Sonic Impact Technologies NSA 2400MX Manual De Usuario

In SonicOS, four queues with different priority levels (low, normal, high, highest) are supported. These are 
mapped to the eight levels defined in IEEE 802.1p (CoS) and cannot be changed. 

 shows the 

mapping between the CoS priority levels and the four supported queue priority levels.

On the Switching > Layer 2 QoS page, you can configure the mapping between each value in the DSCP 
range of 0-63 and the four queues (Low, Normal, High, Highest) supported for Layer 2 QoS, or reset the 
entire map to the default settings (Normal queue for all DSCP values). Also, on the Firewall > QoS Mapping 
page, you can configure the mapping between the DSCP range and the 8 levels defined by CoS. 

Frames received on ports configured to trust CoS or DSCP are queued appropriately according to the 
mapping table. An option is provided to select the field to use when both the 802.1p tag field and the DSCP 
field are present in ingressing frames.

For QoS settings, ports can be assigned a default priority. The default priority is used when Trust CoS or 
Trust DSCP is enabled, but the information is absent. When Fixed Priority is enabled, the 802.1p tag field 
and DSCP field are ignored and the default priority is used.

See the following procedures:

To configure Weighted Round-Robin or Strict Priority Queue as the output scheduling mechanism, perform 
the following steps:

On the Switching > Layer 2 QoS page, select one of the following from the Output Scheduling 
Mechanism drop-down list:

Weighted Round-Robin – When Weighted Round-Robin is selected, the weighting factors are 8:4:2:1.

0

Best Effort

Normal

1

Background

Low

2

Spare

Low

3

Excellent Effort (Business 
critical)

Normal

4

Controlled Load (Streaming 
multimedia)

High

5

Video (Interactive Media) 
[Less than 100ms latency 
and jitter]

High

6

Voice [Less than 10ms 
latency and jitter]

Highest

7

Network Control [Lowest 
latency and jitter]

Highest