This document proposes a new admission control paradigm, called GRIP (Gauge&Gate Reservation with Independent Probing), devised to transparently operate over DiffServ domains. GRIP relies the decision to admit a new flow upon the successful and timely delivery, through the Internet, of probe packets independently generated by the end points. The key idea is to use failed receptions of probes to discover, at the end points, that a congestion condition occurs in the network, and to reject the new admission request. This idea is extremely close to what TCP congestion control technique does, but it is used in the novel context of admission control. Similarly to TCP, GRIP is a pure end-to-end distributed protocol operation, whose intelligence is kept at the edge of the network and whose operation (i) does not require any specific protocol implementation in the core routers, which are stateless and remain oblivious to individual flows, and (ii) does not require any specific peer and router agreement on the probes payload information. GRIP is coherent with the architectural assumptions of RFCs [1,2] and attempts answering to a number of issues raised in these documents. While GRIP can be seamlessly applied to DiffServ (and even legacy) Internet, a marginal increase in QoS is envisioned in these existing scenarios. The performance of GRIP are in fact related to the capability of routers to locally take decisions about the degree of congestion in the network, and suitably drop probe packets when congestion conditions are detected. However, such decisions are localized and do not involve any coordination among routers and between routers and end points. Thus, GRIP opens up a future smooth migration path toward gradually improved QoS, as routers in different domain will be enhanced (e.g., with measurement-based admission decision criteria) without losing inter-operability with installed devices. Strict end-to-end QoS guarantees are eventually provided when all the crossed routers are equipped with GRIP capabilities.
A Migration Path to provide End-to-End QoS over Stateless Networks by Means of a Probing-driven Admission Control
FEMMINELLA, Mauro
2000
Abstract
This document proposes a new admission control paradigm, called GRIP (Gauge&Gate Reservation with Independent Probing), devised to transparently operate over DiffServ domains. GRIP relies the decision to admit a new flow upon the successful and timely delivery, through the Internet, of probe packets independently generated by the end points. The key idea is to use failed receptions of probes to discover, at the end points, that a congestion condition occurs in the network, and to reject the new admission request. This idea is extremely close to what TCP congestion control technique does, but it is used in the novel context of admission control. Similarly to TCP, GRIP is a pure end-to-end distributed protocol operation, whose intelligence is kept at the edge of the network and whose operation (i) does not require any specific protocol implementation in the core routers, which are stateless and remain oblivious to individual flows, and (ii) does not require any specific peer and router agreement on the probes payload information. GRIP is coherent with the architectural assumptions of RFCs [1,2] and attempts answering to a number of issues raised in these documents. While GRIP can be seamlessly applied to DiffServ (and even legacy) Internet, a marginal increase in QoS is envisioned in these existing scenarios. The performance of GRIP are in fact related to the capability of routers to locally take decisions about the degree of congestion in the network, and suitably drop probe packets when congestion conditions are detected. However, such decisions are localized and do not involve any coordination among routers and between routers and end points. Thus, GRIP opens up a future smooth migration path toward gradually improved QoS, as routers in different domain will be enhanced (e.g., with measurement-based admission decision criteria) without losing inter-operability with installed devices. Strict end-to-end QoS guarantees are eventually provided when all the crossed routers are equipped with GRIP capabilities.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
