RFC 2998 (rfc2998) - Page 2 of 31


A Framework for Integrated Services Operation over Diffserv Networks



Alternative Format: Original Text Document



RFC 2998       Integrated Services Over Diffserv Networks  November 2000


Table of Contents

   1. Introduction .................................................  3
   1.1 Integrated Services Architecture ............................  3
   1.2 RSVP ........................................................  3
   1.3 Diffserv ....................................................  4
   1.4 Roles of Intserv, RSVP and Diffserv .........................  4
   1.5 Components of Intserv, RSVP and Diffserv ....................  5
   1.6 The Framework ...............................................  6
   1.7 Contents ....................................................  6
   2. Benefits of Using Intserv with Diffserv ......................  7
   2.1 Resource Based Admission Control ............................  7
   2.2 Policy Based Admission Control ..............................  8
   2.3 Assistance in Traffic Identification/Classification .........  8
   2.3.1 Host Marking ..............................................  9
   2.3.2 Router Marking ............................................  9
   2.4 Traffic Conditioning ........................................ 10
   3. The Framework ................................................ 10
   3.1 Reference Network ........................................... 11
   3.1.1 Hosts ..................................................... 11
   3.1.2 End-to-End RSVP Signaling ................................. 12
   3.1.3 Edge Routers .............................................. 12
   3.1.4 Border Routers ............................................ 12
   3.1.5 Diffserv Network Region ................................... 13
   3.1.6 Non-Diffserv Network Regions .............................. 13
   3.2 Service Mapping ............................................. 13
   3.2.1 Default Mapping ........................................... 14
   3.2.2 Network Driven Mapping .................................... 14
   3.2.3 Microflow Separation ...................................... 14
   3.3 Resource Management in Diffserv Regions ..................... 15
   4. Detailed Examples of the Operation of
      Intserv over Diffserv Regions ................................ 16
   4.1 Statically Provisioned Diffserv Network Region .............. 16
   4.1.1 Sequence of Events in Obtaining End-to-end QoS ............ 16
   4.2 RSVP-Aware Diffserv Network Region .......................... 18
   4.2.1 Aggregated or Tunneled RSVP ............................... 19
   4.2.3 Per-flow RSVP ............................................. 20
   4.2.4 Granularity of Deployment of RSVP Aware Routers ........... 20
   4.3 Dynamically Provisioned, Non-RSVP-aware Diffserv Region ..... 21
   5. Implications of the Framework for Diffserv Network Regions ... 21
   5.1 Requirements from Diffserv Network Regions .................. 21
   5.2 Protection of Intserv Traffic from Other Traffic ............ 22
   6. Multicast .................................................... 22
   6.1 Remarking of packets in branch point routers ................ 24
   6.2 Multicast SLSs and Heterogeneous Trees ...................... 25
   7. Security Considerations ...................................... 26
   7.1 General RSVP Security ....................................... 26
   7.2 Host Marking ................................................ 26



Bernet, et al.               Informational