RFC 5812, "Forwarding and Control Element Separation (ForCES) Forwarding Element Model", March 2010

Note: This RFC has been updated by RFC 7408

Errata ID: 5363
Status: Held for Document Update
Type: Editorial
Publication Format(s) : TEXT
Reported By: Nikolai Malykh
Date Reported: 2018-05-18
Held for Document Update by: Alvaro Retana
Date Held: 2019-09-10

Section 3.2.8 says:

   An interesting issue related to class inheritance is backward
   compatibility between a descendant and an ancestor class.  Consider
   the following hypothetical scenario where a standardized LFB class
   "L1" exists.  Vendor A builds an FE that implements LFB "L1", and
   vendor B builds a CE that can recognize and operate on LFB "L1".
   Suppose that a new LFB class, "L2", is defined based on the existing
   "L1" class by extending its capabilities incrementally.  Let us
   examine the FE backward-compatibility issue by considering what would
   happen if vendor B upgrades its FE from "L1" to "L2" and vendor C's





Halpern & Hadi Salim         Standards Track                   [Page 29]

RFC 5812                     ForCES FE Model                  March 2010


   CE is not changed.  The old L1-based CE can interoperate with the new
   L2-based FE if the derived LFB class "L2" is indeed backward
   compatible with the base class "L1".

It should say:

   An interesting issue related to class inheritance is backward
   compatibility between a descendant and an ancestor class.  Consider
   the following hypothetical scenario where a standardized LFB class
   "L1" exists.  Vendor A builds an FE that implements LFB "L1", and
   vendor B builds a CE that can recognize and operate on LFB "L1".
   Suppose that a new LFB class, "L2", is defined based on the existing
   "L1" class by extending its capabilities incrementally.  Let us
   examine the FE backward-compatibility issue by considering what would
   happen if vendor A upgrades its FE from "L1" to "L2" and vendor B's





Halpern & Hadi Salim         Standards Track                   [Page 29]

RFC 5812                     ForCES FE Model                  March 2010


   CE is not changed.  The old L1-based CE can interoperate with the new
   L2-based FE if the derived LFB class "L2" is indeed backward
   compatible with the base class "L1".

Notes:

Confusion in the notation of vendors.

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