Netgear GS724TS-100NAS User Manual download pdf (Page 128)

128 | Chapter 4: Configuring Quality of Service

GS716Tv2 and GS724Tv3 Software Administration 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.

Four queues per port are supported.

From the Class of Service link under the QoS tab, you can access the following pages:

• Basic CoS Configuration on page 128

• CoS Interface Configuration on page 129

• Interface Queue Configuration on page 131

• 802.1p to Queue Mapping on page 132

• DSCP to Queue Mapping on page 133

Basic CoS Configuration

Use the Trust Mode 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

ingress of an untrusted port are directed to a specific CoS queue on the appropriate egress

port(s), in accordance with the configured default priority of the ingress port. This process is

also used for cases where a trusted port mapping is unable to be honored, such as when a

non-IP packet arrives at a port configured to trust the IP DSCP value.

To display the Basic CoS Configuration page, click QoS  Basic  CoS Configuration.

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Netgear GS724TS-100NAS User Manual Page 128