The article explains that reason behind the commit failure when an interface is configured with vlan-tagging and ethernet-switching on the same interface.

In QFX10k platforms, an interface cannot be configured with vlan-tagging and family ethernet-switching.

In releases prior to 21.2R3-S5, commit would complete with just warning thrown as below.

In 17.3R3-S3

[edit]

root@jtac-QFX10008# show | compare 

[edit interfaces et-7/0/6]

+ vlan-tagging;

+ unit 211 {

+  vlan-id 211;

+  family inet {

+   address 10.175.0.178/31;

+  }

+ }

+ unit 4093 {

+  vlan-id 4093;

+  family ethernet-switching {

+   vlan {

+    members v711;

+   }

+  }

+ }

[edit]

root@jtac-QFX10008# commit 

[edit interfaces]

 'et-7/0/6'

 Configuration vlan-tagging is not supported with ifl family ethernet-switching <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<

commit complete

But from releases 18.4 and beyond, the commit would fail as shown

In 21.2R3-S5

root@jtac-QFX10008# show | compare 

[edit interfaces et-7/0/6]

+ vlan-tagging;

[edit interfaces et-7/0/6]

+ unit 211 {

+  vlan-id 211;

+  family inet {

+   address 10.175.0.178/31;

+  }

+ }

+ unit 4093 {

+  vlan-id 4093;

+  family ethernet-switching {

+   vlan {

+    members v711;

+   }

+  }

+ }

[edit]

root@jtac-QFX10008-r019# commit check 

[edit interfaces]

 'et-7/0/6'

 Configuration vlan-tagging is not supported with ifl family ethernet-switching vlan members

error: configuration check-out failed

[edit]

There is no solution. An interface in QFX10k cannot be configured with vlan-tagging and ethernet-switching as well as the PFE do not support it.