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IETF PCN by Mind Map: IETF PCN
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IETF PCN

General architecture for flow admission and termination based on (pre-) congestion information in order to protect the quality of service of flows within a DiffServ domain [RFC2475]

Functions

Flow Admission Control

Flow Termination

PCN information generation

PCN information termination

Interior Node

Packet Classify

PCN-meter (not per-flow)

PCN-mark

Ingress Node

Packet Classify

Police (per-flow)

PCN-colour

PCN-meter

Egress Node

Packet Classify

PCN-meter

PCN-colour

Information

Per-Link

PCN lower-rate

PCN upper-rate

Edge ingress-nodes

per-flow state

Concepts

Marking

Applied to the overall PCN-traffic on a per-link basis i.e. not per-flow

In-band signaling

marking in the ECN field

Resilient

QoS is decoupled from the routing system

Termination

Adaptable

Flows are dynamically managed

Inelastic traffic

PCN flows have known peak rate

Measurement

Sufficient high number of PCN traffic across a link so that statistical mechanisms can be effective

Admission

Decision performed between pairs of PCN edge nodes (i.e. ingress and egress for a given flow)

Tunneling

Probing

Single-Domain

ISSUES

communication to the application layer of the admission control decision

"importance" semantic

ECMP