Assuming I've got four C3750X, each side stacked with Stackwise Plus and using RSTP:
C1 -----10Gbit----- C2
| |
| |
SW SW
| |
| |
C3 -----10Gbit----- C4
Would the second 10Gbit-uplink in RSTP alternate or backup state?
Edit: The two 10Gbit lines are provided by two different carriers with two different round-time-trips (due to different fibre lengths)