Chapter 14 Switch Configuration

Figure 101 Switch Configuration: Priority Queue

The following table describes the labels in this screen.

Table 65 Switch Configuration: Priority Queue

LABELS

DESCRIPTION

Priority Queue

IEEE 802.1p defines up to 8 separate traffic types by inserting a tag into a MAC-layer

Assignment

frame that contains bits to define class of service. Frames without an explicit priority

 

tag are given the default priority of the ingress port. Use these fields to configure the

 

priority level-to-physical queue mapping. On the switch, traffic assigned to higher

 

index queues gets through faster while traffic in lower index queues is dropped if the

 

network is congested.

 

 

Priority Level

The following descriptions are based on the traffic types defined in the IEEE 802.1D

 

standard (which incorporates 802.1p). Select a level from the drop-down list box(es).

 

 

Level 7

Typically used for network control traffic such as router configuration messages.

 

 

Level 6

Typically used for voice traffic that is especially sensitive to jitter (jitter is the variations

 

in delay).

 

 

Level 5

Typically used for video that consumes high bandwidth and is sensitive to jitter.

 

 

Level 4

Typically used for controlled load, latency-sensitive traffic such as SNA (Systems

 

Network Architecture) transactions.

 

 

Level 3

Typically used for “excellent effort” or better than best effort and would include

 

important business traffic that can tolerate some delay.

 

 

Level 2

This is for “spare bandwidth”.

 

 

Level 1

This is typically used for non-critical “background” traffic such as bulk transfers that

 

are allowed but that should not affect other applications and users.

 

 

Level 0

Typically used for best-effort traffic.

 

 

Apply

Click Apply to save your changes back to the switch.

 

 

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NetAtlas Workgroup User’s Guide