The increasing number of delay and loss critical
services in packet networks require differentiated packet
handling in the forwarding plane. Quality of Service (QoS)
guarantees can be given for networks using resource reservation
and admission control. However, such strategies require complex
control plane extensions and might lead to higher operation
expenditures.
Network operators therefore often use over-provisioning and
traffic differentiation to offer cheaper class of service quality in
their internet protocol (IP) packet networks.
Priority marking and forwarding of packetized data traffic
can be realized mainly using different layer two and three
mechanisms. The number of differentiated classes and their
autonomous system (AS) internal implementation is at the
operator’s choice.
This paper proposes a concept of cross-domain and cross-layer
priority signaling between packet switched networks to be used
at the inter-AS peering points. It makes use of the Border
Gateway Protocol (BGP) as the predominantly used routing
protocol for AS peering communication. A new BGP-4 path
attribute is used to convey the structured priority information.
The new concept ensures that all receiving AS peers are
consistently and comprehensively informed about the QoS
handling within the IP prefix originating AS. Based on this
information, all ASes can perform close QoS treatment
approximation in a cross-domain and cross-layer manner.
The approach is now work in progress at the IETF.
| Identifer | oai:union.ndltd.org:DRESDEN/oai:qucosa.de:bsz:ch1-200900238 |
| Date | 04 February 2009 |
| Creators | Knoll, Thomas Martin |
| Contributors | TU Chemnitz, Fakultät für Elektrotechnik und Informationstechnik |
| Publisher | Universitätsbibliothek Chemnitz |
| Source Sets | Hochschulschriftenserver (HSSS) der SLUB Dresden |
| Language | English |
| Detected Language | English |
| Type | doc-type:conferenceObject |
| Format | application/pdf, text/plain, application/zip |
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