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Topic: Differentiated services


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  RFC 2474 (rfc2474) - Definition of the Differentiated Services Field (DS F   (Site not responding. Last check: 2007-11-07)
A differentiated services boundary typically is found at the ingress to the first-hop differentiated services-compliant router (or network node) that a host's packets traverse, or at the egress of the last-hop differentiated services-compliant router or network node that packets traverse before arriving at a host.
Differentiated Services Field Definition A replacement header field, called the DS field, is defined, which is intended to supersede the existing definitions of the IPv4 TOS octet [RFC791] and the IPv6 Traffic Class octet [IPv6].
Service providers are not required to use the same node mechanisms or configurations to enable service differentiation within their networks, and are free to configure the node parameters in whatever way that is appropriate for their service offerings and traffic engineering objectives.
www.faqs.org /rfcs/rfc2474.html   (5819 words)

  
 rfc2475 - An Architecture for Differentiated Services
Informational [Page 2] RFC 2475 Architecture for Differentiated Services December 1998 characteristics may be specified in quantitative or statistical terms of throughput, delay, jitter, and/or loss, or may otherwise be specified in terms of some relative priority of access to network resources.
Service provisioning and traffic conditioning policies are sufficiently decoupled from the forwarding behaviors within the network interior to permit implementation of a wide variety of service behaviors, with room for future expansion.
Differentiated Services Architectural Model The differentiated services architecture is based on a simple model where traffic entering a network is classified and possibly conditioned at the boundaries of the network, and assigned to different behavior aggregates.
aurora.rg.iupui.edu /doc/rfc/rfc-html/rfc2475.html   (11148 words)

  
 Voice over IP - Wikipedia, the free encyclopedia
At the other extreme are services like Gizmo Project and Skype which rely on a software client on the computer in order to place a call over the network, where one user ID can be used on many different computers or in different locations on a laptop.
Additionally, a call to the U.S. emergency services number 911 may not automatically be routed to the nearest local emergency dispatch center, and would be of no use for subscribers outside the U.S. This is particularly true for users who select a number with an area code outside their area.
VoIP services that function over managed networks are often considered to be a viable substitute for PSTN telephone services (despite the problems of power outages and lack of geographical information); as a result, major operators that provide these services (in practice, incumbent operators) may find themselves bound by obligations of price control or accounting separation.
en.wikipedia.org /wiki/Voice_over_IP   (4250 words)

  
 An Architecture for Differentiated Services
Differentiated services mechanisms can be utilized to aggregate Integrated Services/RSVP state in the core of the network [4].
The differentiated services architecture is based on a simple model where traffic entering a network is classified and possibly conditioned at the boundaries of the network, and assigned to different behavior aggregates.
Differentiated services are extended across a DS domain boundary by establishing a SLA between an upstream network and a downstream DS domain.
xml.resource.org /public/rfc/html/rfc2475.html   (10658 words)

  
 Differentiated Services (Diff-Serv) (Linktionary term)
The primary Diff-Serv RFCs are RFC 2474 (Definition of the Differentiated Services Field in the IPv4 and IPv6 Headers, December 1998), which defines the DS field and how it is used, and RFC 2475 (An Architecture for Differentiated Services, December 1998), which describes techniques for implementing scalable differentiated services on the Internet.
Service characteristics may be designed to improve throughput or reduce delay, jitter, and packet loss.
Differentiated services can accommodate different types of application requirements and allow service providers to price services according to their characteristics.
www.linktionary.com /d/diffserv.html   (2709 words)

  
 Differentiated Services for Internet2
Differentiated Services grew out desire to find an approach that would be simple, scalable, and relatively easy to deploy in a predominantly best-efforts internet.
A brief overview of the differentiated services framework is given in Section 2 and the family of differentiated services approaches that are of interest to Internet2 is identified.
The differentiated services approach is particularly well-suited to meeting the administrative challenges of extending a QoS service across separately administrative clouds.
qos.internet2.edu /may98Workshop/html/diffserv.html   (4490 words)

  
 What is Differentiated Services? - a definition from Whatis.com - see also: DS, DiffServ   (Site not responding. Last check: 2007-11-07)
Differentiated Services (DiffServ, or DS) is a protocol for specifying and controlling network traffic by class so that certain types of traffic get precedence - for example, voice traffic, which requires a relatively uninterrupted flow of data, might get precedence over other kinds of traffic.
Differentiated Services is the most advanced method for managing traffic in terms of what is called Class of Service (CoS).
Differentiated Services and the Class of Service approach provide a way to control traffic that is both more flexible and more scalability than the Quality of Service approach.
whatis.techtarget.com /definition/0,,sid9_gci213845,00.html   (294 words)

  
 RFC 3747 (rfc3747) - The Differentiated Services Configuration MIB
The Differentiated Services MIB Module The Differentiated Services MIB module [RFC3289] provides a common set of managed objects useful for configuring Differentiated Services parameters on a Differentiated Services capable device.
Since the managed objects of the Differentiated Services MIB [RFC3289] are not directly associated with an instance (interface and interface direction), the same managed objects can be used for traffic treatment configuration templates in a Differentiated Services capable device and can then be applied on multiple instances.
This MIB allows policies to use 'templates' to instantiate Differentiated Services functional datapath configurations to be assigned (associated with an interface and direction) when a policy is activated.
www.faqs.org /rfcs/rfc3747.html   (3996 words)

  
 RFC 3747 - The Differentiated Services Configuration MIB   (Site not responding. Last check: 2007-11-07)
Hazewinkel and Partain Standards Track [Page 7] RFC 3747 Differentiated Services Configuration MIB April 2004 NOTE WELL: For brevity and clarity, the example does not always show the complete entry (row) of a table.
The Hazewinkel and Partain Standards Track [Page 9] RFC 3747 Differentiated Services Configuration MIB April 2004 configuration is represented as follows in the DIFFSERV-CONFIG-MIB module and the DIFFSERV-MIB module.
Hazewinkel and Partain Standards Track [Page 14] RFC 3747 Differentiated Services Configuration MIB April 2004 In order to apply the template to all interfaces that have a role match of "Administrator," the SNMP manager must have a list of the roles of the interface.
www.packetizer.com /rfc/rfc.cgi?num=3747   (4086 words)

  
 Cisco - The Differentiated Services Model (DiffServ)
Cisco's solution leverages the new IETF definition of the IPv4 Type of Service (ToS) octet in the IP packet-header by utilizing the Differentiated Services Code Point (DSCP) field to classify packets into any of the 64 possible classes.
Service providers want to provide value-added services to their customers by providing blanket Service Level Agreements (SLAs), as well as application-specific assurances (aSLAs).
At the edge of the network, this component is logically responsible for classifying, marking, metering, and shaping or policing the packets entering the network.
www.cisco.com /warp/public/cc/pd/iosw/prodlit/difsf_ds.htm   (942 words)

  
 Differentiated Services
Differentiated Services provides a scalable means of service differentiation in the internet.
The Differentiated Services (commonly referred to as diff-serv) architecture offers a framework within which service providers can offer each customer a range of network services which are differentiated on the basis of performance in addition to pricing tiers used in the past.
The resource allocation for each service type adds a new dimension to the problem, for which the Bandwidth Brokers are being considered.
qos.ittc.ku.edu /DiffSpec/node5.html   (354 words)

  
 [No title]
An example of a service marking model is IPv4 TOS as defined in [RFC1349].
The TOS markings defined in [RFC1349] are very generic and do not span the range of possible service semantics.
Note that it is important to restrict the codepoints in use to the Class Selector Codepoints, since the legacy node may or may not interpret bits 3-5 in accordance with [RFC1349], thereby resulting in unpredictable forwarding results.
www.ietf.org /rfc/rfc2475.txt   (11145 words)

  
 DiffServ (differentiated services)
The DiffServ model for QoS was developed to differentiate IP traffic so that the traffic's relative priority could be determined on a per-hop basis.
This approach allows traffic with similar service characteristics to be passed with similar traffic guarantees across multiple networks, even if the multiple networks don't provide the same service the same way.
This technique allows service providers to control how the DSCP codepoints are mapped to PHBs, and each time a packet enters a network domain it may be re-marked.
www.networkworld.com /details/660.html   (745 words)

  
 Differentiated Services on Linux
Differentiated Services (short: Diffserv) is an architecture for providing different types or levels of service for network traffic.
One key characteristic of Diffserv is that flows are aggregated in the network, so that core routers only need to distinguish a comparably small number of aggregated flows, even if those flows contain thousands or millions of individual flows.
Support for Differentiated Services on Linux is part of the more general Traffic Control architecture.
diffserv.sourceforge.net   (482 words)

  
 Amazon.com: Differentiated Services for the Internet: Books: Kalevi Kilkki   (Site not responding. Last check: 2007-11-07)
Differentiated Services is an Internet Engineering Task Force (IETF) standards effort to create a simple scheme which provides a range of quality of service (QoS) levels.
It is one of the few technologies to date that will enable networks to handle traffic in a specific manner to meet the service demands of particular applications.
It covers stuff ranging from the origin of QoS, how the IETF started with Integrated services and the reason for ths shift towards differentiated services.
www.amazon.com /exec/obidos/tg/detail/-/1578701325?v=glance   (828 words)

  
 Differentiated Services on Linux - Almesberger, Salim, Kuznetsov, Knuth (ResearchIndex)   (Site not responding. Last check: 2007-11-07)
We have designed support for Differentiated Services based on the existing traffic control elements, and we have implemented new components where necessary.
1 Introduction The Differentiated Services architecture (Diffserv) lays the...
241 Definition of the Differentiated Services Field (context) - Nichols, Blake et al.
citeseer.ist.psu.edu /258432.html   (550 words)

  
 RTCL - Differentiated Services   (Site not responding. Last check: 2007-11-07)
While this was a satisfactory service type for a long time of the Internet life, nowadays many new applications are working on the Internet with new service requirements and more strict characteristics and these applications used to employ variant and sometimes nonstandard techniques to provide the amount of guarantees required for acceptable performance.
Briefly, DiffServ is built upon a simple model of traffic conditioning and policing at the edges of the network in addition to classification to different service classes, then the traffic is forwarded using simple differentiated treatments (called per-hop behaviors or PHBs) in the core of the network.
This differentiated services treatments employ differentiated pricing also for the different classes which provides a good reasoning for adoption of this idea by major network providers and ISPs.
kabru.eecs.umich.edu /qos_network/diffserv/DiffServ.html   (595 words)

  
 SWITCH - Projects - TF-NGN
There is a wealth of papers about different aspects of the differentiated services architecture, and this list cannot even attempt to be comprehensive.
Differentiated Services working group has been chartered by the IESG.
RFC 2474: Definition of the Differentiated Services Field (DS Field) in the IPv4 and IPv6 Headers
www.switch.ch /tf-tant/diffserv/references.html   (946 words)

  
 Differentiated Services on Linux
This page contains links to resources related to support for Differentiated Services on Linux.
There is a mailing list for discussion concerning the development and use of support for Differentiated Services on Linux.
"Differentiated Services on Linux", March 1999 (preliminary version of draft-almesberger-wajhak-diffserv-linux-01.txt)
icawww1.epfl.ch /linux-diffserv/old.html   (227 words)

  
 Differentiated Services: A New (ResearchIndex)   (Site not responding. Last check: 2007-11-07)
If your firewall is blocking outgoing connections to port 3125, you can use these links to download local copies.
Abstract: With the grown popularity of the Internet and the increasing use of business and multimedia applications the users' demand for higher and more predictable quality of service has risen.
A first improvement to offer better than best-effort services was made by the development of the integrated services architecture and the RSVP protocol.
citeseer.ist.psu.edu /711469.html   (198 words)

  
 DiffServ references list   (Site not responding. Last check: 2007-11-07)
[II-11] K. Nichols, B. Carpenter, "Definition of Differentiated Services Behavior Aggregates and Rules for their Specification," Internet Draft, draft-ietf-diffserv-ba-def-01.txt, Feb. 2000.
[VII-63] P. Pieda, N. Seddigh, B. Nandy, "The Dynamics of TCP and UDP Interaction in IP-QoS Differentiated Services Networks," The 3rd Canadian Conference on Broadband Research, November 1999.
[VII-65] R. Gibbens et al., "An Approach to Service Level Agreements for IP Networks with Differentiated Services," http://www.statslab.cam.ac.uk/~richard/research/papers/sla/, January 2000.
kabru.eecs.umich.edu /qos_network/diffserv/DiffServ_Ref.html   (2928 words)

  
 Differentiated Services   (Site not responding. Last check: 2007-11-07)
I am currently studying the Quality of Service issues over the Internet.
Some of the interesting links on this subject that I have run into are
Current state of IP Differentiated Services - Kathleen Nichols
www.cs.unh.edu /~sowmyam/research.html   (43 words)

  
 Universität Bern - IAM - RVS - Publications
Quality of Service in Mobile and Wireless Networks as a minitrack of Hicss conference (HICSS), Big Island, Hawaii, January 3-6, 2005.
1st International Workshop on Services and Applications in the Wireless Public Infrastructure, Evry (Paris), France, July 25-27, 2001
Proceedings of Multimedia Applications, Services and Techniques ECMAST'99, LNCS 1629, p.281-296, May 1999, ISBN 3-540-66082-8.
www.iam.unibe.ch /~rvs/research/pub.html   (2391 words)

  
 TF-TANT: diffserv testing
Delay and Delay Variation Measurements in a Differentiated Services Test Network;
Virtual Leased Line (VLL) and one-to-many VLL (1-nVLL) service
Test of CISCO's IP QoS Implementation considering Differentiated Services, R. Stoy, J.Jaehnert (word)
www.cnaf.infn.it /~ferrari/tfng/ds   (304 words)

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