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DES-3010F/G / DES-3018 / DES-3026 Fast Ethernet Switch Manual

Section 8

QoS

Port Bandwidth

802.1p Default Priority

802.1p User Priority

QoS Scheduling Mechanism

QoS Output Scheduling

QoS

The Switch supports 802.1p priority queuing Quality of Service. The following section discusses the implementation of

QoS (Quality of Service) and benefits of using 802.1p priority queuing.

Understanding IEEE 802.1p Priority

Priority tagging is a function defined by the IEEE 802.1p standard designed to provide a means of managing traffic on a

network where many different types of data may be transmitted simultaneously. It is intended to alleviate problems

associated with the delivery of time critical data over congested networks. The quality of applications that are dependent on

such time critical data, such as video conferencing, can be severely and adversely affected by even very small delays in

transmission.

Network devices that are in compliance with the IEEE 802.1p standard have the ability to recognize the priority level of

data packets. These devices can also assign a priority label or tag to packets. Compliant devices can also strip priority tags

from packets. This priority tag determines the packet's degree of expeditiousness and determines the queue to which it will

be assigned.

Priority tags are given values from 0 to 7 with 0 being assigned to the lowest priority data and 7 assigned to the highest.

The highest priority tag 7 is generally only used for data associated with video or audio applications, which are sensitive to

even slight delays, or for data from specified end users whose data transmissions warrant special consideration.

The Switch allows you to further tailor how priority tagged data packets are handled on your network. Using queues to

manage priority tagged data allows you to specify its relative priority to suit the needs of your network. There may be

circumstances where it would be advantageous to group two or more differently tagged packets into the same queue.

Generally, however, it is recommended that the highest priority queue, Queue 3, be reserved for data packets with a

priority value of 7. Packets that have not been given any priority value are placed in Queue 0 and thus given the lowest

priority for delivery.

A weighted round robin system is employed on the Switch to determine the rate at which the queues are emptied of

packets. The ratio used for clearing the queues is 4:1. This means that the highest priority queue, Queue 3, will clear 4

packets for every 1 packet cleared from Queue 0.

Remember, the priority queue settings on the Switch are for all ports, and all devices connected to the Switch will be

affected. This priority queuing system will be especially beneficial if your network employs switches with the capability of

assigning priority tags.

The Advantages of QoS

QoS is an implementation of the IEEE 802.1p standard that allows network administrators a method of reserving

bandwidth for important functions that require a large bandwidth or have a high priority, such as VoIP (voice-over Internet

Protocol), web browsing applications, file server applications or video conferencing. Not only can a larger bandwidth be

created, but other less critical traffic can be limited, so excessive bandwidth can be saved. The Switch has separate

hardware queues on every physical port to which packets from various applications can be mapped to, and, in turn

prioritized. View the following map to see how the Switch implements basic 802.1P priority queuing.

1 2 ... 78 79 80 81 82 83 84 85 86 87 88 ... 185 186

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