You can configure the card interface working mode to use interfaces on a card based on actual requirements.
Only S6720-C-SI series switches support this configuration.
S6720-C-SI series switches support extended cards. However, the four 10GE SFP+ Ethernet optical interfaces on the front panel and interfaces on the extended cards (excluding the 4*10GE card) cannot be used simultaneously. By default, a switch uses interfaces on the panel. To use interfaces on a card, run the undo set device port-config-mode port-on-board enable command to configure the card interface working mode. Interfaces on the panel then cannot be used.