Public bug reported:

if my interfaces file contains an entry for vlan 0 (e.g. ens19.1991.0)
the vname naming schema is automatically changed from no_pad to pad

but I do need the no pad schema.

it looks like /etc/network/if-pre.up/vlan works incorrect during startup
phase.

Is there any way to fix the schema or is padding a must for prio tag ?


auto ens19
iface ens19 inet manual

auto ens19.1991
iface ens19.1991 inet manual
   vlan-raw-device ens19

auto ens19.1991.4090
iface ens19.1991.4090 inet manual
   vlan-raw-device ens19.1991

auto br_TB991_DPU
iface br_TB991_DPU inet static
   address 10.160.60.1
   netmask 255.255.255.240
   dns-nameservers 10.160.5.2
   bridge_ports ens19.1991 ens19.1991.4090 ens19.1991.0
   bridge_stp off
   bridge_fd 0
   bridge_maxwait 0
   pre-up ifup ens19

auto ens19.1991.0
iface ens19.1991.0 inet manual
   vlan-raw-device ens19.1991

** Affects: vlan (Ubuntu)
     Importance: Undecided
         Status: New

** Description changed:

  if my interfaces file contains an entry for vlan 0 (e.g. ens19.1991.0)
  the vname naming schema is automatically changed from no_pad to pad
  
  but I do need the no pad schema.
  
  it looks like /etc/network/if-pre.up/vlan works incorrect during startup
  phase.
  
  Is there any way to fix the schema or is padding a must for prio tag ?
+ 
+ 
+ auto ens19
+ iface ens19 inet manual
+ 
+ auto ens19.1991
+ iface ens19.1991 inet manual
+    vlan-raw-device ens19
+ 
+ auto ens19.1991.4090
+ iface ens19.1991.4090 inet manual
+    vlan-raw-device ens19.1991
+ 
+ auto br_TB991_DPU
+ iface br_TB991_DPU inet static
+    address 10.160.60.1
+    netmask 255.255.255.240
+    dns-nameservers 10.160.5.2
+    bridge_ports ens19.1991 ens19.1991.4090 ens19.1991.0
+    bridge_stp off
+    bridge_fd 0
+    bridge_maxwait 0
+    pre-up ifup ens19
+ 
+ auto ens19.1991.0
+ iface ens19.1991.0 inet manual
+    vlan-raw-device ens19.1991

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https://bugs.launchpad.net/bugs/1722534

Title:
  vlan naming scheme different between interfaces conf and run time
  change

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