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Table 32 Configuration: Switch Configuration: Priority Queue

LABELS DESCRIPTION

Priority Queue

Assignment

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

MAC-layer 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. The switch has 8 physical queues that you can map to the 8

priority levels. 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. See also

Section 13.7 on page 131 for related information.

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.

NetAtlas Enterprise 1.00 User’s Guide

Chapter 11 Switch Configuration 102

The following table describes the labels in this screen.

11.4 STP Configuration

This section discribes STP and how to configure STP.

11.5 STP Overview

The switch supports STP. STP detects and breaks network loops and provides backup links

between switches, bridges or routers. It allows a device to interact with other STP-aware

devices in your network to ensure that only one path exists between any two stations on the

network.

Refer to the user’s guide that comes with your switch for more information.

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