RFC 2124 (rfc2124) - Page 1 of 21
Cabletron's Light-weight Flow Admission Protocol Specification Version 1
Alternative Format: Original Text Document
Network Working Group P. Amsden
Request for Comments: 2124 J. Amweg
Category: Informational P. Calato
S. Bensley
G. Lyons
Cabletron Systems Inc.
March 1997
Cabletron's Light-weight Flow Admission Protocol Specification
Version 1.0
Status of this Memo
This memo provides information for the Internet community. This memo
does not specify an Internet standard of any kind. Distribution of
this memo is unlimited.
Abstract
Light-weight Flow Admission Protocol, LFAP, allows an external Flow
Admission Service (FAS) to manage flow admission at the switch,
allowing flexible Flow Admission Services to be deployed by a vendor
or customer without changes to, or undue burden on, the switch.
Specifically, this document specifies the protocol between the switch
Connection Control Entity (CCE) and the external FAS. Using LFAP, a
Flow Admission Service can: allow or disallow flows, define the
parameters under which a given flow is to operate (operating policy)
or, redirect the flow to an alternate destination. The FAS may also
maintain details of current or historical flows for billing, capacity
planning and other purposes.
Table of Contents
1. Introduction .................................................. 2
2. Message Flows ................................................. 3
3. Message Contents and Format ................................... 4
3.1. IE Formats ............................................. 5
3.2. Flow Admission Request (FAR) Message ................... 14
3.3. Flow Admission Acknowledge (FAA) Message ............... 15
3.4. Flow Admission Update (FAU) Message .................... 15
3.5 Flow Update Notification (FUN) Message .................. 16
3.6. Flow Update Acknowledge (FUA) Message .................. 16
3.7. Flow Change Request (FCR) Message ...................... 17
3.8. Flow Change Acknowledge (FCA) Message .................. 17
3.9. Administrative Request (AR) Message .................... 18
3.10. Administrative Request Acknowledge (ARA) Message ...... 18
4. Error Handling ................................................ 18
Amsden, et. al. Informational