@alagoutte wrote: but not on all ArubaCX product... (only 83xx and after ?)
Exactly Alexis, you're right!
The VLAN translation feature was, at least initially (ArubaOS-CX 10.03), introduced only on Aruba 8320, 8325 and 8400X Switch series because those hardware platforms were the only available at time...but with the subsequent release of ArubaOS-CX 10.04 (and newer 10.05) that feature was extended also to Aruba 6300/6400 Switch series (I'm not sure it is really available on the Aruba 6200 too [*]).
[*] On the ArubaOS-CX 10.05 Command-Line Interface Guide for Aruba 6200 Switch Series there aren't references about vlan translation and show vlan translation commands found instead on CLI Guides related to Aruba 8320, 8325, 8400X and 6300/6400 Switch series.