Getting Started with Citrix ADC
Deploy a Citrix ADC VPX instance
Install a Citrix ADC VPX instance on Microsoft Hyper-V servers
Install a Citrix ADC VPX instance on Linux-KVM platform
Prerequisites for Installing Citrix ADC VPX Virtual Appliances on Linux-KVM Platform
Provisioning the Citrix ADC Virtual Appliance by using OpenStack
Provisioning the Citrix ADC Virtual Appliance by using the Virtual Machine Manager
Configuring Citrix ADC Virtual Appliances to Use SR-IOV Network Interface
Configuring Citrix ADC Virtual Appliances to use PCI Passthrough Network Interface
Provisioning the Citrix ADC Virtual Appliance by using the virsh Program
Provisioning the Citrix ADC Virtual Appliance with SR-IOV, on OpenStack
Configuring a Citrix ADC VPX Instance on KVM to Use OVS DPDK-Based Host Interfaces
Deploy a Citrix ADC VPX instance on AWS
Deploy a Citrix ADC VPX instance on Microsoft Azure
Network architecture for Citrix ADC VPX instances on Microsoft Azure
配置multiple IP addresses for a Citrix ADC VPX standalone instance
配置a high-availability setup with multiple IP addresses and NICs
配置a high-availability setup with multiple IP addresses and NICs by using PowerShell commands
配置HA-INC nodes by using the Citrix high availability template with Azure ILB
Solutions for Telecom Service Providers
Load Balance Control-Plane Traffic that is based on Diameter, SIP, and SMPP Protocols
Provide Subscriber Load Distribution Using GSLB Across Core-Networks of a Telecom Service Provider
Authentication, authorization, and auditing application traffic
Configuring authentication, authorization, and auditing policies
Configuring Authentication, authorization, and auditing with commonly used protocols
Use an on-premises Citrix Gateway as the identity provider for Citrix Cloud
Troubleshoot authentication issues in Citrix ADC and Citrix Gateway with aaad.debug module
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AppExpert Applications and Templates
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Persistence and persistent connections
Advanced load balancing settings
Gradually stepping up the load on a new service with virtual server–level slow start
Retrieve location details from user IP address using geolocation database
Use source IP address of the client when connecting to the server
Use client source IP address for backend communication in a v4-v6 load balancing configuration
Set a limit on number of requests per connection to the server
配置automatic state transition based on percentage health of bound services
Use case 2: Configure rule based persistence based on a name-value pair in a TCP byte stream
Use case 3: Configure load balancing in direct server return mode
Use case 6: Configure load balancing in DSR mode for IPv6 networks by using the TOS field
Use case 7: Configure load balancing in DSR mode by using IP Over IP
Use case 10: Load balancing of intrusion detection system servers
Use case 11: Isolating network traffic using listen policies
Use case 12: Configure Citrix Virtual Desktops for load balancing
Use case 13: Configure Citrix Virtual Apps for load balancing
Use case 14: ShareFile wizard for load balancing Citrix ShareFile
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Configuring a CloudBridge Connector Tunnel between two Datacenters
Configuring CloudBridge Connector between Datacenter and AWS Cloud
Configuring a CloudBridge Connector Tunnel Between a Datacenter and Azure Cloud
Configuring CloudBridge Connector Tunnel between Datacenter and SoftLayer Enterprise Cloud
Configuring a CloudBridge Connector Tunnel Between a Citrix ADC Appliance and Cisco IOS Device
CloudBridge Connector Tunnel Diagnostics and Troubleshooting
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Least bandwidth method
A load balancing virtual server configured to use the least bandwidth method selects the service that is currently serving the least amount of traffic, measured in megabits per second (Mbps). The following example shows how the virtual server selects a service for load balancing by using the least bandwidth method.
Consider three services, Service-HTTP-1, Service-HTTP-2, and Service-HTTP-3.
- Service-HTTP-1 has 3 Mbps bandwidth.
- Service-HTTP-2 has 5 Mbps bandwidth.
- Service-HTTP-3 has 2 Mbps bandwidth.
的following diagram illustrates how the virtual server uses the least bandwidth method to forward requests to the three services.
Figure 1. How the Least Bandwidth Load Balancing Method Works
的virtual server selects the service by using the bandwidth value (N), which is the sum of the number of bytes transmitted and received over the previous 14 seconds. If each request requires 1 Mbps bandwidth, the Citrix ADC appliance delivers requests as follows:
- Service-HTTP-3 receives the first request, because this service has the lowest N value.
- Since Service-HTTP-1 and Service-HTTP-3 now have same N value, the virtual server switches to the round robin method for these servers, alternating between them. Service-HTTP-1 receives the second request, Service-HTTP-3 receives the third request, Service-HTTP-1 receives the fourth request, Service-HTTP-3 receives the fifth request, and Service-HTTP-1 receives the sixth request.
- Since Service-HTTP-1, Service-HTTP-2, and Service-HTTP-3 now all have same N value, the virtual server includes Service-HTTP-2 in the round robin list. Therefore, Service-HTTP-2 receives the seventh request, Service-HTTP-3 receives the eighth request, and so on.
的following table summarizes how N is calculated.
Request Received | Service Selected | Current N Value | Remarks |
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Request-1 | Service-HTTP-3; (N = 2) | N = 3 | Service-HTTP-3 has the lowest N value. |
Request-2 | Service-HTTP-1; (N = 3) | N = 4 | Service-HTTP-1 and Service-HTTP-3 have the same N values. |
Request-3 | Service-HTTP-3;(N = 3) | N = 4 | Service-HTTP-1 and Service-HTTP-3 have the same N values. |
Request-4 | Service-HTTP-1; (N = 4) | N = 5 | - |
Request-5 | Service-HTTP-3; (N = 4) | N = 5 | - |
Request-6 | Service-HTTP-1; (N = 5) | N = 6 | Service-HTTP-1, Service-HTTP-2, and Service-HTTP-3 have the same N values. |
Request-7 | Service-HTTP-2; (N = 5) | N = 6 | Service-HTTP-1, Service-HTTP-2, and Service-HTTP-3 have the same N values. |
Request-8 | Service-HTTP-3; (N = 5) | N = 6 | - |
Note: If you enable the RTSP NAT option on the virtual server, the Citrix ADC appliance uses the number of data and control bytes exchanged to determine the bandwidth usage for RTSP services. For more information about RTSP NAT option, seeManaging RTSP Connections.
的Citrix ADC appliance also performs load balancing by using the bandwidth and weights if different weights are assigned to the services. It selects a service by using the value (Nw) in the following expression:
Nw = (N) * (10000 / weight)
As in the preceding example, suppose Service-HTTP-1 is assigned a weight of 2, Service-HTTP-2 is assigned a weight of 3, and Service-HTTP-3 is assigned a weight of 4. The Citrix ADC appliance delivers requests as follows:
- Service-HTTP-3 receives the first second, third, fourth, and fifth requests, because this service has the lowest Nw value.
- Service-HTTP-1 receives the sixth request, because this service has the lowest Nw value.
- Service-HTTP-3 receives the seventh request, because this service has the lowest Nw value.
- Service-HTTP-2 receives the eighth request, because this service has the lowest Nw value.
的following table summarizes how Nw is calculated.
Request Received | Service Selected | Current Nw Value (Number of Active Transactions) * (10000 / Weight) | Remarks |
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Request-1 | Service-HTTP-3; (Nw = 5000) | Nw = 5000 | Service-HTTP-3 has the lowest Nw value. |
Request-2 | Service-HTTP-3; (Nw = 5000) | Nw = 7500 | - |
Request-3 | Service-HTTP-3; (Nw = 7500) | Nw = 10000 | - |
Request-4 | Service-HTTP-3; (Nw = 10000) | Nw = 12500 | - |
Request-5 | Service-HTTP-3; (Nw = 12500) | Nw = 15000 | - |
Request-6 | Service-HTTP-1; (Nw = 15000) | Nw = 20000 | Service-HTTP-1 and Service-HTTP-3 have the same Nw value. |
Request-7 | Service-HTTP-3; (Nw = 15000) | Nw = 17500 | Service-HTTP-1 and Service-HTTP-3 have the same Nw value. |
Request-8 | Service-HTTP-2; (Nw = 16666.67) | Nw = 20000 | Service-HTTP-2 has the lowest Nw value. |
的following diagram illustrates how the virtual server uses the least bandwidth method when weights are assigned to the services.
Figure 2. How the Least Bandwidth Load Balancing Method Works When Weights Are Assigned
To configure the least bandwidth method, seeConfiguring a Load Balancing Method that Does Not Include a Policy.
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