RFC 2961 (rfc2961) - Page 2 of 34

RSVP Refresh Overhead Reduction Extensions

RFC 2961       RSVP Refresh Overhead Reduction Extensions     April 2001


Table of Contents

   1      Introduction and Background ................................2
   1.1    Trigger and Refresh Messages ...............................4
   2      Refresh-Reduction-Capable Bit ..............................4
   3      RSVP Bundle Message ........................................5
   3.1    Bundle Header ..............................................5
   3.2    Message Formats ............................................6
   3.3    Sending RSVP Bundle Messages ...............................7
   3.4    Receiving RSVP Bundle Messages .............................8
   4      MESSAGE_ID Extension .......................................8
   4.1    Modification of Standard Message Formats ...................9
   4.2    MESSAGE_ID Objects ........................................10
   4.3    MESSAGE_ID_ACK and MESSAGE_ID_NACK Objects ................11
   4.4    Ack Message Format ........................................11
   4.5    MESSAGE_ID Object Usage ...................................12
   4.6    MESSAGE_ID_ACK Object and MESSAGE_ID_NACK Object Usage ....14
   4.7    Multicast Considerations ..................................15
   4.7.1  Reference RSVP/Routing Interface ..........................16
   4.8    Compatibility .............................................16
   5      Summary Refresh Extension .................................17
   5.1    MESSAGE_ID LIST, SRC_LIST and MCAST_LIST Objects ..........18
   5.2    Srefresh Message Format ...................................24
   5.3    Srefresh Message Usage ....................................25
   5.4    Srefresh NACK .............................................28
   5.5    Preserving RSVP Soft State ................................28
   5.6    Compatibility .............................................29
   6      Exponential Back-Off Procedures ...........................29
   6.1    Outline of Operation ......................................30
   6.2    Time Parameters ...........................................30
   6.3    Retransmission Algorithm ..................................31
   6.4    Performance Considerations ................................31
   7      Acknowledgments ...........................................31
   8      Security Considerations ...................................32
   9      References ................................................32
   10     Authors' Addresses ........................................33
   11     Full Copyright Statement...................................34

1. Introduction and Background

   Standard RSVP [RFC 2205] maintains state via the generation of RSVP
   refresh messages.  Refresh messages are used to both synchronize
   state between RSVP neighbors and to recover from lost RSVP messages.
   The use of Refresh messages to cover many possible failures has
   resulted in a number of operational problems.  One problem relates to
   scaling, another relates to the reliability and latency of RSVP
   Signaling.




Berger, et al.              Standards Track