QoS General Config uration

QoS Modes

You can select the QoS mode of the system, which then applies to all ports in the system.

The following describe the QoS modes:

Basic Mode

Basic mode deals with Class of Service (CoS).

Its basic feature is that all traffic receives the same treatment, which is the single QoS action of determining the egress queue on the egress port based on the QoS value in the incoming frame. This is the VPT value in Layer 2 and the DSCP value in Layer 3. This value is determined by external factors and trusted by the system, which has no control over it in Basic Mode.

The value to be trusted is entered in the Global Settings Page. The egress queue to which the traffic is assigned is selected in the Cos to Queue Page or the DSCP to Queue Page page (depending on whether the trust mode is CoS or DSCP, respectively).

Advanced Mode

Advanced mode deals with Quality of Service (QoS).

Advanced mode, as opposed to Basic mode, has the following increased possibilities:

Traffic can be divided into subsets by matching it to various criteria, even if it arrives from several ports at once. Various actions can be performed to each subset.
More diverse actions can be performed to a subset of traffic, including: setting the egress queue, setting the DSCP value, or passing traffic through a policer to measure and decide what to do about excess traffic.
Disable Mode

In this mode all traffic is mapped to a single best effort queue, so that no type of traffic is prioritized over another.

Only a single mode can be active at any time. When the system is configured to work in QoS Advanced mode, settings for the QoS Basic mode are not active and vice versa.This means, for example, that 802.1P is not available when operating in QoS Advanced mode.

When changing modes, the following occurs:

When changing from QoS Advanced mode to any other mode, policy profile definitions and class maps are lost.
When changing QoS trust configuration may be lost (see trust mode configuration for each QoS mode).
When disabling QoS, the shaper and queue settings (WRR/SP bandwidth setting and drop profile queue setting) are reset to default values.

All other user configurations remain intact.