3Com 9100 manual Profile Name Priority Minimum Bandwidth Maximum Bandwidth

QoS Profiles 101

A QoS profile does not alter the behavior of the switch until it is assigned to a traffic grouping. The settings of the default profiles are shown in Table 25.

Table 25 Default QoS Profiles

Profile Name	Priority	Minimum Bandwidth	Maximum Bandwidth
qp1	Low	0%	100%
qp2	LowHi	0%	100%
qp3	Normal	0%	100%
qp4	NormalHi	0%	100%
qp5	Medium	0%	100%
qp6	MediumHi	0%	100%
qp7	High	0%	100%
qp8	HighHi	0%	100%

Modifying a QoS You can modify the profile defaults as desired. To modify the parameters Profile of an existing QoS profile, use the following command:

config qosprofile <qosname> {minbw <percent>}

{maxbw <percent>} {priority <level>}

The QoS profiles qp1 through qp8 are mapped directly to the eight hardware queues on every switch port. Any changes to parameters of the eight pre-defined QoS profiles have the corresponding effect on the ports. The direct mapping is straight-forward to understand and configure.

Queue setting at any instant at a port depends on the QoS profiles associated with the traffic through that port. The minimum bandwidth is the sum of all the minimum values of the QoS profiles sharing a queue. The maximum bandwidth setting is equal to the highest bandwidth setting of all the profiles that are sharing that queue.