I have a question about vlangroup.

Hello, 

Thank you for posting your question regarding your vlan set up. I would like to suggest if you have an active support contract on your device with F5 that you create a support case as this may require more personal specific configuration information to determine the difference. It's ideal to not have specific details regarding your set up in a public forum. Cases can be created via https://my.f5.com/manage/s/ or by calling the support line North America Toll-Free : 1-888-882-7535 or International: +800 11-275435 or +1-206-272-6888. Also here is some information on VLANs that you can review to see if it helps in answering your question prior to creating a case. 

Please let us know if any of this helps answer your question or gets you in the correct direction. 

Thank you, 

Melissa