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Product Manuals and Release notes
Service providers can configure the BIG-IP DNS system to increase the availability of their customer services on the System Architecture Evolution (SAE) network. One way is to configure a GTP monitor for the health and availability of a packet gateway (PGW). The GTP monitor issues an echo request to a list of PGW systems. If a PGW fails to respond to the GTP echo request, it is marked as down, and removed from the list of available PGW systems that are returned to an MME in a DNS response. BIG-IP DNS can also be configured to load balance DNS queries for the access point name (APN) across the PGW systems that are active and available.
This illustration presents a simplified depiction of how the process works on the SAE network.
BIG-IP DNS monitoring packet gateways
Option | Description |
---|---|
Inside Data Center | By default, select probers inside the data center. |
Outside Data Center | Select probers outside the data center. |
Specific Prober Pool | Select one of the Probers from the drop-down list. When you want to
assign a Prober pool at the data center level. Note: Prober pools are not used by the bigip monitor. |
Option | Description |
---|---|
Any Available | By default, select any available prober. |
Inside Data Center | Select probers inside the data center. |
Outside Data Center | Select probers outside the data center. |
None | No fallback probers are selected. Prober fallback is disabled. |
Specific Prober Pool | Select one of the Probers from the drop-down list. When you want to assign a Prober pool at the data center level. |
Option | Description |
---|---|
Inherit From Data Center | By default, a server inherits the prober preference selection assigned to the data center in which the server resides. |
Inside Data Center | A server selects the probers from inside the data center where the server resides. |
Outside Data Center | A server selects the probers from outside the data center where the server resides. |
Specific Prober Pool | Select one of the prober pools
from the drop-down list. When assigning the prober pool at the server
level. Note: Prober pools are not used by the bigip monitor. |
Option | Description |
---|---|
Inherit From Data Center | By default, a server inherits the prober fallback selection assigned to the data center in which the server resides. |
Any Available | For selecting any available prober. |
Inside Data Center | A server selects probers from inside the data center where the server resides. |
Outside Data Center | A server selects probers from outside the data center where the server resides. |
None | No fallback probers are selected. Prober fallback is disabled. |
Specific Prober Pool | Select one of the probers from the list When you want to assign a prober pool at the server level. |
Option | Description |
---|---|
All Health Monitors | By default, specifies that all of the selected health monitors must be successful before the server is considered up (available). |
At Least | The minimum number of selected health monitors that must be successful before the server is considered up. |
Require | The minimum number of successful probes required from the total number of probers requested. |
Option | Description |
---|---|
Disabled | The system does not use the discovery feature to automatically add virtual servers. This is the default value. Use this option for a standalone BIG-IP DNS system or for a BIG-IP DNS/LTM combo system when you plan to manually add virtual servers to the system, or if your network uses multiple route domains. |
Enabled | The system uses the discovery feature to automatically add and delete virtual servers. Use this option for a BIG-IP DNS/LTM combo system when you want the BIG-IP DNS system to discover LTM virtual servers. |
Enabled (No Delete) | The system uses the discovery feature to automatically add virtual servers and does not delete any virtual servers that already exist in the configuration. Use this option for a BIG-IP DNS/LTM combo system when you want the BIG-IP DNS system to discover LTM virtual servers. |
Option | Description |
---|---|
Disabled | The system does not use the discovery feature to automatically add links. This is the default value. Use this option for a standalone BIG-IP DNS system or for a BIG-IP DNS/LTM combo system when you plan to manually add links to the system. |
Enabled | The system uses the discovery feature to automatically add and delete links. Use this option for a BIG-IP DNS/LTM combo system when you want BIG-IP DNS to discover links. |
Enabled (No Delete) | The system uses the discovery feature to automatically add links and does not delete any links that already exist in the configuration. Use this option for a BIG-IP DNS/LTM combo system when you want BIG-IP DNS to discover links. |
Create a custom GTP monitor to detect the presence and health of a packet gateway (PGW) system. The GTP monitor issues a GTP echo request, and if the PGW system fails to respond, it is automatically marked as down and removed from the available list of PGW systems that the BIG-IP system returns to an MME.
Option | Description |
---|---|
NAPTR | The Name Authority Pointer record, NAPTR, aids in the standardization of Uniform Resource Names (URNs). NAPTR records map between sets of URNs, URLs and plain domain names, and suggest to clients the protocols available for communication with the mapped resource. |
A | The Address record, or A record, lists the IP address for a given host name. |
SRV | The Service resource record, SRV, is a pointer with which an alias for a given service is redirected to another domain. |
CNAME | The Canonical Name resource record, CNAME, specifies an alias or nickname for the official, or canonical, host name. |
AAAA | The IPv6 Address record, or AAAA record, lists the 128-bit IPv6 address for a given host name. |
MX | The Mail Exchange resource record, MX, defines the mail system(s) for a given domain. |