Hi.
Have you tried "display mac-address summary slot 0"?
Example for S6720:
Summary information of slot 0:
-----------------------------------
Static : 0
Blackhole : 0
Dyn-Local : 2
Dyn-Remote : 0
Dyn-Trunk : 0
Sticky : 0
Security : 0
Sec-config : 0
Authen : 0
Guest : 0
Mux : 0
Snooping : 0
Pre-Mac : 0
In-used : 2
Capacity : 65536-----------------------------------