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A Two-Level Architecture for Internet Signaling

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  1. A Two-Level Architecture for Internet Signaling Bob Lindell Bob Braden Computer Networks Division USC/ISI

  2. RSVP Reuse • MPLS • VPN Provisioning • Optical Network Path Setup • Link Layer QoS Setup • TIST • AFSP

  3. Two Level Architecture • ALSP – Application Layer Signaling Protocol • End-to-End Semantics • RSVP, MPLS, … • CSTP – Common Signaling Transport Protocol • Hop-by-Hop Semantics • Transport, Security, State Management, Demultiplexing

  4. Decompose Functionality • Path (Tree) Oriented Signals • Object Based Message Format • Soft State • Multicast Security • Reliable Multicast Transport (Congestion Control, Ordered Delivery) • Fragmentation and Message Bundling • Tunneling • Transport without Reliability Mechanisms

  5. CSTP Downcalls • SendNewSAPU • Reliably deliver a new soft state entities and initiate refreshes • SendModSAPU • Reliably deliver a modification of an existing soft state entities • SendTearSAPU • Reliably deliver a soft state deletion request • SendEventSAPU • Reliably deliver a stateless message • SendInfoSAPU • Send a stateless message without reliability or refreshes

  6. CSTP Upcalls • SendFail • Asynchronous error notification • RecvNewSAPU • Receive new soft state entities • RecvModSAPU • Receive modifications of new soft state entities • RecvTearSAPU • Receive deletions of soft state entities • RegenSAPU • Request for ALSP layer to regenerate a subsequent refresh

  7. Waypoint • An incremental approach to realizing CSTP (3 layers?) • Remove complex (Transport) features • Soft State • Reliable Transport • Bundling • More like a IP/IPSEC/UDP for signaling • Demultiplexing • Options • Checksum • Security

  8. Documents • A Two-Level Architecture for Internet Signaling • Waypoint – A Path Oriented Delivery Mechanism for IP based Control, Measurement, and Signaling Protocols • http://www.isi.edu/rsvp/pub.html

  9. Beyond Signaling • Path Oriented Network Management • Traceroute, Pathchar • Topology Mapping

  10. Conclusion • Lessons learned could be applied to an RSVPv2 • Much broader applicability with all the new path oriented signaling protocols • IETF NSIS working group • Should we get there incrementally? • There are interesting Path Oriented Network Management functionality yet to be explored