Class Of Service; Basic - NETGEAR GSM7212P User Manual

Class of Service

The Class of Service (CoS) queueing feature lets you directly configure certain aspects of
switch queueing. This provides the desired QoS behavior for different types of network traffic
when the complexities of DiffServ are not required. The priority of a packet arriving at an
interface can be used to steer the packet to the appropriate outbound CoS queue through a
mapping table. CoS queue characteristics that affect queue mapping, such as minimum
guaranteed bandwidth, or transmission rate shaping are user-configurable at the queue (or
port) level.
Eight queues per port are supported.
From the Class of Service link under the QoS tab, you can access the following pages:
on page 197
•

Basic

on page 199
• Advanced
Basic
From the Basic link, you can access the following pages:
• CoS Configuration
CoS Configuration
To display the CoS Configuration page, click QoS
Use the CoS Configuration page to set the class of service trust mode of an interface. Each
port in the switch can be configured to trust one of the packet fields (802.1p or IP DSCP), or
to not trust any packet's priority designation (untrusted mode). If the port is set to a trusted
mode, it uses a mapping table appropriate for the trusted field being used. This mapping
table indicates the CoS queue to which the packet should be forwarded on the appropriate
egress port(s). Of course, the trusted field must exist in the packet for the mapping table to be
of any use, so there are default actions performed when this is not the case. These actions
involve directing the packet to a specific CoS level configured for the ingress port as a whole,
based on the existing port default priority as mapped to a traffic class by the current 802.1p
mapping table.
Alternatively, when a port is configured as untrusted, it does not trust any incoming packet
priority designation and uses the port default priority value instead. All packets arriving at the
Web Management User Guide
on page 197
197
  
CoS Basic CoS Configuration.