Overview: Integrating BIG-IP DNS (formerly GTM) with other BIG-IP systems on a Setting Up a BIG-IP DNS Redundant System Configuration. Hi, Does anyone have any example GTM configurations to provide GSLB to LTMs? and reading this guide: Having said that, here are some simple configuration commands via tmsh for configuring a GTM for initial use. Integrating BIG-IP GTM Into a Network with BIG-IP LTM Overview: Configuring how and when GTM saves configuration changes GTM never saves changes to the configuration (manual save required).
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About listeners A listener is a specialized virtual server that passively checks for DNS packets on port 53 and the IP address you assign to the listener. The number of listeners you create depends on your network configuration and the destinations to which you want to send specific queries.
A wildcard listener is a special listener that is assigned an IP address of 0. When you assign a Prober pool to a data center, by default, the servers in that data center inherit that Prober pool. The members of a Prober pool perform monitor probes of servers to gather data about the health and performance of the resources on the servers. If all of the members of a Prober pool are marked down, or if a server has no Prober pool assigned, BIG-IP GTM reverts to a default intelligent probing algorithm to gather data about the resources on the server.
This figure illustrates how Prober pools work. These statistics reflect only the number of Probe requests and their success or failure. These statistics do not reflect the actual probes that the pool members made to servers on your network. The status of a Prober pool also indicates the status of the members of the pool. If at least one member of a Prober pool has green status Availablethe Prober pool has green status. When you upgrade from version The name of the new Prober pool is based on the IP address of the original Statistics Collection server.
If the original Statistics Collection server had an IP address of An LDNS entry can be in one of three states: New, Pending, or Active. In general, the New and Pending states are temporary. This table describes the protocols and ports the big3d agent uses to communicate with an LDNS when collecting path data for the local DNS servers.
A wide IP maps a fully-qualified domain name FQDN to one or more pools of virtual servers that host the content of a domain. You can use one or more question marks or asterisks, or both question marks and asterisks in a wide IP name or alias. Most load balancing methods divide DNS name resolution requests among available pools or virtual servers.
For example, when a user visits a web site, multiple DNS name resolution requests are generated as the user moves from page to page. In certain circumstances, you might want to ensure that a user remains with a given set of resources throughout the session.
For example, a user attempting to conduct on online banking transaction needs to remain with the same set of resources to ensure that the transaction is completed successfully. When you design your network, ensure that this particular pool is kept in reserve and not used as part of the normal global server load balancing. All of the resources on your network are associated with a data center. GTM uses guixe data to conduct load balancing and route client requests to the best-performing v5 based on different factors.
GTM might send all requests to one data center when another data center is down. Alternatively, GTM might send a request to the data center that has the fastest f time. A third option might be for GTM to send a request to the data center that is located closest to the client’s source address.
A server defines a physical system on the network. Servers contain the virtual servers that are the ultimate destinations of DNS name resolution requests. A host is a network resource that is not a part of the BIG-IP product family and does not provide load balancing. 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.
A pool 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. Guid 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. A link is a logical representation of a physical device router that connects your network to the Internet. 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:. 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:. The ZoneRunner utility updates named. A DNS view is a modification of a nameserver configuration based on the community attempting to access it. Using views, you can build multiple nameserver configurations on the same server, and have those configurations apply dynamically when the request originates from a specified source.
If your DNS handles requests from both inside and outside your company, you can create two views: The first generation of a key has an ID of 0 zero. Over time, each generation of a key overlaps the previous generation of the key ensuring that GTM can respond to a DNSSEC query even if one generation of a key becomes unavailable. The value of the TTL time-to-live of a key specifies how long a client resolver can cache the key. Was this resource helpful in solving your issue? Please do not provide personal information.
Sign Up Login My Support. About wildcard listeners A wildcard listener is a special listener that is assigned an IP address of 0. BIG-IP systems with prober pools. Prober pool statistics displayed per system. About Prober pool status The status of a Prober pool also indicates the status of the members of the pool.
Flow of probe process. Converting a statistics collection server to a Prober pool automatically In version Protocols and ports used by big3d during communications with local DNS servers This table describes the protocols and ports the big3d agent uses to communicate with an LDNS when collecting path data for the local DNS servers.
Use to replace a single character, except a dot. Valid uses of wildcard characters for the wide IP name www. Using wildcard characters in wide IPs to minimize maintenance tasks Determine the domain names and aliases for which you want to configure wide IPs.
Create a wide IP using wildcard characters in the name to represent a domain when you have a large quantity of aliases that you want to use for the domain. You can use two different wildcard characters in the wide IP name: This reduces the number of aliases you have to add to the configuration.
About persistence connections Most load balancing methods divide DNS name resolution requests among available pools or virtual servers. Configuring a wide IP with a last resort pool Ensure that a pool of virtual servers that is not part of the normal global server load balancing operations exists in the configuration.
Create a wide IP to map a FQDN to one or more pools of virtual servers that host the content of the domain, and assign a last resort pool to the wide IP.
About data centers All of the resources on your network are associated with a data center. The resources associated with a data center are available only when the data center is also available.
About servers A server defines a physical system on the network. 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.
About third-party 5f servers A host is a network resource that is not a part of the BIG-IP product family and does not provide load balancing. About virtual servers A virtual server is a specific IP address and port number that points to a resource on the network. 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 gym.
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 giide 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.
The big3d agent on the new primary blade must be up and functioning within 90 seconds the timeout cofniguration of the BIG-IP monitor. About pools and pool members A pool is a coniguration of virtual servers that can reside on multiple servers. To illustrate the difference between pool members and virtual servers, consider the fictional company SiteRequest.
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This virtual server is the primary resource for DNS name resolution requests for the company gtk 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.
AskF5 | Manual: BIG-IP Global Traffic Manager: Load Balancing
configuratikn Defining a link Ensure that at least one data center exists in the configuration. Gather information about the routers that you want to define as links, including: IP addresses Data center location. Link names are limited to 63 characters. The big3d agent can now gather and analyze path and metrics information about outbound traffic passing through the router the link represents.