay timer.12.2(1)DFP SupportIOS SLB supports the Dynamic FeedbackProtocol (DFP).The following sections provideinformation about this feature: DFP for Cisco IOS SLB How to Configure DFP Examples: How toConfigure IOS SLB withGPRS Load Balancing Example: How toConfigure IOS SLB withKAL-AP AgentCisco IOS Server Load Balancing Configuration Guide1-5
Chapter 1Cisco IOS SLB Features RoadmapX M L C o n v e r s i o n D r a f t - 0 3 / 0 7 / 2 0 11Table 1-1Feature Information for IOS SLB (continued)ReleasesFeature NameFeature Description12.2(14)SDFP Agent SubsystemSupportIOS SLB supports the DFP AgentThe following sections provideSubsystem feature, also called global load information about this feature:balancing, which enables client subsystems Dynamic Feedbackother than IOS SLB to act as DFP agents.Protocol (DFP) AgentWith the DFP Agent Subsystem, you canSubsystem Supportuse multiple DFP agents from different How to Configure DFPclient subsystems at the same time.12.2(17d)SXD12.2(14)ZA5DFP and the Home AgentDirector Example: How toConfigure IOS SLB withGPRS Load BalancingWithout GTP Cause CodeInspection Example: How toConfigure IOS SLB withGPRS Load Balancing andNAT Example: How toConfigure IOS SLB withKAL-AP AgentFor the Home Agent Director, you canThe following sections providedefine IOS SLB as a DFP manager andinformation about this feature:define a DFP agent on each home agent in DFP for Cisco IOS SLBthe server farm, and the DFP agent canreport the weights of the home agents. The DFP and the Home AgentDirectorDFP agents calculate the weight of eachhome agent based on CPU use, processor Home Agent Directormemory, and the maximum number of How to Configure DFPbindings that can be activated for eachhome agent. Home Agent DirectorConfiguration Task ListExchange Director Features IOS SLB supports the Exchange Directorfor the mobile Service ExchangeFramework (mSEF) for Cisco 7600 seriesrouters.Cisco IOS Server Load Balancing Configuration Guide1-6Where Documented Examples: How toConfigure IOS SLB withGPRS Load Balancing Example: How toConfigure IOS SLB withHome Agent Director Example: How toConfigure IOS SLB withKAL-AP AgentThe following section providesinformation about this feature: Exchange DirectorFeatures
Chapter 1Cisco IOS SLB Features RoadmapX M L C o n v e r s i o n D r a f t - 0 3 / 0 7 / 2 0 11Table 1-1Feature Information for IOS SLB (continued)ReleasesFeature NameFeature Description12.2(1)Firewall Load BalancingAs its name implies, firewall loadThe following sections providebalancing enables IOS SLB to balanceinformation about this feature:flows to firewalls. Firewall load balancing Firewall Load Balancinguses a load-balancing device on each side How to Configure Firewallof a group of firewalls (called a firewallLoad Balancingfarm) to ensure that the traffic for each flowtravels to the same firewall, ensuring that Examples: How tothe security policy is not compromised.Configure IOS SLB withFirewall Load Balancing12.2(14)SFirewall Load Balancing:Multiple Firewall FarmSupportYou can configure more than one firewallfarm in each load-balancing device.12.2(33)SREFirewall Load Balancing:Performance ImprovementsWhere DocumentedIOS SLB firewall load balancing enablesyou to avoid certain conditions that canresult in high CPU usage.The following sections provideinformation about this feature: Multiple Firewall FarmSupport How to Configure FirewallLoad Balancing Example: How toConfigure IOS SLB withMultiple Firewall FarmsThe following sections provideinformation about this feature: How to Configure FirewallLoad Balancing How to ConfigureProtocol-Level Purging ofMLS entries How to ConfigureConnection Purge RequestBehavior How to Configure StickyConnection Purge RequestBehaviorThe following commands arenew for this feature:purge connection, purgestickyThe following command wasmodified by this feature:access (firewall farm)Cisco IOS Server Load Balancing Configuration Guide1-7
Chapter 1Cisco IOS SLB Features RoadmapX M L C o n v e r s i o n D r a f t - 0 3 / 0 7 / 2 0 11Table 1-1Feature Information for IOS SLB (continued)ReleasesFeature NameFeature DescriptionWhere Documented12.2(14)ZA5Flow PersistenceFlow persistence provides intelligent return The following section providesrouting of load-balanced IP flows to theinformation about this feature:appropriate node, without the need for Flow Persistencecoordinated hash mechanisms on bothsides of the load-balanced data path, andwithout using Network AddressTranslation (NAT) or proxies to changeclient or server IP addresses.15.0(1)SGPRS Load Balancing:IPv6 support enables IOS SLB to manage The following sections provideDual-Stack Support for GTP IPv6 addresses for GTP load balancing, for information about this feature:Load Balancingall versions of GTP (v0, v1, v2). Dual-Stack Support forGTP Load Balancing GPRS Load BalancingConfiguration Task List Example: How toConfigure IOS SLB withDual-Stack Addresses forGTP Load BalancingThe following command isnew for this feature:show ip slb wildcardThe following commands weremodified by this feature:client (virtual server), real(server farm), serverfarm,show ip slb reals, show ip slbserverfarms, show ip slbsessions, show ip slb sticky,show ip slb vservers, show ipslb wildcard.12.2(17d)SXB1GPRS Load Balancing:This feature enables a GGSN to notifyThe following sections provideGGSN-IOS SLB Messaging IOS SLB when certain conditions occur.information about this feature:The notifications enable IOS SLB to make GGSN-IOS SLBintelligent decisions, which in turnMessagingimproves GPRS load balancing and failure GGSN-IOS SLBdetection.Messaging Task ListCisco IOS Server Load Balancing Configuration Guide1-8
Chapter 1Cisco IOS SLB Features RoadmapX M L C o n v e r s i o n D r a f t - 0 3 / 0 7 / 2 0 11Table 1-1Feature Information for IOS SLB (continued)ReleasesFeature NameFeature DescriptionWhere Documented12.2(14)ZA2GPRS Load Balancing:GPRS load balancing with GTP cause code The following sections provideinformation about this feature:GTP Cause Code Inspection inspection enabled allows IOS SLB
XML Conversion Draft - 03/07/2011 iii Cisco IOS Server Load Balancing Configuration Guide OL-24559-01 CONTENTS CHAPTER 1 Cisco IOS SLB Features Roadmap 1-1 CHAPTER 2 Information About Cisco IOS SLB 2-1 Overview 2-1 Benefits of IOS SLB 2-3 Cisco IOS SLB Features 2-4 Routing Features 2-4 Algorithms for Server Load Balancing 2-5 Bind ID Support 2-6
Cisco IOS Server Load Balancing Command Reference . Cisco IOS Server Load Balancing Command Reference. Examples. string. clearipslbconnections[firewallfarmfirewall-farm serverfarmserver-farm vservervirtual-server] Command Default. SLB. command. .
C O N T E N T S Information About Cisco IOS SLB 1 Overview 1 Benefits of IOS SLB 3 Cisco IOS SLB Features 3 Routing Features 4 Algorithms for Server Load Balancing 4 Weighted Round Robin Algorithm 4 Weighted Least Connections Algorithm 5 Route Map Algorithm 5 Bind ID Support 6 Client-Assigned Load Balancing 6 Connection Rate Limiting 6 Content Flow Monitor Support 6 Delayed Removal of TCP .
C O N T E N T S Information About Cisco IOS SLB 1 Overview 1 Benefits of IOS SLB 3 Cisco IOS SLB Features 3 Routing Features 4 Algorithms for Server Load Balancing 4 Weighted Round Robin Algorithm 4 Weighted Least Connections Algorithm 5 Route Map Algorithm 5 Bind ID Support 6 Client-Assigned Load Balancing 6 Connection Rate Limiting 6 Content Flow Monitor Support 6 Delayed Removal of TCP .
8. Load Balancing Lync Note: It's highly recommended that you have a working Lync environment first before implementing the load balancer. Load Balancing Methods Supported Microsoft Lync supports two types of load balancing solutions: Domain Name System (DNS) load balancing and Hardware Load Balancing (HLB). DNS Load Balancing
Oct 27, 2014 · Cisco ISR 4400 Series Cisco ISR 4300 Series Cisco ISR 4431 Cisco ISR 4321 Cisco ISR 4451 Cisco ISR 4331 Cisco ISR 4351 Table 1 Cisco IOS XE 3S–to–Cisco IOS Release Number Mapping Cisco IOS XE 3S Release Cisco IOS Release 3.14 15.5(1)S 3.13S 15.4(3)S 3
Router Software Origin Validation (RPKI RTR & BGP Modifications) available in Cisco IOS and IOS-XR Cisco IOS code available in IOS XE-3.5.0/15.1(3)S Cisco IOS platforms targeted ASR1K, 7600, ME3600/ ME3800, ASR 903 Cisco IOS-XR available in the XR-4.2.1 Cisco IOS-X
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Health in Care Homes Version 2 March 2020 . page 1 The framework for Enhanced Health in Care Homes 2020/21 - Version 2 Publishing approval number: 001681 Version number: 2 First published: 31 March 2020 Prepared by: Community Services and Ageing Well Team This information can be made available in alternative formats, such as easy read or large print, and may be available in alternative .
