A New Internet-Draft is available from the on-line Internet-Drafts directories.
Title : Per Hop Behaviors Based on Dynamic Packet State
Author(s) : I. Stoica, H. Zhang, F. Venkitaraman, N. Mysore
Filename : draft-stoica-diffserv-dps-02.txt
Pages : 16
Date : 2002-10-9
This document proposes a family of Per-Hop Behaviors (PHBs)
based on Dynamic Packet State (DPS) in the context of the
differentiated service architecture. With these PHBs, distributed
algorithms can be devised to implement services with flexibility,
utilization, and assurance levels similar to those that can be
provided with per-flow mechanisms.
With Dynamic Packet State, each packet carries in its header, in
addition to the PHB codepoint, some PHB-specific state. The state
is initialized by the ingress node. Interior nodes process each
incoming packet based on the state carried in the packet's
header, updating both its internal state and the state in the
packet's header before forwarding it to the next hop. By using
DPS to coordinate actions of edge and interior nodes along the
path traversed by a flow, distributed algorithms can be designed
to approximate the behavior of a broad class of 'stateful'
networks using networks in which interior nodes do not maintain
per-flow state. We give examples of services that can be implemented by
PHBs based on DPS. We also discuss several possible solutions for
encoding Dynamic Packet State that have the minimum incompatibility with IPv4.
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