traffic engineering methods

(redirected from CBQ)
Also found in: Acronyms, Wikipedia.

traffic engineering methods

There are a variety of traffic engineering methods that are used to regulate network traffic. Mostly dealing with queuing, they ensure that transmitted data are received in a timely manner. Following are the common methods. See traffic engineering, traffic shaping and traffic policing.

First-In, First-Out (FIFO) Queuing
First-Come, First-Served (FCFS) Queuing
The simplest queuing method. Packets are placed into a single queue and serviced in the order they were received.

Priority Queuing (PQ)
Each packet is assigned a priority and placed into a hierarchy of queues based on priority. When there are no more packets in the highest queue, the next-lower queue is serviced. The problem with this method is that lower-priority packets may get little attention.

Fair Queuing (FQ)
Each packet is assigned a type (flow) and placed into the queue for that type. All queues are serviced round-robin: a packet from one queue, a packet from the next and so on. FQ provides a more uniform service to all packet types than priority queuing (PQ).

Weighted Fair Queuing (WFQ)
Similar to fair queuing (FQ), except that queues are given priorities and can support variable-length packets.

Hierarchical Weighted Fair Queuing (HWFQ)
Similar to WFQ, but monitors traffic and evaluates current conditions to adjust queues. Uses worst-case packet delay as its evaluation metric.

Weighted Round Robin (WRR)
Class-Based Queuing (CBQ)
Custom Queuing (CQ)
Similar to fair queuing, packets are assigned a class (real time, file transfer, etc.) and placed into the queue for that class of service. Packets are accessed round-robin style, but classes can be given priorities. For example, four packets from a high-priority class might be serviced, followed by two from a middle-priority class and then one from a low-priority class.

Deficit Weighted Round Robin (DWRR)
A weighted round-robin (WRR) method that uses a deficit counter. A maximum packet size number is subtracted from the packet length, and packets that exceed that number are held back until the next visit of the scheduler.

TCP Rate Shaping (TRS)
This non-queuing method dynamically adjusts the TCP window size based on real-time evaluation of the traffic flows.
Copyright © 1981-2019 by The Computer Language Company Inc. All Rights reserved. THIS DEFINITION IS FOR PERSONAL USE ONLY. All other reproduction is strictly prohibited without permission from the publisher.
References in periodicals archive ?
"The bank recently announced that it has initiated the formal squeeze out process of its subsidiary in Turkey, Abank; CBQ will own an additional 0.75 per cent, bringing its total stake to 75 per cent (25 per cent is held by CBQ's Turkish partners), which will result in the delisting of Abank from Bourse Istanbul.
While earnings growth and ROAs remain healthy, strong RWA growth will consume considerable capital at CBQ and Doha Bank.
KFH and Burgan bank have sizeable lending exposure with 30 per cent and 25 per cent of total group loans respectively to Turkish subsidiaries, while the Qatari lenders such as QNB and CBQ have 13 per cent and 15 per cent of loans to Turkey.
The VRs are 'bbb+' for QNB, 'bbb-' for CBQ, DB, QIB and ABQ, with the remaining four banks at 'bb+'.
The responsibility of the exclusive cash management mandate for Northwestern University in Qatar (NU-Q) has been given to Commercial Bank's (CBQ) Transaction Banking Department.
Qatar's Commercial Bank (CBQ) is in talks to sell its 40 per cent stake in Sharjah-based United Arab Bank (UAB).
Manama: 01 Systems, a Bahrain-based regional leader in banking software solutions, has announced that Commercial Bank of Qatar (CBQ), is the first bank in that country and the Middle East to introduce its biometric solution that enables card-less transactions on ATMs.
ICBC had previously bid to purchase another, smaller bank in Turkey, Alternatifbank, of which 71 percent was later sold to the Commercial Bank of Qatar (CBQ) for $460 million.
Commercial Bank of Qatar (CBQ) suffered a three per cent decline in second-quarter net profit, Reuters calculations based on half-year figures from the bank showed on Wednesday, as higher costs and provisions overshadowed strong loan growth.
Meanwhile, CBQ is studying a number of initiatives, including retaining earnings, to boost its capital base in the next 18 months, its group chief executive told Reuters.