A New Internet-Draft is available from the on-line Internet-Drafts directories.
Title : Implicit Signaling over Stateless Networks
Author(s) : V. Mancuso, et al.
Filename : draft-mancuso-nsis-impl-sign-00.txt
Pages : 28
Date : 2004-7-21
This memo defines a mechanism for NSIS Signaling Layer Protocol
(NSLP). The driving motivation is that some network domains, e.g.
based on Differentiated Services data plane, might not explicit
support a per-router and/or per-domain admission control rule.
Hence, for such domains, explicit signaling is not a viable
approach. To partially solve this issue, we suggest an admission
control paradigm devised to provide ?Implicit Signaling? via data
plane packet delivery operation. Implicit Signaling relies the
decision to admit a new flow upon the successful and timely
delivery, through the domain, of Probe packets independently
generated by the NSIS initiator (NI). The key idea is to use failed
receptions of Probes to discover, at the NI, that a congestion
condition occurs in the network segment between NSIS initiator and
NSIS Responder (NR), and to abort a reservation procedure. Since
Implicit Signaling is not able to communicate per-flow traffic and
QoS parameters, in principle it cannot exert a QoS control as tight
as in the case of explicit mechanisms. However, it is important to
notice that Implicit Signaling can indeed operate in a
differentiated manner on the basis of traffic and QOS parameters, if
i) Probes are marked according to the flow traffic and QoS
requirements, ii) marked Probes experience a dropping behaviour
according to their mark, and iii) Probe dropping is controlled
according to measurements taken into the core routers.
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