Two RFCs coauthored by Georgios Karagiannis

Georgios Karagiannis, assistant professor at DACS, has coauthored two RFSc. Both RFC5974 and RFC5977 have been published as Experimental RFCs in Octuber 2010. RFC5974 describes “NSIS Signaling Layer Protocol (NSLP) for Quality-of-Service Signaling”, while RFC5977 describes “RMD-QOSM: The NSIS Quality-of-Service Model for Resource Management in Diffserv”. The complete RFCs are available at IETF website:

RFC5974: NSIS Signaling Layer Protocol (NSLP) for Quality-of-Service Signaling

This specification describes the NSIS Signaling Layer Protocol (NSLP) for signaling Quality of Service (QoS) reservations in the Internet. It is in accordance with the framework and requirements developed in NSIS. Together with General Internet Signaling Transport (GIST), it provides functionality similar to RSVP and extends it. The QoS NSLP is independent of the underlying QoS specification or architecture and provides support for different reservation models. It is simplified by the elimination of support for multicast flows. This specification explains the overall protocol approach, describes the design decisions made, and provides examples. It specifies object, message formats, and processing rules.

RFC5977: RMD-QOSM: The NSIS Quality-of-Service Model for Resource Management in Diffserv

This document describes a Next Steps in Signaling (NSIS) Quality-of- Service (QoS) Model for networks that use the Resource Management in Diffserv (RMD) concept. RMD is a technique for adding admission control and preemption function to Differentiated Services (Diffserv) networks. The RMD QoS Model allows devices external to the RMD network to signal reservation requests to Edge nodes in the RMD network. The RMD Ingress Edge nodes classify the incoming flows into traffic classes and signals resource requests for the corresponding traffic class along the data path to the Egress Edge nodes for each flow. Egress nodes reconstitute the original requests and continue forwarding them along the data path towards the final destination. In addition, RMD defines notification functions to indicate overload situations within the domain to the Edge nodes.