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Manual Chapter: Configuration Guide for BIG-IP® version 9.2.2 Global Traffic Management: Working with Listeners - 5
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5

Defining the Physical Network


Introducing physical network components

The components that make up the Global Traffic Manager fall into two categories: logical components and physical components. Logical components are abstractions of network resources, such as a virtual server. Physical components, on the other hand, have a direct correlation with one or more physical entities on the network. This chapter deals with the physical components of the Global Traffic Manager. For information on the logical components of the Global Traffic Manager, see Chapter 6, Defining the Logical Network .

Through the Global Traffic Manager, you define several primary types of physical network components:

  • Data centers
  • Servers
  • Virtual servers
  • Links

A data center defines the group of Global Traffic Managers, Local Traffic Managers, and host systems that reside in a single physical location. Within the Global Traffic Manager, a data center contains at least one server and one link. Every resource, whether physical or logical, is associated in some way with a data center.

A server defines a specific system on the network. A system can be a single Global Traffic Manager, Local Traffic Manager, or host system. Within the Global Traffic Manager, a server, with the exception of Global Traffic Managers and Link Controllers, must also contain at least one virtual server.

A virtual server, in the context of the Global Traffic Manager, is a combination of IP address and port number that points to a specific resource on the network.

A link defines a physical connection to the Internet. Links are associated with one or more routers on the network. The Global Traffic Manager tracks the performance of links, which in turn can dictate the overall availability of a given pool, data center, wide IP, or distributed application.

This chapter describes how to define the physical components that make up your network, including setting up data centers, servers, and links.

Managing data centers

A data center defines the group of Global Traffic Managers, Local Traffic Managers, host systems, and links that share the same subnet on the network. The Global Traffic Manager consolidates the paths and metrics data collected from both servers, virtual servers, and links into the data center, and uses that consolidated data when conducting load balancing operations. Any server or link that you add to the Global Traffic Manager configuration must belong to one and only one data center, and you must configure at least one data center before you can add servers to the Global Traffic Manager configuration.

Common tasks you perform while working with data centers include:

  • Configuring data centers
  • Modifying data centers
  • Deleting data centers
  • Enabling and deleting data centers

Configuring data centers

A data center defines the group of Global Traffic Managers, Local Traffic Managers, host systems, and links that share the same subnet on the network. Depending on your router configuration, the following data center configurations are available:

  • A single data center encompasses a single physical location
  • A single data center encompasses multiple physical locations
  • A single physical location includes multiple data centers

For example, the fictional company SiteRequest has a network operation center in New York, which contains two subnets: 192.168.11.0/24 and 192.168.22.0/24. Because there are two subnets, the IT team needs to create two data centers: New York 1 and New York 2, within the Global Traffic Manager. On the opposite side of the country, SiteRequest has three operational centers, but they all share the same subnet of 192.168.33.0/24. To reflect this in the Global Traffic Manager, the IT team needs to create a single data center: West Coast.

Within the Global Traffic Manager, you define a data center by the following characteristics:

  • Name. The descriptive name of the data center, such as New York 1 or West Coast.
  • Physical location. A description of the geographical area in which the data center resides, such as New York City - Building A.
  • Contact. The name of a individual responsible for managing the network at the data center.
  • State. The state of the data center. Available options are Enabled or Disabled.

To configure a data center

  1. On the Main tab of the navigation pane, expand Global Traffic and click Data Centers.
    The main screen for data centers opens.
  2. Click the Create button.
    The New Data Center screen opens.
  3. Add the new data center settings.
    For additional assistance with these settings, please see the online help.
  4. Click the Finished button.

Repeat this process for each data center in your network.

Modifying data centers

After you create a data center, you can access its settings, changing them as needed.

To modify a data center

  1. On the Main tab of the navigation pane, expand Global Traffic and click Data Centers.
    The main screen for data centers opens.
  2. Click the name of the data center that you want to modify.
    The properties screen for that data center appears.
  3. Modify the settings for the data center.
    For additional assistance with these settings, please see the online help.
  4. Click the Update button to save your changes.

Deleting data centers

In the event that a data center is no longer needed within the Global Traffic Manager, you can delete it from the system.

To delete a data center

  1. On the Main tab of the navigation pane, expand Global Traffic and click Data Centers.
    The main screen for data centers opens.
  2. Check the Select check box that corresponds to the data center that you want to delete.
  3. Click the Delete button.
    A confirmation screen opens.
  4. Click the Delete button to delete the data center.

Enabling and disabling data centers

When you create a data center, you determine whether you want the data center enabled or not. Resources associated with a data center are available only if the following criteria are met:

  • The data center is enabled.
  • The data center is available, based on the metrics collected by the Global Traffic Manager.

You can enable or disable a data center manually, allowing you to remove a data center temporarily from the Global Traffic Manager's load balancing operations; for example, during a maintenance period. When the maintenance period has ended, you can enable the data center, allowing the Global Traffic Manager to consider the resources of that data center when load balancing connection requests.

To enable a data center

  1. On the Main tab of the navigation pane, expand Global Traffic and click Data Centers.
    The main screen for data centers opens.
  2. Check the Select check box that corresponds to the data center that you want to enable.
  3. Click the Enable button to enable the data center.
    Note that the icon representing the availability of the data center changes to a blue square to reflect its current level of availability.

To disable a data center

  1. On the Main tab of the navigation pane, expand Global Traffic and click Data Centers.
    The main screen for data centers opens.
  2. Check the Select check box that corresponds to the data center that you want to disable.
  3. Click the Disable button to disable the data center.
    Note that the icon representing the availability of the data center changes to a black square, indicating that it is disabled.

Managing servers

A server defines a specific system on the network. In the Global Traffic Manager, servers are not only physical entities that you can change and modify as needed; they also house the virtual servers that are the ultimate destinations of name resolution requests. In essence, servers are the core of the physical components that you manage with the Global Traffic Manager.

The Global Traffic Manager supports three types of servers:

  • BIG-IP systems
    A BIG-IP system can be a Global Traffic Manager (including the current Global Traffic Manager), a Local Traffic Manager, or a Link Controller.
  • Third-party load balancing systems
    A third-party load balancing system is any system, other than a BIG-IP system, that supports and manages virtual servers on the network. See Defining load balancing servers for information on how to define these servers and a list of supported load balancing servers.
  • Third-party host servers
    A third-party host system is any server resource on the network that does not support virtual servers. See Defining host servers for information on how to define these servers and a list of supported host servers.

At a minimum, you must set up the following servers on your Global Traffic Manager:

  • Your current Global Traffic Manager
  • A managed server (either a load balancing server or a host)

This section describes how to set up each server type in your network. The setup procedures here assume that the servers are up and running in the network, and that they already have virtual servers defined (if the server manages virtual servers).

Defining BIG-IP systems

A BIG-IP system is defined as any Global Traffic Manager, a Local Traffic Manager, or a Link Controller. Defining a BIG-IP system includes defining the Global Traffic Manager that you are currently configuring. This ensures that the Global Traffic Manager communicates correctly with the rest of the network and can be synchronized with other Global Traffic Managers on the network.

Defining the current Global Traffic Manager

One type of server that you must define for your physical network is the Global Traffic Manager itself. This process includes defining two types of Global Traffic Managers. The first is the current Global Traffic Manager, which is the Global Traffic Manager that you are currently configuring. The second type of Global Traffic Managers is subsequent Global Traffic Managers, which include backup systems on the current network segment, or systems that reside at another data center. The information you provide on these systems allows the agents and other utilities, such as the big3d agent, to gather and analyze path and metrics information on network traffic. In addition, adding Global Traffic Managers as part of defining the physical network is necessary when you want to synchronize the settings across multiple systems.

Important

If you have multiple Global Traffic Managers on your network, we recommend that you define the current Global Traffic Manager first, followed by any additional systems.

To define the current Global Traffic Manager

  1. On the Main tab of the navigation pane, expand Global Traffic and click Servers.
    The main screen for servers opens.
  2. Click the Create button.
    The New Server screen opens.
  3. In the Name box, type a name that identifies the Global Traffic Manager.
  4. From the Product list, select the appropriate server product.
    Global Traffic Managers, Local Traffic Managers, and Link Controllers all fall under the BIG-IP product family. Any time you add one of these systems as a server, you can select one of two server products from the Product list:
    • If the system is a primary system, select BIG-IP System (Single).
    • If the system is a backup system, select BIG-IP System (Redundant).
  5. For Address List, add the IP address of the server.
    To add the IP address, type the address in the Address box, and then click Add. You can add more than one address to any given server, depending on how that server interacts with the rest of your network. For example, if the current Global Traffic Manager is part of a redundant system, you would add the IP addresses of the primary and backup systems.
  6. From the Data Center list, select a data center to which the Global Traffic Manager belongs.
    A server must belong to a data center. See Managing data centers for additional information.
  7. Configure the remaining server settings.
    For additional assistance on these settings, see the online help.
  8. Click the Create button to create the new server.

Defining Local Traffic Managers

Local Traffic Managers are load balancing servers that manages virtual servers on the network. There are two standard configurations for a Local Traffic Manager:

  • A stand-alone system on the network
  • A component module residing on the same hardware as the Global Traffic Manager

Regardless of whether the Local Traffic Manager shares the same hardware as the Global Traffic Manager, you should ensure that you have the following information available before you define the system:

  • The self IP addresses and translations of the Local Traffic Manager's interfaces
  • The IP address and service name or port number of each virtual server managed by the Local Traffic Manager, only if you do not want to use auto-configuration to discover the Local Traffic Manager's virtual servers
Important

If your installation of the Global Traffic Manager resides on the same system as a Local Traffic Manager, you define only one BIG-IP server. This server entry represents both the Global Traffic Manager and Local Traffic Manager modules.

To define a Local Traffic Manager

  1. On the Main tab of the navigation pane, expand Global Traffic and click Servers.
    The main screen for servers opens.
  2. Click the Create button.
    The New Server screen opens.
  3. In the Name box, type a name that identifies the Local Traffic Manager.
  4. From the Product list, select the appropriate server product.
    Global Traffic Managers, Local Traffic Managers, and Link Controllers all fall under the BIG-IP product family. Any time you add one of these systems as a server, you can select one of two server products from the Product list:
    • If the system is a primary system, select BIG-IP System (Single).
    • If the system is a backup system, select BIG-IP System (Redundant).
  5. For Address List, add the IP address of the server.
    To add the IP address, type the address in the Address box, and then click Add. You can add more than one address to any given server, depending on how that server interacts with the rest of your network. For example, if the current Global Traffic Manager is part of a redundant pair, you would add the IP addresses of the primary and backup systems.
  6. From the Data Center list, select a data center to which the Local Traffic Manager belongs.
    A server must belong to a data center. See Managing data centers for additional information.
  7. Configure the remaining server settings, including the virtual servers managed by the Local Traffic Manager.
    For additional assistance on these settings, see the online help.
  8. Click the Create button to create the new server.

Defining Link Controllers

The Link Controller is also part of the BIG-IP product family. Link Controllers are systems that monitor the performance and availability of wide-area connections.

To define a Link Controller

  1. On the Main tab of the navigation pane, expand Global Traffic and click Servers.
    The main screen for servers opens.
  2. Click the Create button.
    The New Server screen opens.
  3. In the Name box, type a name that identifies the Link Controller.
  4. From the Product list, select BIG-IP System (Single).
    Global Traffic Managers, Local Traffic Managers, and Link Controllers all fall under the BIG-IP product family. Any time you add one of these systems as a server:
    • If the system is a primary system, select BIG-IP System (Single).
    • If the system is a backup system, select BIG-IP System (Redundant).
  5. For Address List, add the IP address of the server.
    To add the IP address, type the address in the Address box, and then click Add. You can add more than one address to any given server, depending on how that server interacts with the rest of your network.
  6. From the Data Center list, select a data center to which the Link Controller belongs.
    A server must belong to a data center. Please see Managing data centers for additional information.
  7. Configure the remaining server settings.
    For additional assistance on these settings, please see the online help.
  8. Click the Create button to create the new server.

Defining load balancing servers

In addition to BIG-IP systems, the Global Traffic Manager can interact with other load-balancing servers to determine availability and performance metrics for load balancing connection requests.

The Global Traffic Manager supports these load balancing servers:

  • Alteon Ace Director
  • Cisco CSS
  • Cisco LocalDirector v2
  • Cisco LoadDirector v3
  • Cisco SLB
  • Extreme
  • Foundry ServerIron
  • Radware WSD
Note

If your network uses a load balancing server not found on this list, you can use the Generic Load Balancer option. See Using the generic load balancer option .

Adding load balancing servers

You can add as many third-party load balancing servers as you need into your configuration of the Global Traffic Manager.

To add a load balancing server

  1. On the Main tab of the navigation pane, expand Global Traffic and click Servers.
    The main screen for servers opens.
  2. Click the Create button.
    The New Server screen opens.
  3. In the Name box, type a name that identifies the server.
  4. From the Product list, select the appropriate load balancing server.
    If your network uses a load balancing server not found on this list, you can use the Generic Load Balancer option. See Using the generic load balancer option .
  5. For Address List, add the IP address of the server.
    To add the IP address, type the address in the Address box, and then click Add. You can add more than one address to any given server, depending on how that server interacts with the rest of your network.
  6. From the Data Center list, select a data center to which the server belongs.
    A server must belong to a data center. See Managing data centers for additional information.
  7. Configure the remaining server settings.
    For additional assistance on these settings, see the online help.
  8. Click the Create button to create the new server.

Using the generic load balancer option

In the event that your network uses a load balancing server that is not explicitly supported by the Global Traffic Manager, you can add it through the use of the generic load balancer option.

To define a generic load balancing server

  1. On the Main tab of the navigation pane, expand Global Traffic and click Servers.
    The main screen for servers opens.
  2. Click the Create button.
    The New Server screen opens.
  3. In the Name box, type a name that identifies the server.
  4. From the Product list, select Generic Load Balancer.
  5. For Address List, add the IP address of the server.
    To add the IP address, type the address in the Address box, and then click Add. You can add more than one address to any given server, depending on how that server interacts with the rest of your network.
  6. From the Data Center list, select a data center to which the server belongs.
    A server must belong to a data center. Please see Managing data centers for additional information.
  7. Configure the remaining server settings.
    For additional assistance on these settings, please see the online help.
  8. Click the Create button to create the new server.

Defining host servers

Another server type that you might include as part of your network is a host. A host is an individual network resource, such as web page or a database, that is not a part of the BIG-IP product family and does not provide load balancing capabilities for the resources is supports.

The following is a list of host servers that the Global Traffic Manager supports:

  • CacheFlow
  • NetApp
  • Sun Solaris
  • Windows 2000 Server
  • Windows NT 4.0
Note

If your network uses a host server not found on this list, you can use the Generic Load Balancer option. See Using the generic host server option .

To define a host server

  1. On the Main tab of the navigation pane, expand Global Traffic and click Servers.
    The main screen for servers opens.
  2. Click the Create button.
    The New Server screen opens.
  3. In the Name box, type a name that identifies the server.
  4. From the Product list, select the appropriate host server.
    If your network uses a server not found on this list, you can use the generic host server option. See Using the generic host server option .
  5. For Address List, add the IP address of the server.
    To add the IP address, type the address in the Address box, and then click Add. You can add more than one address to any given server, depending on how that server interacts with the rest of your network.
  6. From the Data Center list, select a data center to which the server belongs.
    A server must belong to a data center. See Managing data centers for additional information.
  7. Configure the remaining server settings.
    For additional assistance on these settings, See the online help.
  8. Click the Create button to create the new server.

Using the generic host server option

In the event that your network uses a host server that is not explicitly supported by the Global Traffic Manager, you can add it through the use of the generic host server option.

To define a generic host server

  1. On the Main tab of the navigation pane, expand Global Traffic and click Servers.
    The main screen for servers opens.
  2. Click the Create button.
    The New Server screen opens.
  3. In the Name box, type a name that identifies the server.
  4. From the Product list, select Generic Host.
  5. For Address List, add the IP address of the server.
    To add the IP address, type the address in the Address box, and then click Add. You can add more than one address to any given server, depending on how that server interacts with the rest of your network.
  6. From the Data Center list, select a data center to which the server belongs.
    A server must belong to a data center. see Managing data centers for additional information.
  7. Configure the remaining server settings.
    For additional assistance on these settings, see the online help.
  8. Click the Create button to create the new server.

Assigning monitors to servers

Each server that you add to the Global Traffic Manager, whether it is a BIG-IP system, a third-party load balancing server, or a host server, has a variety of monitors available. You can assign these monitors to track specific data, and use that data to determine load balancing or other actions. Detailed information about monitors is available in Chapter 10, Configuring Monitors .

To add monitors to a server

  1. On the Main tab of the navigation pane, expand Global Traffic and click Servers.
    The main screen for servers opens.
  2. Click the name of the server to which you want to add monitors.
    The properties screen for that server opens.
  3. From the Configuration list, select Advanced.
    This displays additional fields, and allows you to modify additional default settings.
  4. For Health Monitors, use the Move buttons provided to move monitors from the Available list to the Selected list.
    Monitors in the Selected list are active for the server.
  5. Click the Update button to save your changes.

Setting limit thresholds

When you set limit thresholds for availability, the Global Traffic Manager can detect when a managed server is low on system resources, and can redirect the traffic to another server. Setting limits can help eliminate any negative impact on a server's performance of service tasks that may be time critical, require high bandwidth, or put high demand on system resources. The system resources vary depending on the monitors you have assigned to the server.

You can set limits thresholds for the following elements:

  • Servers
  • Pools
  • Pool members
  • Virtual servers

Setting limit thresholds for servers

The available thresholds for which you can set limits for servers depends on whether the server is part of the BIG-IP product family, such as a Local Traffic Manager, or another server type. If the server is part of the BIG-IP product family, the available thresholds are:

  • Bits (per second)
  • Packets (per second)
  • Current Connections

If the server is not part of the BIG-IP product family, such as a generic host server, the available thresholds are:

  • CPU
  • Memory
  • Bits
  • Packets
  • Current Connections

The following procedure provides general instructions for configuring these thresholds. For detailed information on these thresholds, see the online help.

To set limit thresholds for servers

  1. On the Main tab of the navigation pane, expand Global Traffic and click Servers.
    The main screen for servers opens.
  2. Click the name of the server for which you want to set limits.
    The properties screen for that server opens.
  3. From the Configuration list, select Advanced.
    This displays additional fields, and allows you to modify additional default settings.
  4. For Limit Settings, select Enabled from the list that corresponds to the threshold you want to use.
    A new setting appears.
  5. Type the appropriate value for each threshold.
  6. Click the Update button to save your changes.
Note

You can also set limits thresholds on virtual server resources. If a server meets or exceeds its limits settings, both the server and the virtual servers it manages are marked as unavailable for load balancing. You can quickly review the availability of any of your servers or virtual servers in the Statistics screens.

Setting limit thresholds for pools

The available thresholds for which you can set limits for pools are:

  • Bits (per second)
  • Packets (per second)
  • New connections
  • Total connections

The following procedure provides general instructions for configuring these thresholds. For detailed information on these thresholds, see the online help.

To set limit thresholds for pools

  1. On the Main tab of the navigation pane, expand Global Traffic and click Pools.
    The main screen for pools opens.
  2. Click the name of the pool for which you want to set limits.
    The properties screen for that pool appears.
  3. From the Configuration list, select Advanced.
    This displays additional fields, and allows you to modify additional default settings.
  4. For Limit Settings, select Enabled from the list that corresponds to the threshold you want to use.
    A new setting appears.
  5. Type the appropriate value for each threshold.
  6. Click the Update button to save your changes.
Note

You can also set limits thresholds on pool members. If a pool meets or exceeds its limits settings, both the pool and the pool members it manages are marked as unavailable for load balancing. You can quickly review the availability of any of your pools or pool members in the Statistics screens.

Setting limit thresholds for pool members

The available thresholds for which you can set limits for pool members are:

  • Bits (per second)
  • Packets (per second)
  • Connection Rate
  • Current Connections

The following procedure provides general instructions for configuring these thresholds. For detailed information on these thresholds, please see the online help.

To set limit thresholds for pool members

  1. On the Main tab of the navigation pane, expand Global Traffic and click Pools.
    The main screen for pools opens.
  2. Click the name of the pool that contains the pool member.
    The properties screen for that pool appears.
  3. On the menu bar, click Members.
    The members screen opens.
  4. Click the name of the pool member for which you want to set limits.
  5. From the Configuration list, select Advanced.
    This displays additional fields, and allows you to modify additional default settings.
  6. For Limit Settings, select Enabled from the list that corresponds to the threshold you want to use.
    A new setting appears.
  7. Type the appropriate value for each threshold.
  8. Click the Update button to save your changes.

Setting limit thresholds for virtual servers

The available thresholds for which you can set limits for virtual servers are:

  • Bits (per second)
  • Packets (per second)
  • Connection rate
  • Current connections

The following procedure provides general instructions for configuring these thresholds. For detailed information on these thresholds, see the online help.

To set limit thresholds for virtual servers

  1. On the Main tab of the navigation pane, expand Global Traffic and click Servers.
    The main screen for servers opens.
  2. Click the name of the server that contains the virtual server.
    The properties screen for that server opens.
  3. On the menu bar, click Virtual Servers.
    The virtual servers screen opens.
  4. Click the name of the virtual server for which you want to set limits.
  5. From the Configuration list, select Advanced.
    This displays additional fields, and allows you to modify additional default settings.
  6. For Limit Settings, select Enabled from the list that corresponds to the threshold you want to use.
    A new setting appears.
  7. Type the appropriate value for each threshold.
  8. Click the Update button to save your changes.

Discovering resources automatically

The Global Traffic Manager is able to automatically discover virtual servers and links that are associated with any member of the BIG-IP product family. This capability is available through the virtual server discovery option, which identifies virtual servers, and link discovery, which discovers links. When you enable either virtual server or link discovery, the system automatically searches for resources of the specified type, and adds them to the Global Traffic Manager configuration. Discovery options are established on a per-server basis. For more information on discovery options, see Chapter 12, Discovering Resources through Auto-Discovery .

The discovery feature of the Global Traffic Manager supports four settings:

  • Disabled
    When the Discovery setting is set to Disabled, the Global Traffic Manager does not collect any configuration information from the relevant system in the network. Instead, you must make all changes to the configuration manually. This is the default setting.
  • Enabled
    When the Discovery setting is set to ON, the Global Traffic Manager polls the relevant system every 30 seconds to update the configuration information for those systems. Any changes, additions, or deletions are then made to the controller's configuration.
  • Enabled/No Delete
    When the Discovery setting is set to Enabled/No Delete, the Global Traffic Manager polls the relevant system in the network every 30 seconds to update the configuration information for those systems. Any changes or additions are then made to the controller's configuration. Any deletions in the configuration are ignored. This setting is helpful if you want to take systems in and out of service without modifying the Global Traffic Manager configuration.
  • One-time Discovery
    When the Discovery setting is set to One-time Discovery, the Global Traffic Manager polls the relevant system once to update the configuration information for that system. After this initial discovery, the Global Traffic Manager does not poll the system for changes that might have occurred. This feature is useful when you are first installing the Global Traffic Manager on the network and you have a lot of resources to add in, but do not want to have the discovery feature on continually.

Depending on the server you are configuring, you have two discovery options available:

  • On BIG-IP Systems, specifically Local Traffic Managers, you can enable discovery for virtual servers and links.
  • On load balancing servers, you can enable discovery for virtual servers only.

To discover virtual servers

  1. On the Main tab of the navigation pane, expand Global Traffic and click Servers.
    The main screen for servers opens.
  2. Click the name of the server for which you want to discover virtual servers.
    The properties screen for that server appears.
  3. On the menu bar, click Virtual Servers.
    The virtual servers screen opens.
  4. From the Virtual Server Discovery list, select the appropriate setting.
    If you select Disabled, the virtual server list appears, which provides options for adding virtual servers manually.
  5. Click the Update button to save your changes.

To discover links

You can enable discovery for links only on BIG-IP systems.

  1. On the Main tab of the navigation pane, expand Global Traffic and click Servers.
    The main screen for servers opens.
  2. Click the name of the server for which you want to discover links.
    The properties screen for that server opens.
  3. On the menu bar, click Virtual Servers.
    The virtual servers screen opens.
  4. From the Link Discovery option, select the appropriate setting.
  5. Click the Update button to save your changes.

Managing virtual servers

Any server, excluding Global Traffic Managers and Link Controllers, contains at least one virtual server. A virtual server, in the context of the Global Traffic Manager, is a specific IP address and port number that points to a resource on the network. In the case of host servers, this IP address and port number likely point to the resource itself. With load balancing systems, such as the Local Traffic Manager, these virtual servers are often proxies that allow the load balancing server to manage the resource request across a multitude of resources.

You can add virtual servers in two ways:

  • Automatically, through the use of the Global Traffic Manager's discovery feature. For more information on automatically discovering virtual servers, see Discovering resources automatically .
  • Manually, through the properties screens of the given server.

Adding virtual servers manually

The following procedure describes how to add a virtual server manually to a given server. If you want to add virtual servers through the use of the discovery feature, see Discovering resources automatically .

To add a virtual server

  1. On the Main tab of the navigation pane, expand Global Traffic and click Servers.
    The main screen for servers opens.
  2. Click the name of the server to which you want to add virtual servers.
    The properties screen for that server opens.
  3. On the menu bar, click Virtual Servers.
    The virtual servers screen opens.
  4. From the Virtual Server Discovery list, select Disabled.
  5. Click the Update button to implement this change.
  6. Click the Add button to begin adding a new virtual server.
    The new virtual server screen opens.
  7. In the Virtual Server List option, supply the appropriate information for the virtual servers. and then click the Add button to add the virtual server to the server.
    For more information on these options, see the online help.
  8. Click the Create button to save the new virtual server.

Modifying virtual servers

You can modify the information related to a virtual server at any time; for example, if the IP address and port number on the virtual server changes, or if you modify your IP address translation settings.

To edit a virtual server

  1. On the Main tab of the navigation pane, expand Global Traffic and click Servers.
    The main screen for servers opens.
  2. Click the name of the server to which you want to edit virtual servers.
    The properties screen for that server opens.
  3. On the menu bar, click Virtual Servers.
    The virtual servers screen opens.
  4. Click the name of the virtual server that you want to modify.
    The properties page of the virtual server opens.
  5. Edit the virtual server as needed.
    For more information on these options, see the online help.
  6. Click the Finished button to save your changes.

Removing virtual servers

If a virtual server is no longer available on a specific system you can remove it; for example, if the virtual server has been replaced by a newer one.

To remove a virtual server

  1. On the Main tab of the navigation pane, expand Global Traffic and click Servers.
    The main screen for servers opens.
  2. Click the name of the server from which you want to remove virtual servers.
    The properties screen for that server appears.
  3. On the menu bar, click Virtual Servers.
    The virtual servers screen opens.
  4. Check the Select check box that corresponds to the virtual server that you want to remove.
  5. Click the Remove button to remove the virtual server from the server.

Managing links

A link defines a physical connection to the Internet that is associated with one or more routers on the network. When you configure the links that you want to load balance in the Global Traffic Manager. you add a link entry into the Global Traffic Manager and associating one or more routers with that entry. In addition, you can also configure monitors to check certain metrics associated with the link, and modify how the Global Traffic Manager selects a link for network traffic

You can interact with links in the Global Traffic Manager in a variety of ways. You can:

  • Define a link
  • Add routers to a link
  • Assign monitors to a link
  • Configure link weighting and billing properties

Defining links

Before you can load balance inbound and outbound traffic, you must configure the basic link properties. The following procedure describes how to configure the basic properties of a link.

To configure a link

  1. On the Main tab of the navigation pane, expand Global Traffic and click Links.
    The main screen for links opens.
  2. In the Name box, type a name that identifies the link.
  3. For Router Address List, add the router address of the link.
    To add the router address, type the address in the Address box, and then click Add. You can add more than one address to any given link, depending on how that server interacts with the rest of your network.
  4. From the Data Center list, select the appropriate data center.
    A link must be associated with a data center.
  5. Configure the other link options as needed.
    For detailed information on these options, See the online help.
  6. Click the Create button to create the link.

Adding and removing routers

You can add or remove routers associated with a link at any time.

To add a router to a link

  1. On the Main tab of the navigation pane, expand Global Traffic and click Links.
    The main screen for links opens.
  2. Click the name of the link that you want to modify.
    The properties screen for that link opens.
  3. For Router Address List, add the router address of the link.
    To add the router address, type the address in the Address box, and then click Add. You can add more than one address to any given link, depending on how that server interacts with the rest of your network.
  4. Click the Update button to save your changes.

To remove a router from a link

  1. On the Main tab of the navigation pane, expand Global Traffic and click Links.
    The main screen for links opens.
  2. Click the name of the link that you want to modify.
    The Properties screen for that link opens.
  3. For Router Address List, select a router and then click Remove.
    Repeat this step for any other routers that you want to remove.
  4. Click the Update button to save your changes.

Assigning monitors to links

Each link that you add has a variety of monitors available. You can assign these monitors to track specific data, and use that data to determine load balancing or other actions. Detailed information about monitors is available in Chapter 10, Configuring Monitors .

To add monitors to a link

  1. On the Main tab of the navigation pane, expand Global Traffic and click Links.
    The main screen for links opens.
  2. Click the name of the link to which you want to add monitors.
    The properties screen for that server opens.
  3. From the Configuration list, select Advanced.
    This displays additional fields, and allows you to modify additional default settings.
  4. For Health Monitors, use the Move buttons provided to move monitors from the Available list to the Enabled list.
    Monitors in the Enabled list are active for the link.
  5. Click the Update button to save your changes.

Configuring link weighting and billing properties

On the properties screen for a given link, you determine how traffic is managed and distributed, using these settings:

  • Duplex Billing
    If your ISP provider uses duplex billing, you can set the Duplex Billing option so that the statistics and billing report screens accurately reflect the bandwidth usage for the link.
  • Price Weighting
    If you want to load balance traffic based on the cost of the bandwidth, then select the Price (Dynamic Ratio) option. You can use this weighting option to avoid the costs associated with exceeding your prepaid bandwidth. You can also use this weighting option to direct traffic over the least expensive link first.
  • Ratio Weighting
    If you want to load balance the total traffic to the controller based on a ratio, then select the Ratio option. When you have links of varying bandwidth sizes, you can use this weighting option to avoid over saturating a smaller link with too much traffic.
Important

You can use either the price weighting option or the ratio weighting option to load balance your link traffic for all of your links. You cannot use both options. Regardless of which weighting option you use, you must use the same weighting option for all links.

To configure link weighting properties

  1. On the Main tab of the navigation pane, expand Global Traffic and click Links.
    The main screen for links opens.
  2. Click the name of the link to which you want to configure link weighting properties.
    The properties screen for that server opens.
  3. From the Configuration list, select Advanced.
    This displays additional fields, and allows you to modify additional default settings.
  4. From the Weighting list, select either Ratio or Price (Dynamic Ratio), depending on how you want to weight the link.
  5. Configure additional options as needed.
    For more information, see the online help.
  6. Click the Update button to save your changes.

To configure duplex billing properties

  1. On the Main tab of the navigation pane, expand Global Traffic and click Links.
    The main screen for links opens.
  2. Click the name of the link to which you want to configure duplex billing properties.
    The properties screen for that server opens.
  3. From the Configuration list, select Advanced.
    This displays additional fields, and allows you to modify additional default settings.
  4. Check the Duplex Billing option to enable duplex billing for the link.
  5. Click the Update button to save your changes.



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