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CoS Interface Configuration
Use the CoS Interface Configuration screen to configure the trust mode for one or more
interfaces and to apply an interface shaping rate to all interfaces or to a specific interface.
To configure CoS settings for an interface:
1.
Select QoS > CoS > Advanced > CoS Interface Configuration.
2.
Select the interfaces to configure.
For information about how to select and configure one or more ports and LAGs, see
Configuring Interface Settings
3.
From the Interface Trust Mode drop down list, select the trust mode for ingress traffic on the
selected interfaces.
•
Untrusted. Do not trust any CoS packet marking at ingress.
•
802.1p. The eight priority tags that are specified in IEEE 802.1p are p0 to p7. The
QoS setting lets you map each of the eight priority levels to one of seven internal
hardware priority queues.
•
DSCP. The six most significant bits of the DiffServ field are called the Differentiated
Services Code Point (DSCP) bits.
4.
In the Interface Shaping Rate field, specify the maximum bandwidth allowed.
This is typically used to shape the outbound transmission rate. This value is controlled
independently of any per-queue maximum bandwidth configuration. It is effectively a
second-level shaping mechanism. The default value is 0. The valid range is 0 to 100 in
increments of 1. The value 0 means the maximum is unlimited.
The expected shaping at egress interface is calculated as:
frameSize*shaping/(frameSize+IFG), where IFG (Inter frame gap) is 20 bytes, frameSize
is configured frame size of the traffic and shaping is configured traffic shaping in the
Interface Shaping Rate field.
Setting the value to 0 resets the configured traffic-shape rate.
5.
Click the Apply button to send the updated configuration to the switch. Configuration
changes take effect immediately.
6.
Click Cancel to cancel the configuration on the screen and reset the data on the screen to
the latest value of the switch.
S3300 Smart Managed Pro Switch
on page 32.
Configuring Quality of Service
226
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