Bug ID 577580: GTM/BIG-IP DNS cannot discover LTM virtual servers with identical IP:port combinations, even if on different VLANs

Last Modified: Mar 21, 2019

Bug Tracker

Affected Product:  See more info
BIG-IP GTM(all modules)

Known Affected Versions:
11.5.1, 11.5.1 HF1, 11.5.1 HF10, 11.5.1 HF11, 11.5.1 HF2, 11.5.1 HF3, 11.5.1 HF4, 11.5.1 HF5, 11.5.1 HF6, 11.5.1 HF7, 11.5.1 HF8, 11.5.1 HF9, 11.5.2, 11.5.2 HF1, 11.5.3, 11.5.3 HF1, 11.5.3 HF2, 11.5.4, 11.5.4 HF1, 11.5.4 HF2, 11.5.4 HF3, 11.5.4 HF4, 11.5.5, 11.5.6, 11.5.7, 11.5.8, 11.5.9, 11.6.0, 11.6.0 HF1, 11.6.0 HF2, 11.6.0 HF3, 11.6.0 HF4, 11.6.0 HF5, 11.6.0 HF6, 11.6.0 HF7, 11.6.0 HF8, 11.6.1, 11.6.1 HF1, 11.6.1 HF2, 11.6.2, 11.6.2 HF1, 11.6.3,,,,, 11.6.4, 12.0.0, 12.0.0 HF1, 12.0.0 HF2, 12.0.0 HF3, 12.0.0 HF4, 12.1.0, 12.1.0 HF1, 12.1.0 HF2, 12.1.1, 12.1.1 HF1, 12.1.1 HF2, 12.1.2, 12.1.2 HF1, 12.1.2 HF2, 12.1.3,,,,,,,, 12.1.4

Opened: Mar 02, 2016
Severity: 3-Major
Related AskF5 Article:


GTM/BIG-IP DNS cannot discover LTM virtual servers created on different VLANs, using identical IP:port combinations.


Only one of the virtual servers will be autodiscovered and added to the GTM/BIG-IP DNS config. Which one depends on the order in which they are processed by the GTM/BIG-IP DNS system.


On an LTM system, two virtual servers are created: /Common/vsname1 /Common/vsname2 on different VLANs. Auto discovery is enabled on the GTM system.


When this occurs, there will be only one virtual server on the GTM/BIG-IP DNS server config with the specified IP/Port ( There are 2 possible workarounds: 1. Remove this virtual server from the GTM/BIG-IP DNS server config. At the next autoconfig interval, both virtual servers will be added to the GTM/BIG-IP DNS Server config. 2. This has two parts. Assuming that 'vsname1' has been added to the GTM/BIG-IP DNS config during autodiscovery. A. Modify the vsname1 on the GTM/BIG-IP DNS system and set the LTM NAME property to match the name of the virtual server on the LTM system (vsname1). B. Manually add vsname2 to the GTM/BIG-IP DNS config, setting the LTM NAME to match the name of the virtual server on the LTM system (vsname2).

Fix Information


Behavior Change