Netgear GS728TP User Manual download pdf (Page 332)

100

101

Configuring Quality of Service

332

ProSafe M5300 Switch

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

• Basic on page 332

• Advanced on page 333

Basic

From the Basic link, you can access the following pages:

• CoS Configuration on page 332

CoS Configuration

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

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

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 configure global CoS settings:

1. Use Global to specify all CoS configurable interfaces. The option “Global” represents

the most recent global configuration settings.

2. Use Interface to specify CoS configuration settings based per-interface.

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