Extreme Networks Summit1 manual QOS Mode, Default QOS Profiles

QUALITY OF SERVICE (QOS)

QoS profiles are assigned to traffic classifications, independent of the QoS mode chosen, in order to modify switch forwarding behavior.

QOS MODE

There are two modes of QoS. Ingress mode, the default, can use a wide variety of traffic classifications, but has a limitation of being able to use only the default four QoS profiles. You can modify the bandwidth parameters of the default QoS profiles.

Using egress mode, you can define additional QoS profiles, but you must use a smaller selection of traffic classifications. You can modify both the prioritization and bandwidth parameters of user-defined QoS profiles.

DEFAULT QOS PROFILES

Four default QoS profiles are provided that cannot be deleted. The default QoS profile names are as follows:

•qp1

•qp2

•qp3

•qp4

The default QoS profiles exist in either ingress or egress mode. In ingress mode, only the default QoS profiles are observed. In egress mode, up to 28 additional custom profiles may be defined, for a total of 32. You cannot create custom profiles in ingress mode.

The parameters that make up a QoS profile include the following:

•Minimum bandwidth — The minimum percentage of bandwidth that the traffic requires. The switch is required to provide the minimum amount of bandwidth to the traffic. The lowest possible value is 0%.

•Maximum bandwidth — The maximum percentage of bandwidth that the traffic is permitted to use.

•Priority — The level of priority in which the traffic will be serviced by the switch. Choices include:

—Low

—Normal

8-2 SUMMIT SWITCH INSTALLATION AND USER GUIDE