RFC 2892 (rfc2892) - Page 1 of 52

The Cisco SRP MAC Layer Protocol

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Network Working Group                                          D. Tsiang
Request for Comments: 2892                                     G. Suwala
Category: Informational                                    Cisco Systems
                                                             August 2000


                    The Cisco SRP MAC Layer Protocol

Status of this Memo

   This memo provides information for the Internet community.  It does
   not specify an Internet standard of any kind.  Distribution of this
   memo is unlimited.

Copyright Notice

   Copyright (C) The Internet Society (2000).  All Rights Reserved.

Abstract

   This document specifies the MAC layer protocol, "Spatial Reuse
   Protocol" (SRP) for use with ring based media. This is a second
   version of the protocol (V2).

   The primary requirements for SRP are as follows:

   -  Efficient use of bandwidth using:
          spatial reuse of bandwidth
          local reuse of bandwidth
          minimal protocol overhead
   -  Support for priority traffic
   -  Scalability across a large number of nodes or stations attached to
      a ring
   -  "Plug and play" design without a software based station management
      transfer (SMT) protocol or ring master negotiation as seen in
      other ring based MAC protocols [1][2]
   -  Fairness among nodes using the ring
   -  Support for ring based redundancy (error detection, ring wrap,
      etc.) similar to that found in SONET BLSR specifications.
   -  Independence of physical layer (layer 1) media type.

   This document defines the terminology used with SRP, packet formats,
   the protocol format, protocol operation and associated protocol
   finite state machines.







Tsiang & Suwala              Informational
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