I understand that both CFC and DFC3C cards are comptable with line cards in a VSS system. However, I would like to know whether it is possible to have a mix of these CFC & DFC3C line cards within a VSS system. e,g 2 CFC line cards and 2 DFC3C cards. If it is possible what are the potential shortcomings? Will the line cards perform at the lowest common denominator in the VSS system- so at CFC?
The CFC has no local DFC (no local switching is performed and the module will use the PFC for switching) so the lowest common denominator does not apply here.
If you were to have a DFC3B, then you won't get VSS Support as it demands DFC3C on modules supporting local switching.