Mar 27, 2026 - For details about updated CVE-2025-53521 (BIG-IP APM vulnerability), refer to K000156741.

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bohyun's avatar
bohyun
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3 years ago

Can Vlan tag checking disable on LTM?

Hello,

version: 14.1.5

I'm deploying Voice Recording Server LB.  LTM recevies mirrored traffic by switch which connected directly. The traffics seperated each direction on mirrored switch and then it send taffics two ports connected LTM. one port dedicated Rx traffic, another port dedicated Tx traffic. Also LTM seperated Rx, Tx ports and seperated vlans. The vlans are untagged.

I found out some of the traffic dropped. the dropped taffices have vlan tag. I try to configure tagged vlan number Rx, Tx directions. Unfortunately, can't set the same vlan tag number at the same time. one-way voice failure..

I want to forward the tagged packets  like untagged packets. Can Vlan tag checking disable on LTM ? 

 

3 Replies

  • that might be vlan source checking but I haven't set that up before so I'm not sure...maybe this will help? A drawing would help on my end to see what you're trying to accomplish, I think I'm missing something.

    https://community.f5.com/t5/technical-forum/vlan-source-checking/m-p/255761#M239455

    You could also look in the key database to see if something exists for that:

    tmsh list sys db | grep vlan

    This one looks promising:

    sys db bcm56xxd.hgvlan_check_disable {

  • are you saying that you want to have both tagged and untagged traffic on the same interface?