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| Bandwidth management mechanisms and techniques | |
| 2>
Bandwidth management mechanisms may be used to further engineer performance and includes:
Traffic shaping (rate limiting):
Token bucket
Leaky bucket
TCP rate control - artificially adjusting TCP window size as well as controlling the rate of ACKs being returned to the sender[citation needed]
Scheduling algorithms:
Weighted fair queuing (WFQ)
Class based weighted fair queuing
Weighted round robin (WRR)
Deficit weighted round robin (DWRR)
Hierarchical Fair Service Curve (HFSC)
Congestion avoidance:
RED, WRED - Lessens the possibility of port queue buffer tail-drops and this lowers the likelihood of TCP global synchronization
Policing (marking/dropping the packet in excess of the committed traffic rate and burst size)
Explicit congestion notification
Buffer tuning
Bandwidth reservation protocols / algorithms
Resource reservation protocol (RSVP)
Constraint-based Routing Label Distribution Protocol (CR-LDP)
Top-nodes algorithm
Traffic classification - categorising traffic according to some policy in order that the above techniques can be applied differently to each class of traffic
[edit] Tags:Traffic Shaping,Rate Limiting,Token Bucket,Leaky Bucket,Scheduling Algorithms,Weighted Fair Queuing,Class Based Weighted Fair Queuing,Weighted Round Robin,Deficit Weighted Round Robin,Hierarchical Fair Service Curve,Red,Wred,Port Queue Buffer,Tail-drops,Tcp Global Synchronization,Explicit Congestion Notification,Resource Reservation Protocol,Constraint-based Routing Label Distribution Protocol,Top-nodes Algorithm,Traffic Classification,Tcp, | |
| Link performance | |
| 2>
Issues which may limit the performance of a given link include:
TCP determines the capacity of a connection by flooding it until packets start being dropped (Slow-start)
Queueing in routers results in higher latency and jitter as the network approaches (and occasionally exceeds) capacity
TCP global synchronization when the network reaches capacity results in waste of bandwidth
Burstiness of web traffic requires spare bandwidth to rapidly accommodate the bursty traffic
Lack of widespread support for explicit congestion notification and Quality of Service management on the Internet
Internet Service Providers typically retain control over queue management and quality of service at their end of the link
Window Shaping allows higher end products to reduce traffic flows, which reduce queue depth and allow more users to share more bandwidth fairly
[edit] Tags:Slow-start,Latency,Jitter,Burstiness,Quality Of Service,Internet Service Providers, | |
| See also | |
| 2>
INASP runs bandwidth management training workshops and produces reports
Bandwidth management using NetFlow and IPFIX data
Network congestion avoidance lists some techniques for prevention and management of congestion on routers
Traffic shaping and Rate limiting are bandwidth management (traffic control) techniques
Bandwidth management is a subset of Network management and Performance management
Network traffic measurement is a subset of Network monitoring
Bandwidth throttling
Bandwidth cap
[edit] Tags:Network Congestion,Network Traffic Measurement,Inasp,Netflow,Network Congestion Avoidance,Network Management,Performance Management, | |
| References | |
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"Deploying IP and MPLS QoS for Multiservice Networks: Theory and Practice" by John Evans, Clarence Filsfils (Morgan Kaufmann, 2007, ISBN 0-12-370549-5)
[edit] Tags: | |
| External links | |
| 2>
Bandwidth Management Tools, Strategies, and Issues
TechSoup for Libraries: Bandwidth Management
The True Price of Bandwidth Monitoring
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