Interface Queue Configuration - NETGEAR GS728TS Admin Manual

GS728TS, GS728TPS, GS752TS, and GS752TPS Gigabit Smart Switches
To configure CoS settings for an interface:
1. To configure CoS settings for a physical port, click the unit ID of the stack member with
the ports to configure.
2. To configure CoS settings for a Link Aggregation Group (LAG), click LAGS.
3. To configure CoS settings for both physical ports and LAGs, click ALL.
4. Select the check box next to the port or LAG to configure. You can select multiple ports and
LAGs to apply the same setting to the selected interfaces.
5. From the Interface Trust Mode field, specify whether or not the selected interface(s) trust a
particular packet marking when the packet enters the port.
• 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 four internal
hardware priority queues: High, Normal, Low, and Lowest.
• DSCP. The six most significant bits of the DiffServ field are called the Differentiated
Services Code Point (DSCP) bits.
6. From the Interface Shaping Rate field, specify the maximum bandwidth allowed on the
selected interface(s). This setting is typically used to shape the outbound transmission rate
in increments of 64 kbps. 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, in increments of 16. A value of 0 means the maximum is unlimited.
The expected shaping at egress interface is calculated as:
(frameSize × shaping × 64) ÷ (frameSize+IFG), where IFG (Inter frame gap) is 20 bytes,
frameSize is the configured frame size of the traffic, and shaping is the configured traffic
shaping in the Interface Shaping Rate field.
For example, when a 64 byte frame size and 64 kbps interface shaping rate are
configured, the expected shaping will be approximately 3121 kbps.
7. Click Cancel to cancel the configuration on the screen and reset the data on the screen to
the latest value of the switch.
8. If you make changes to the page, click Apply to apply the changes to the system.

Interface Queue Configuration

Use the Interface Queue Configuration page to define what a particular queue does by
configuring switch egress queues. User-configurable parameters control the amount of
bandwidth used by the queue, the queue depth during times of congestion, and the
scheduling of packet transmission from the set of all queues on a port. Each port has its own
CoS queue-related configuration.
The configuration process is simplified by allowing each CoS queue parameter to be
configured globally or per-port. A global configuration change is automatically applied to all
ports in the system.
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