Each port group can operate in either oversubscription mode or performance mode. In
oversubscription mode, you can use up to 4 ports in the port group. In performance mode,
only the first port of the port group is enabled, and that port comes with enhanced buffering and
quality-of service (QoS) functionality. The other 3 ports in the port group will be administratively shut
down. The 16-port 10 Gigabit Ethernet module works in oversubscription mode by default.
Reference Link
The 6716 has sixteen TenGig ports that are segregated into four distinct port groups, each of which is controlled by a single port ASIC. The module has the ability to operate in 'oversubscription' mode or in
'performance' mode. This ability provides the flexibility of connecting some ports to servers while using other ports for wiring closet uplinks.
The port ranges for each of the four port groupings on the 6716 are as follows: 1-4, 5-8, 9-12, 13-16.
The software command
router(config)#[no] hw-module slot x oversubscription port-group y
will put port group y (1, 2, 3, or 4) in performance mode and administratively disable the oversubscribed ports (ports 2-4 in port group 1, ports 6-8 in port group 2, ports 10-12 in port group 3, and ports 14-16 in port group 4) and put them in shutdown state. In this mode, the user cannot do "no shut" on the disabled ports.
To display the current configuration of all the port groups in slot x. Run
Router# show hw-module slot x oversubscription
Reference Link
