F5 GTM CONFIGURATION GUIDE PDF

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A virtual server 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, virtual servers are often proxies that allow the load balancing server to manage a resource request across a multitude of resources. Configuring virtual server availability to be dependent on the status of other virtual servers Ensure that multiple virtual servers are configured on the server. Determine the virtual servers upon which you want the availability of a virtual server to be dependent.

Configure a virtual server to be available based on the availability of other virtual servers by configuring a Dependency List for the virtual server.

The Server List screen opens. In the Server List, click a server name. The server settings and values display. On the menu bar, click Virtual Servers. A list of the virtual servers configured on the server displays. In the Virtual Servers list, click a virtual server name. The virtual server settings and values display. From the Configuration list, select Advanced. Additional controls display on the screen. In the Dependency List area, from the Virtual Servers list, select each virtual server on which you want the virtual server to be dependent, and then click Add.

The virtual servers display in the list as you add them. Click Finished. The virtual server is now available only when the virtual servers on the dependency list are also available. Configuring virtual server status for clusters You can configure virtual server status to be dependent only on the timeout value of the monitor associated with the virtual server.

This ensures that when the primary blade in a cluster becomes unavailable, the gtmd agent on the new primary blade has time to establish new iQuery connections with and receive updated status from other BIG-IP systems. Tip: The big3d agent on the new primary blade must be up and functioning within 90 seconds the timeout value of the BIG-IP monitor. The General configuration screen opens. Click Update. About pools and pool members A is a collection of virtual servers that can reside on multiple servers.

A virtual server is a combination of IP address and port number that points to a specific resource on the network. When you add a virtual server to a pool, it becomes a pool member.

A pool member is a virtual server that has attributes that pertain to the virtual server only in the context of the pool. A virtual server can be a member of multiple pools and have different attributes in each pool. To illustrate the difference between pool members and virtual servers, consider the fictional company SiteRequest.

This virtual server is the primary resource for DNS name resolution requests for the company web page that originate from Europe. This virtual server is also the backup resource for requests that originate from the United States.

Because these are two distinctly different roles, the virtual server is a pool member in two different pools. The IT team can use this configuration to customize the virtual server for each pool to which it belongs, without modifying the actual virtual server itself.

About links A link is a logical representation of a physical device router that connects your network to the Internet. Defining a link Ensure that at least one data center exists in the configuration. The Links list screen opens. Click Create. The New Link screen opens. Type a name for the link. Important: Link names are limited to 63 characters.

Specify whether the link uses address translation when communicating between the network and the Internet. Type the IP address of a router in the Address field, and then click Add. You can add more than one IP address, depending on how the server on which you are creating the link interacts with the rest of your network. Select the data center where the router that the link represents resides.

The system uses the statistics that the router returns to distinguish between internal-only traffic and traffic destined for the Internet.

The big3d agent can now gather and analyze path and metrics information about outbound traffic passing through the router the link represents. Load balancing outbound traffic through links of differing bandwidths Ensure that at least one data center exists in the configuration. Gather the following information about the routers that you want to define as links: IP addresses Data Center location When you want to avoid sending too much outbound traffic to a router with lower bandwidth, configure the links that represent your routers for ratio weighting.

Important: You must use the same weighting option for all of the links on your network. From the Weighting list, select Ratio, when you want BIG-IP to continuously check the performance of each link and route outbound traffic through the link with the best performance data. Price Dynamic Ratio Specifies that the system uses dynamic ratio methodology when selecting the link.

If you selected Ratio from the Weighting list, in the Link Ratio field, type the frequency at which the system sends traffic through the link. Load balancing outbound traffic over the least expensive link first Ensure that at least one data center exists in the configuration. Gather the following information about the routers that you want to define as links: IP addresses Data Center location When you want to load balance outbound traffic to a router with the lowest fees first, configure the links that represent your routers for price weighting.

Configuring statistics to reflect link bandwidth usage Your ISP providers must use duplex billing. When you want the BIG-IP system to display statistics that reflect link bandwidth usage, configure duplex billing.

Click a link name. Select the Duplex Billing check box when the ISP that provides the link bills for bandwidth usage based on a maximum amount of inbound or outbound traffic whichever is higher , rather than billing for bandwidth usage based on the total inbound and outbound traffic.

The Link List screen displays. About distributed applications A distributed application is a collection of one or more wide IPs, data centers, and links that serve as a single application to a web site visitor.

Configuring a distributed application provides several advantages: You can organize logical network components into groups that represent a business environment. You can configure a distributed application to be dependent upon the availability of a data center, server, or link. This dependency ensures that a user cannot access a distributed application when a portion of the resources are unavailable.

You can define persistence for the distributed application, ensuring that a user, who accesses the distributed application uses the same resources during a single session. If the New York data center goes offline, a wide IP in that data center becomes unavailable. A distributed application associated with that wide IP also becomes unavailable. Consequently, the system does not send resolution requests to any of the distributed application resources, until the entire application becomes available again.

With the ZoneRunner utility, you can: Import and transfer DNS zone files Manage zone resource records Manage a local nameserver and the associated configuration file, named. The ZoneRunner utility updates named. Using ZoneRunner to configure named. Use ZoneRunner to edit named. Zonerunner provides an automatic syntax check and displays error messages to help you write the correct syntax. The named Configuration screen opens. In the Options area, type additional configurations per your network design.

Creating a master DNS zone A master zone is authoritative. The Zone List screen opens. The New Zone screen opens. From the View Name list, select external. The external view is a default view to which you can assign zones. In the Zone Name field, type a period character. From the Zone Type list, select Master. Clear the Zone File Name field, and type the zone file name.

If you want further help creating a custom zone file, see SOL Creating a hint zone Hint zones designate a subset of the root nameservers list. When the local nameserver starts or restarts , the nameserver queries the root servers in the hint zone for the most current list of root servers. The root hint is built into BIND version 9. From the Zone Type list, select Hint.

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