Hi Abdul,
This depends if the interfaces are listed in the ifTable of the Mib-2. Spectrum reads the iftable upon discovery and creates the interfaces that it finds in Spectrum.
It is possible that the vendor does not populate the mib-2 and has their own vendor specific location. If this is the case then the device would require certification in Spectrum.
Easiest way to see this would be to query the device from Spectrum MibTools from the Iftable location (1.3.6.1.2.1.2.2).
best regards,
Glenn