HoangHien wrote

I dont want to configure each AP with different SSID (no point to roam).

 

Any configuration can solve this problem?

There is also no point to roam if the Roaming Domain (= the APs in the same broadcast domain) would change. Applications which require session persistence (such as VoIP for example) would lose the connection to the client device.

What you want to achieve with roaming is session persistence. To provide this, you need a mechanism to allow a station to maintain the same Layer 3 address while roaming throughout a multi-VLAN network. RFC2002¹ (IP Mobility Support) describes a technique to allow roaming between different Roaming Domains while keeping the same IP address.  However, as far as I know the Omada ecosystem does not support IP Mobility, at least not at this time.

¹ https://tools.ietf.org/html/rfc2002