On an EX9200 using EX9200-15C (AFT based linecards), ingress traffic will be dropped if the interface is configured with vlan id and vlan name 

root@EX9214-Lab> show configuration interfaces ae1 | display set 
set interfaces ae1 esi 00:00:00:00:00:01:01:01:01:01
set interfaces ae1 esi all-active
set interfaces ae1 unit 0 family ethernet-switching interface-mode trunk
set interfaces ae1 unit 0 family ethernet-switching vlan members V100
set interfaces ae1 unit 0 family ethernet-switching vlan members V200
set interfaces ae1 unit 0 family ethernet-switching vlan members V300
set interfaces ae1 unit 0 family ethernet-switching vlan members V400

set routing-instances JTAC_VSWITCH interface ae1.0

root@EX9214-Lab> configure 
Entering configuration mode

[edit]
root@EX9214-Lab# set interfaces ae1 unit 0 family ethernet-switching vlan members 500 

[edit]
root@EX9214-Lab# show | compare
[edit interfaces ae1 unit 0 family ethernet-switching vlan]
- members [ V100 V200 V300 V400];
+ members [ 500 V100 V200 V300 V400];

The above configuration will drop traffic for all vlans except vlan id 500 

Only use vlan names and don't use vlan id 

[edit]
root@EX9214-Lab# delete interfaces ae1 unit 0 family ethernet-switching vlan members 500 

[edit]
root@EX9214-Lab# set interfaces ae1 unit 0 family ethernet-switching vlan members V500  

[edit]

root@EX9214-Lab# show | compare
[edit interfaces ae1 unit 0 family ethernet-switching vlan]
- members [ V100 V200 V300 V400];
+ members [ V100 V200 V300 V400 V500];

10-30-2025 Initial Draft