Sup720-10GE Buffers

The Supervisor 720-10G (VS-S720-10G) has (3) 1 GE and (2) 10 GE ports.  If you don't use the 1GE ports, you can administratively disable them, toggle a global QoS feature, and get a better buffer structure for your 10GE ports.  It's done with a global command:

mls qos 10g-only

Here is the queue structure before and after:

Before:
    Receive    2q4t    (128 MB)
    Transmit   1p3q4t  (112 MB)

After:
    Receive    8q4t    (128 MB)
    Transmit   1p7q4t  (112 MB)