Name: draft-mancuso-nsis-impl-sign-00
Title: Implicit Signaling over Stateless Networks
State: Active
Authors: Vincenzo Mancuso
Group: Individual Submissions (none)
Date: 2004-07-21
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.
[sh-index] Back to list of manuals
|
| |
