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[Aldin Setiawan <2104147@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

When creating trunk with a different mtu size(the parent has smaller
than subport) it will be fail and give error "ConflictException: 409".
in example if we create it on cli:

openstack network create --internal --mtu 1500 internal-1
openstack subnet create --network internal-1 --subnet-range 10.10.10.0/24 internal-1-subnet
openstack port create --network internal-1 trunk

openstack network create --internal --mtu 5000 internal-2
openstack subnet create --network internal-2 --subnet-range 20.20.20.0/24 internal-2-subnet
openstack port create --network internal-2 subport

openstack network trunk create --parent-port trunk --subport
port=subport,segmentation-type=vlan,segmentation-id=10 trunk1

it's should trow a error

ConflictException: 409: Client Error for url:
http://38.108.68.19:9696/networking/v2.0/trunks, MTU 5000 of subport
adfe2497-af09-4375-94fa-3133cec89111 cannot be greater than MTU 1500 of
trunk a5791590-b928-4541-84c7-77a2f77ed058.

but if we do the same from horizon it's only showing "Error: Unable to
create the trunk." and "TypeError: response is undefined"

The error message in horizon should be clear to avoid confusion

** Affects: horizon
     Importance: Undecided
         Status: New

** Attachment added: "Screenshot 2025-03-25 204204.png"
   https://bugs.launchpad.net/bugs/2104147/+attachment/5867205/+files/Screenshot%202025-03-25%20204204.png

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https://bugs.launchpad.net/bugs/2104147

Title:
  Unexpected error message when create Trunk

Status in OpenStack Dashboard (Horizon):
  New

Bug description:
  When creating trunk with a different mtu size(the parent has smaller
  than subport) it will be fail and give error "ConflictException: 409".
  in example if we create it on cli:

  openstack network create --internal --mtu 1500 internal-1
  openstack subnet create --network internal-1 --subnet-range 10.10.10.0/24 internal-1-subnet
  openstack port create --network internal-1 trunk

  openstack network create --internal --mtu 5000 internal-2
  openstack subnet create --network internal-2 --subnet-range 20.20.20.0/24 internal-2-subnet
  openstack port create --network internal-2 subport

  openstack network trunk create --parent-port trunk --subport
  port=subport,segmentation-type=vlan,segmentation-id=10 trunk1

  it's should trow a error

  ConflictException: 409: Client Error for url:
  http://38.108.68.19:9696/networking/v2.0/trunks, MTU 5000 of subport
  adfe2497-af09-4375-94fa-3133cec89111 cannot be greater than MTU 1500
  of trunk a5791590-b928-4541-84c7-77a2f77ed058.

  but if we do the same from horizon it's only showing "Error: Unable to
  create the trunk." and "TypeError: response is undefined"

  The error message in horizon should be clear to avoid confusion

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