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Versions: (draft-jhs-forces-protoextenstion) 00 01 02 03 04 05 06 RFC 7391

Internet Engineering Task Force                            J. Hadi Salim
Internet-Draft                                         Mojatatu Networks
Updates: 7121,5810 (if approved)                       September 9, 2014
Intended status: Standards Track
Expires: March 13, 2015


                       ForCES Protocol Extensions
                  draft-ietf-forces-protoextension-06

Abstract

   Experience in implementing and deploying ForCES architecture has
   demonstrated need for a few small extensions both to ease
   programmability and to improve wire efficiency of some transactions.
   The ForCES protocol is extended with a table range operation and a
   new extension for error handling.  This documents updates both RFC
   5810 and RFC 7121 semantics to achieve that end goal.

Status of this Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF).  Note that other groups may also distribute
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at http://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on March 13, 2015.

Copyright Notice

   Copyright (c) 2014 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of



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   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.


Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  3
     1.1.  Terminology and Conventions  . . . . . . . . . . . . . . .  3
       1.1.1.  Requirements Language  . . . . . . . . . . . . . . . .  3
       1.1.2.  Definitions  . . . . . . . . . . . . . . . . . . . . .  3
   2.  Problem Overview . . . . . . . . . . . . . . . . . . . . . . .  4
     2.1.  Table Ranges . . . . . . . . . . . . . . . . . . . . . . .  4
     2.2.  Error codes  . . . . . . . . . . . . . . . . . . . . . . .  5
   3.  Protocol Update  . . . . . . . . . . . . . . . . . . . . . . .  5
     3.1.  Table Ranges . . . . . . . . . . . . . . . . . . . . . . .  5
     3.2.  Error Codes  . . . . . . . . . . . . . . . . . . . . . . .  7
       3.2.1.  New Codes  . . . . . . . . . . . . . . . . . . . . . .  7
       3.2.2.  Private Vendor Codes . . . . . . . . . . . . . . . . .  8
       3.2.3.  Extended Result TLV  . . . . . . . . . . . . . . . . .  8
         3.2.3.1.  Extended Result Backward compatibility . . . . . .  9
     3.3.  Large Table Dumping  . . . . . . . . . . . . . . . . . . . 10
   4.  Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 11
   5.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . . 12
   6.  Security Considerations  . . . . . . . . . . . . . . . . . . . 13
   7.  References . . . . . . . . . . . . . . . . . . . . . . . . . . 13
     7.1.  Normative References . . . . . . . . . . . . . . . . . . . 13
     7.2.  Informative References . . . . . . . . . . . . . . . . . . 14
   Appendix A.  Appendix A - New FEPO version . . . . . . . . . . . . 14
   Author's Address . . . . . . . . . . . . . . . . . . . . . . . . . 24






















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1.  Introduction

   Experience in implementing and deploying ForCES architecture has
   demonstrated need for a few small extensions both to ease
   programmability and to improve wire efficiency of some transactions.
   This document describes a few extensions to the ForCES Protocol
   Specification [RFC5810] semantics to achieve that end goal.

   This document describes and justifies the need for 2 small extensions
   which are backward compatible.  The document also clarifies details
   of how dumping of a large table residing on an FE (Forwarding Engine)
   is achieved.  To summarize:

   1.  A table range operation to allow a controller or control
       application to request an arbitrary range of table rows is
       introduced.

   2.  Additional error codes returned to the controller (or control
       application) by an FE are introduced.  Additionally a new
       extension to carry details on error codes is introduced.  As a
       result the (FE Protocol Object) FEPO LFB is updated over the
       definition in [RFC7121].

   3.  While already supported, an FE response to a GET request of a
       large table which does not fit in a single PL message is not
       described in [RFC5810].  This document clarifies the details.

1.1.  Terminology and Conventions

1.1.1.  Requirements Language

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in [RFC2119].

1.1.2.  Definitions

   This document reiterates the terminology defined in several ForCES
   documents [RFC3746], [RFC5810], [RFC5811], and [RFC5812] for the sake
   of contextual clarity.

      Control Engine (CE)

      Forwarding Engine (FE)







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      FE Model

      LFB (Logical Functional Block) Class (or type)

      LFB Instance

      LFB Model

      LFB Metadata

      ForCES Component

      LFB Component

      ForCES Protocol Layer (ForCES PL)

      ForCES Protocol Transport Mapping Layer (ForCES TML)


2.  Problem Overview

   In this section we present sample use cases to illustrate each
   challenge being addressed.

2.1.  Table Ranges

   Consider, for the sake of illustration, an FE table with 1 million
   reasonably sized table rows which are sparsely populated.  Assume,
   again for the sake of illustration, that there are 2000 table rows
   sparsely populated between the row indices 23-10023.

   Implementation experience has shown that existing approaches for
   retrieving or deleting a sizable number of table rows to be both
   programmatically tedious and inefficient on utilization of both
   compute and wire resources.

   By Definition, ForCES GET and DEL requests sent from a controller (or
   control app) are prepended with a path to a component and sent to the
   FE.  In the case of indexed tables, the component path can either
   point to a table or a table row index.

   As an example, a control application attempting to retrieve the first
   2000 table rows appearing between row indices 23 and 10023 can
   achieve its goal in one of:

   o  Dump the whole table and filter for the needed 2000 table rows.





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   o  Send upto 10000 ForCES PL requests, incrementing the index by one
      each time, and stop when the needed 2000 entries are retrieved.

   o  If the application had knowledge of which table rows existed (not
      unreasonable given the controller is supposed to be aware of state
      within an NE), then the application could take advantage of ForCES
      batching to send fewer large messages (each with different path
      entries for a total of two thousand).

   As argued, while the above options exist, all are tedious.

2.2.  Error codes

   [RFC5810] has defined a generic set of error codes that are to be
   returned to the CE from an FE.  Deployment experience has shown that
   it would be useful to have more fine grained error codes.  As an
   example, the error code E_NOT_SUPPORTED could be mapped to many FE
   error source possibilities that need to be then interpreted by the
   caller based on some understanding of the nature of the sent request.
   This makes debugging more time consuming.


3.  Protocol Update

   This section describes normative update to the ForCES protocol for
   issues discussed in Section 2.

3.1.  Table Ranges

   We define a new TLV, TABLERANGE-TLV (type ID 0x117) that will be
   associated with the PATH-DATA TLV in the same manner the KEYINFO-TLV
   is.


      0                   1                   2                   3
      0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |  Type (0x117)               |     Length                      |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                         Start Index                           |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
      |                         End Index                             |
      +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

                Figure 1: ForCES table range request Layout

   Figure 1 shows how this new TLV is constructed.




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      OPER = GET
             PATH-DATA:
               flags = F_SELTABRANGE,  IDCount = 2, IDs = {1,6}
               TABLERANGE-TLV content = {11,23}

                   Figure 2: ForCES table range request

   Figure 2 illustrates a GET request for a range of rows 11 to 23 of a
   table with component path of "1/6".

   Path flag of F_SELTABRANGE (0x2 i.e bit 1, where bit 0 is F_SELKEY as
   defined in RFC 5810) MUST be set to indicate the presence of the
   TABLERANGE-TLV.  The pathflag bit F_SELTABRANGE can only be used in a
   GET or DEL and is mutually exclusive with F_SELKEY.  The FE MUST
   enforce the path flag constraints and ensure that the selected path
   belongs to a defined indexed table component.  Any violation of these
   constraints MUST be rejected with an error code of E_INVALID_TFLAGS
   with a description of what the problem is when using extended error
   reporting (refer to Section 3.2).

   It should be noted that there are combination of path selection
   mechanisms that should not appear together for the sake of simplicity
   of operations.  These include: TABLERANGE-TLV and KEYINFO-TLV as well
   as multiple nested TABLERANGE-TLVs.

   The TABLERANGE-TLV contents constitute:

   o  A 32 bit start index.  An index of 0 implies the beginning of the
      table row.

   o  A 32 bit end index.  A value of 0xFFFFFFFF implies the last entry.

   The response for a table range query will either be:

   o  The requested table data returned (when at least one referenced
      row is available); in such a case, a response with a path pointing
      to the table and whose data content contains the row(s) will be
      sent to the CE.  The data content MUST be encapsulated in
      sparsedata TLV.  The sparse data TLV content will have the "I" (in
      ILV) for each table row indicating the table indices.

   o  An EXTENDEDRESULT-TLV (refer to Section 3.2.3) when:

      *  Response is to a range delete request.  The Result will either
         be:

         +  A success if any of the requested-for rows is deleted




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         +  A proper error code if none of the requested for rows can be
            deleted

      *  data is absent where the result code of E_EMPTY with an
         optional content string describing the nature of the error
         (refer to Section 3.2).

      *  When both a path key and path table range are reflected on the
         the pathflags, an error code of E_INVALID_TFLAGS with an
         optional content string describing the nature of the error
         (refer to Section 3.2).

      *  other standard ForCES errors (such as ACL constraints trying to
         retrieve contents of an unreadable table), accessing unknown
         components etc.

3.2.  Error Codes

   We define several things:

   1.  A new set of error codes.

   2.  Allocating some reserved codes for private use.

   3.  A new TLV, EXTENDEDRESULT-TLV (0x118) that will carry a code
       (which will be a superset of what is currently specified in
       [RFC5810]) but also an optional cause content.  This is
       illustrated in Figure 3.

3.2.1.  New Codes

   EXTENDEDRESULT-TLV Result Value is 32 bits and is a superset of RFC
   5810 Result TLV Result Value.  The new version code space is 32 bits
   as opposed to the RFC 5810 code size of 8 bits.  The first 8 bit
   values(256 codes) are common to both code spaces.
















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   +------------+-------------------------+----------------------------+
   | Code       | Mnemonic                | Details                    |
   +------------+-------------------------+----------------------------+
   | 0x18       | E_TIMED_OUT             | A time out occured while   |
   |            |                         | processing the message     |
   | 0x19       | E_INVALID_TFLAGS        | Invalid table flags        |
   | 0x1A       | E_INVALID_OP            | Requested operation is     |
   |            |                         | invalid                    |
   | 0x1B       | E_CONGEST_NT            | Node Congestion            |
   |            |                         | notification               |
   | 0x1C       | E_COMPONENT_NOT_A_TABLE | Component not a table      |
   | 0x1D       | E_PERM                  | Operation not permitted    |
   | 0x1E       | E_BUSY                  | System is Busy             |
   | 0x1F       | E_EMPTY                 | Table is empty             |
   | 0x20       | E_UNKNOWN               | A generic catch all error  |
   |            |                         | code. Carries a string to  |
   |            |                         | further extrapolate what   |
   |            |                         | the error implies.         |
   +------------+-------------------------+----------------------------+

                            Table 1: New codes

3.2.2.  Private Vendor Codes

   Codes 0x100-0x200 are reserved for use as private codes.  Since these
   are freely available it is expected that the FE and CE side
   implementations will both understand/interpret the semantics of any
   used codes and avoid any conflicts.

3.2.3.  Extended Result TLV


        0                   1                   2                   3
        0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |   Type = EXTENDEDRESULT-TLV   |              Length           |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |                        Result Value                           |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
       |                    Optional Cause content                     |
       .                                                               .
       |                                                               |
       +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+

                       Figure 3: EXTENDEDRESULT-TLV






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   o  Like all other ForCES TLVs, the EXTENDEDRESULT-TLV is expected to
      be 32 bit aligned.

   o  The EXTENDEDRESULT-TLV Result Value derives and extends from the
      same current namespace that is used by RESULT-TLV Result Value as
      specified in RFC 5810, section 7.1.7.  The main difference is that
      we now have a 32 bit result value (as opposed to old 8 bit).

   o  The optional result content is defined to further disambiguate the
      result value.  It is expected UTF-8 string values to be used.  The
      content result value is intended to be consumed by the (human)
      operator and implementations may choose to specify different
      contents for the same error code.  Additionally, future codes may
      specify cause contents to be of types other than string.

   o  It is recommended that the maximum size of the cause string should
      not exceed 32 bytes.  The cause string is not standardized by this
      document.

3.2.3.1.  Extended Result Backward compatibility

   To support backward compatibility, we update and the FEPO LFB (in
   Appendix A) version to 1.2.  We also add a new component ID 16 (named
   EResultAdmin) and a capability Component ID 32 (named EResultCapab).

   An FE will advertise its capability to support extended TLVs via the
   EResultCapab table.  When an FE is capable of responding with both
   extended results and older result TLVs, it will have two table rows
   one for each supported value.  By default an FE capable of supporting
   both modes will assume the lowest common denominator i.e EResultAdmin
   will be EResultNotSupported; and will issue responses using RESULT-
   TLVs.  It should be noted an FE advertising FEPO version 1.2 MUST
   support EXTENDEDRESULT-TLVs at minimum.

   On an FE which supports both RESULT-TLVs and EXTENDEDRESULT-TLVs, a
   master CE can turn on support for extended results by setting the
   EResultAdmin value to 2 in which case the FE MUST switch over to
   sending only EXTENDEDRESULT-TLVs.  Likewise a master CE can turn off
   extended result responses by writing a 1 to the EResultAdmin.  An FE
   that does not support one mode or other MUST reject setting of
   EResultAdmin to a value it does not support by responding with an
   error code of E_NOT_SUPPORTED.  It is expected that all CEs
   participating in a high availability(HA) mode be capable of
   supporting FEPO version 1.2 whenever EResultAdmin is set to strict
   support of EXTENDEDRESULT-TLVs.  The consensus between CEs in an HA
   setup to set strict support of EXTENDEDRESULT-TLVs is out of scope
   for this document.




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3.3.  Large Table Dumping

   Imagine a GET request to a path that is a table i.e a table dump.
   Such a request is sent to the FE with a specific correlator, say X.
   Imagine this table to have a large number of entries at the FE.  For
   the sake of illustration, lets say millions of rows.  This requires
   that the FE delivers the response over multiple messages, all using
   the same correlator X.

   The protocol document [RFC5810] does not adequately describe how a
   large multi-part GET response message is delivered.  The text in this
   section clarifies.  We limit the discussion to a table object only.

   Implementation experience of dumping large tables indicates we can
   use the transaction flags to indicate that a GET response is the
   beginning, middle or end of a multi-part message.  In other words we
   mirror the effect of an atomic transaction sent by a CE to an FE.


































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            CE PL                                                  FE PL

              |                                                      |
              | (0) Query, Path-to-a-large-table, OP=GET             |
              |----------------------------------------------------->|
              |                correlator = X                        |
              |                                                      |
              | (1) Query-Response, SOT,AT, OP=GET-RESPONSE, DATA    |
              |<-----------------------------------------------------|
              |                correlator = X                        |
              |             DATA TLV (SPARSE/FULL)                   |
              |                                                      |
              | (2) Query-Response, MOT,AT, OP=GET-RESPONSE, DATA    |
              |<-----------------------------------------------------|
              |                correlator = X                        |
              |             DATA TLV (SPARSE/FULL)                   |
              |                                                      |
              | (3) Query-Response, MOT,AT, OP=GET-RESPONSE, DATA    |
              |<-----------------------------------------------------|
              |                correlator = X                        |
              |             DATA TLV (SPARSE/FULL)                   |
              .                                                      .
              .                                                      .
              .                                                      .
              .                                                      .
              |                                                      |
              | (N) Query-Response, MOT,AT, OP=GET-RESPONSE, DATA    |
              |<-----------------------------------------------------|
              |                correlator = X                        |
              |             DATA TLV (SPARSE/FULL)                   |
              |                                                      |
              | (N) Query-Response, EOT,AT, OP=GET-RESPONSE          |
              |<-----------------------------------------------------|
              |                correlator = X                        |
              |             RESULT TLV (SUCCESS)                     |
              |                                                      |

                       Figure 4: EXTENDEDRESULT-TLV

   The last message to go to the CE, which carries the EOT flag, MUST
   NOT carry any data.  This allows us to mirror ForCES 2PC messaging
   [RFC5810] where the last message is an empty commit message.  GET
   response will carry a result code TLV in such a case.


4.  Acknowledgements

   The author would like to thank Evangelos Haleplidis and Joel Halpern



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   for discussions that made this document better.  Adrian Farrel did an
   excellent AD review of the document which improved the quality of
   this document.  Tobias Gondrom did the Security Directorate review.
   Brian Carpenter did the Gen-ART review.  Nevil Brownlee performed the
   Operations Directorate review.  S Moonesamy(SM) worked hard to review
   our publication process.  Pearl Liang caught issues in the IANA
   specification.

   The author would like to thank the following IESG members who
   reviewed and improved this document: Alia Atlas, Barry Leiba, Brian
   Haberman, Kathleen Moriarty, Richard Barnes, and Spencer Dawkins.


5.  IANA Considerations

   This document registers two new top Level TLVs and two new path flags
   and updates an IANA registered FE Protocol object Logical Functional
   Block (LFB).

   The Appendix A defines an update to the FE Protocol Object LFB to
   version 1.2.  The IANA registry
   https://www.iana.org/assignments/forces sub-registy "Logical
   Functional Block (LFB) Class Names and Class Identifiers" will need
   to be append for FE Protocol Object LFB version 1.2 and this document
   reflected in the reference column.

   Updates are required to the "TLV types" subregistry for the TLVs
   below.

   The following new TLVs are defined:

   o  TABLERANGE-TLV (type ID 0x117)

   o  EXTENDEDRESULT-TLV (type ID 0x118)

   subregistry "RESULT-TLV Result Values" is affected by the entries
   below.

   The Defined RESULT-TLV Result Values are changed:

   o  codes 0x21-0xFE are unassigned.

   o  codes 0x18-0x20 are defined by this document in Section 3.2.1.

   o  codes 0x100-0x200 are reserved for private use.

   A new sub-registry for EXTENDEDRESULT-TLV Result Values needs to be
   created.  The codes 0x00-0xff are mirrored from the RESULT-TLV Result



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   Values sub-registry.  Any new allocations of this code range (in the
   range 0x21-0xfe) must happen only within the new sub-registry and not
   in RESULT-TLV Result Values sub-registry.  The codes 0x100-0x200 are
   reserved for private use as described earlier and the code ranges
   0x21-0xfe and 0x201-0xffffffff should be marked as Unassigned with
   the IANA allocation policy of Specification Required [RFC5226].  The
   Designated Expert (DE) needs to ensure existing deployments are not
   broken by any specified request.  The DE should post a given code
   request to the ForCES WG mailing list (or a successor designated by
   the Area Director) for any comment and review.  The DE should then
   either approve or deny the registration request, publish a notice of
   the decision to the ForCES WG mailing list or its successor, and
   inform IANA of his/her decision.  A denial notice must be justified
   by an explanation and, in the cases where it is possible, concrete
   suggestions on how the request can be modified so as to become
   acceptable.


6.  Security Considerations

   The security considerations that have been described in the ForCES
   protocol [RFC5810] apply to this document as well.


7.  References

7.1.  Normative References

   [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
              Requirement Levels", BCP 14, RFC 2119, March 1997.

   [RFC5226]  Narten, T. and H. Alvestrand, "Guidelines for Writing an
              IANA Considerations Section in RFCs", BCP 26, RFC 5226,
              May 2008.

   [RFC5810]  Doria, A., Hadi Salim, J., Haas, R., Khosravi, H., Wang,
              W., Dong, L., Gopal, R., and J. Halpern, "Forwarding and
              Control Element Separation (ForCES) Protocol
              Specification", RFC 5810, March 2010.

   [RFC5811]  Hadi Salim, J. and K. Ogawa, "SCTP-Based Transport Mapping
              Layer (TML) for the Forwarding and Control Element
              Separation (ForCES) Protocol", RFC 5811, March 2010.

   [RFC5812]  Halpern, J. and J. Hadi Salim, "Forwarding and Control
              Element Separation (ForCES) Forwarding Element Model",
              RFC 5812, March 2010.




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   [RFC7121]  Ogawa, K., Wang, W., Haleplidis, E., and J. Hadi Salim,
              "High Availability within a Forwarding and Control Element
              Separation (ForCES) Network Element", RFC 7121,
              February 2014.

7.2.  Informative References

   [RFC3746]  Yang, L., Dantu, R., Anderson, T., and R. Gopal,
              "Forwarding and Control Element Separation (ForCES)
              Framework", RFC 3746, April 2004.


Appendix A.  Appendix A - New FEPO version

   This version of FEPO updates the earlier one given in RFC 7121.  The
   xml has been validated against the schema defined in [RFC5812].


   <LFBLibrary xmlns="urn:ietf:params:xml:ns:forces:lfbmodel:1.0"
      xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
      xsi:noNamespaceSchemaLocation="lfb-schema.xsd" provides="FEPO">
      <!-- XXX -->
      <dataTypeDefs>
         <dataTypeDef>
            <name>CEHBPolicyValues</name>
            <synopsis>
               The possible values of CE heartbeat policy
            </synopsis>
            <atomic>
               <baseType>uchar</baseType>
               <specialValues>
                  <specialValue value="0">
                     <name>CEHBPolicy0</name>
                     <synopsis>
                         The CE will send heartbeats to the FE
                         every CEHDI timeout if no other messages
                         have been sent since.
                     </synopsis>
                  </specialValue>
                  <specialValue value="1">
                     <name>CEHBPolicy1</name>
                     <synopsis>
                         The CE will not send heartbeats to the FE
                     </synopsis>
                  </specialValue>
               </specialValues>
            </atomic>
         </dataTypeDef>



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         <dataTypeDef>
            <name>FEHBPolicyValues</name>
            <synopsis>
                The possible values of FE heartbeat policy
            </synopsis>
            <atomic>
               <baseType>uchar</baseType>
               <specialValues>
                  <specialValue value="0">
                     <name>FEHBPolicy0</name>
                     <synopsis>
                         The FE will not generate any heartbeats
                         to the CE
                     </synopsis>
                  </specialValue>
                  <specialValue value="1">
                     <name>FEHBPolicy1</name>
                     <synopsis>
                        The FE generates heartbeats to the CE every FEHI
                        if no other messages have been sent to the CE.
                     </synopsis>
                  </specialValue>
               </specialValues>
            </atomic>
         </dataTypeDef>
         <dataTypeDef>
            <name>FERestartPolicyValues</name>
            <synopsis>
               The possible values of FE restart policy
            </synopsis>
            <atomic>
               <baseType>uchar</baseType>
               <specialValues>
                  <specialValue value="0">
                     <name>FERestartPolicy0</name>
                     <synopsis>
                        The FE restarts its state from scratch
                     </synopsis>
                  </specialValue>
               </specialValues>
            </atomic>
         </dataTypeDef>
         <dataTypeDef>
            <name>HAModeValues</name>
            <synopsis>
               The possible values of HA modes
            </synopsis>
            <atomic>



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               <baseType>uchar</baseType>
               <specialValues>
                  <specialValue value="0">
                     <name>NoHA</name>
                     <synopsis>
                        The FE is not running in HA mode
                     </synopsis>
                  </specialValue>
                  <specialValue value="1">
                     <name>ColdStandby</name>
                     <synopsis>
                        The FE is running in HA mode cold Standby
                     </synopsis>
                  </specialValue>
                  <specialValue value="2">
                     <name>HotStandby</name>
                     <synopsis>
                        The FE is running in HA mode hot Standby
                     </synopsis>
                  </specialValue>
               </specialValues>
            </atomic>
         </dataTypeDef>
         <dataTypeDef>
            <name>CEFailoverPolicyValues</name>
            <synopsis>
               The possible values of CE failover policy
            </synopsis>
            <atomic>
               <baseType>uchar</baseType>
               <specialValues>
                  <specialValue value="0">
                     <name>CEFailoverPolicy0</name>
                     <synopsis>
                         The FE should stop functioning immediate and
                         transition to the FE OperDisable state
                     </synopsis>
                  </specialValue>
                  <specialValue value="1">
                     <name>CEFailoverPolicy1</name>
                     <synopsis>
                         The FE should continue forwarding even
                         without an associated CE for CEFTI. The
                         FE goes to FE OperDisable when the CEFTI
                         expires and no association. Requires
                         graceful restart support.
                     </synopsis>
                  </specialValue>



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               </specialValues>
            </atomic>
         </dataTypeDef>
         <dataTypeDef>
            <name>FEHACapab</name>
            <synopsis>
               The supported HA features
            </synopsis>
            <atomic>
               <baseType>uchar</baseType>
               <specialValues>
                  <specialValue value="0">
                     <name>GracefullRestart</name>
                     <synopsis>
                        The FE supports Graceful Restart
                     </synopsis>
                  </specialValue>
                  <specialValue value="1">
                     <name>HA</name>
                     <synopsis>
                        The FE supports HA
                     </synopsis>
                  </specialValue>
               </specialValues>
            </atomic>
         </dataTypeDef>
         <dataTypeDef>
            <name>CEStatusType</name>
            <synopsis>Status values. Status for each CE</synopsis>
            <atomic>
               <baseType>uchar</baseType>
               <specialValues>
                  <specialValue value="0">
                     <name>Disconnected</name>
                     <synopsis>No connection attempt with the CE yet
                     </synopsis>
                  </specialValue>
                  <specialValue value="1">
                     <name>Connected</name>
                     <synopsis>The FE connection with the CE at the TML
                        has been completed
                     </synopsis>
                  </specialValue>
                  <specialValue value="2">
                     <name>Associated</name>
                     <synopsis>The FE has associated with the CE
                     </synopsis>
                  </specialValue>



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                  <specialValue value="3">
                     <name>IsMaster</name>
                     <synopsis>The CE is the master (and associated)
                     </synopsis>
                  </specialValue>
                  <specialValue value="4">
                     <name>LostConnection</name>
                     <synopsis>The FE was associated with the CE but
                        lost the connection
                     </synopsis>
                  </specialValue>
                  <specialValue value="5">
                     <name>Unreachable</name>
                     <synopsis>The CE is deemed as unreachable by the FE
                     </synopsis>
                  </specialValue>
               </specialValues>
            </atomic>
         </dataTypeDef>
         <dataTypeDef>
            <name>StatisticsType</name>
            <synopsis>Statistics Definition</synopsis>
            <struct>
               <component componentID="1">
                  <name>RecvPackets</name>
                  <synopsis>Packets Received</synopsis>
                  <typeRef>uint64</typeRef>
               </component>
               <component componentID="2">
                  <name>RecvErrPackets</name>
                  <synopsis>Packets Received from CE with errors
                  </synopsis>
                  <typeRef>uint64</typeRef>
               </component>
               <component componentID="3">
                  <name>RecvBytes</name>
                  <synopsis>Bytes Received from CE</synopsis>
                  <typeRef>uint64</typeRef>
               </component>
               <component componentID="4">
                  <name>RecvErrBytes</name>
                  <synopsis>Bytes Received from CE in Error</synopsis>
                  <typeRef>uint64</typeRef>
               </component>
               <component componentID="5">
                  <name>TxmitPackets</name>
                  <synopsis>Packets Transmitted to CE</synopsis>
                  <typeRef>uint64</typeRef>



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               </component>
               <component componentID="6">
                  <name>TxmitErrPackets</name>
                  <synopsis>
                     Packets Transmitted to CE that incurred
                     errors
                  </synopsis>
                  <typeRef>uint64</typeRef>
               </component>
               <component componentID="7">
                  <name>TxmitBytes</name>
                  <synopsis>Bytes Transmitted to CE</synopsis>
                  <typeRef>uint64</typeRef>
               </component>
               <component componentID="8">
                  <name>TxmitErrBytes</name>
                  <synopsis>Bytes Transmitted to CE incurring errors
                  </synopsis>
                  <typeRef>uint64</typeRef>
               </component>
            </struct>
         </dataTypeDef>
         <dataTypeDef>
            <name>AllCEType</name>
            <synopsis>Table Type for AllCE component</synopsis>
            <struct>
               <component componentID="1">
                  <name>CEID</name>
                  <synopsis>ID of the CE</synopsis>
                  <typeRef>uint32</typeRef>
               </component>
               <component componentID="2">
                  <name>Statistics</name>
                  <synopsis>Statistics per CE</synopsis>
                  <typeRef>StatisticsType</typeRef>
               </component>
               <component componentID="3">
                  <name>CEStatus</name>
                  <synopsis>Status of the CE</synopsis>
                  <typeRef>CEStatusType</typeRef>
               </component>
            </struct>
         </dataTypeDef>
         <dataTypeDef>
            <name>ExtendedResultType</name>
            <synopsis>
                Possible extended result support
            </synopsis>



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            <atomic>
               <baseType>uchar</baseType>
               <rangeRestriction>
                 <allowedRange min="1" max="2"/>
               </rangeRestriction>
               <specialValues>
                  <specialValue value="1">
                     <name>EResultNotSupported</name>
                     <synopsis>
                         Extended Results are not supported
                     </synopsis>
                  </specialValue>
                  <specialValue value="2">
                     <name>EResultSupported</name>
                     <synopsis>
                         Extended Results are supported
                     </synopsis>
                  </specialValue>
               </specialValues>
            </atomic>
         </dataTypeDef>
      </dataTypeDefs>
      <LFBClassDefs>
         <LFBClassDef LFBClassID="2">
            <name>FEPO</name>
            <synopsis>
               The FE Protocol Object, with EXtended Result control
            </synopsis>
            <version>1.2</version>
            <components>
               <component componentID="1" access="read-only">
                  <name>CurrentRunningVersion</name>
                  <synopsis>Currently running ForCES version</synopsis>
                  <typeRef>uchar</typeRef>
               </component>
               <component componentID="2" access="read-only">
                  <name>FEID</name>
                  <synopsis>Unicast FEID</synopsis>
                  <typeRef>uint32</typeRef>
               </component>
               <component componentID="3" access="read-write">
                  <name>MulticastFEIDs</name>
                  <synopsis>
                     the table of all multicast IDs
                  </synopsis>
                  <array type="variable-size">
                     <typeRef>uint32</typeRef>
                  </array>



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               </component>
               <component componentID="4" access="read-write">
                  <name>CEHBPolicy</name>
                  <synopsis>
                     The CE Heartbeat Policy
                  </synopsis>
                  <typeRef>CEHBPolicyValues</typeRef>
               </component>
               <component componentID="5" access="read-write">
                  <name>CEHDI</name>
                  <synopsis>
                     The CE Heartbeat Dead Interval in millisecs
                  </synopsis>
                  <typeRef>uint32</typeRef>
               </component>
               <component componentID="6" access="read-write">
                  <name>FEHBPolicy</name>
                  <synopsis>
                     The FE Heartbeat Policy
                  </synopsis>
                  <typeRef>FEHBPolicyValues</typeRef>
               </component>
               <component componentID="7" access="read-write">
                  <name>FEHI</name>
                  <synopsis>
                     The FE Heartbeat Interval in millisecs
                  </synopsis>
                  <typeRef>uint32</typeRef>
               </component>
               <component componentID="8" access="read-write">
                  <name>CEID</name>
                  <synopsis>
                     The Primary CE this FE is associated with
                  </synopsis>
                  <typeRef>uint32</typeRef>
               </component>
               <component componentID="9" access="read-write">
                  <name>BackupCEs</name>
                  <synopsis>
                     The table of all backup CEs other than the
                     primary
                  </synopsis>
                  <array type="variable-size">
                     <typeRef>uint32</typeRef>
                  </array>
               </component>
               <component componentID="10" access="read-write">
                  <name>CEFailoverPolicy</name>



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                  <synopsis>
                     The CE Failover Policy
                  </synopsis>
                  <typeRef>CEFailoverPolicyValues</typeRef>
               </component>
               <component componentID="11" access="read-write">
                  <name>CEFTI</name>
                  <synopsis>
                     The CE Failover Timeout Interval in millisecs
                  </synopsis>
                  <typeRef>uint32</typeRef>
               </component>
               <component componentID="12" access="read-write">
                  <name>FERestartPolicy</name>
                  <synopsis>
                     The FE Restart Policy
                  </synopsis>
                  <typeRef>FERestartPolicyValues</typeRef>
               </component>
               <component componentID="13" access="read-write">
                  <name>LastCEID</name>
                  <synopsis>
                     The Primary CE this FE was last associated
                     with
                  </synopsis>
                  <typeRef>uint32</typeRef>
               </component>
               <component componentID="14" access="read-write">
                  <name>HAMode</name>
                  <synopsis>
                     The HA mode used
                  </synopsis>
                  <typeRef>HAModeValues</typeRef>
               </component>
               <component componentID="15" access="read-only">
                  <name>AllCEs</name>
                  <synopsis>The table of all CEs</synopsis>
                  <array type="variable-size">
                     <typeRef>AllCEType</typeRef>
                  </array>
                </component>
                <component componentID="16" access="read-write">
                  <name>EResultAdmin</name>
                  <synopsis>
                      Turn Extended results off or on.
                      default to off
                  </synopsis>
                  <typeRef>ExtendedResultType</typeRef>



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                  <defaultValue>1</defaultValue>
               </component>
            </components>
            <capabilities>
               <capability componentID="30">
                  <name>SupportableVersions</name>
                  <synopsis>
                     the table of ForCES versions that FE supports
                  </synopsis>
                  <array type="variable-size">
                     <typeRef>uchar</typeRef>
                  </array>
               </capability>
               <capability componentID="31">
                  <name>HACapabilities</name>
                  <synopsis>
                     the table of HA capabilities the FE supports
                  </synopsis>
                  <array type="variable-size">
                     <typeRef>FEHACapab</typeRef>
                  </array>
               </capability>
                <capability componentID="32">
                  <name>EResultCapab</name>
                  <synopsis>
                     the table of supported result capabilities
                  </synopsis>
                  <array type="variable-size">
                     <typeRef>ExtendedResultType</typeRef>
                  </array>
              </capability>
            </capabilities>
            <events baseID="61">
               <event eventID="1">
                  <name>PrimaryCEDown</name>
                  <synopsis>
                     The primary CE has changed
                  </synopsis>
                  <eventTarget>
                     <eventField>LastCEID</eventField>
                  </eventTarget>
                  <eventChanged/>
                  <eventReports>
                     <eventReport>
                        <eventField>LastCEID</eventField>
                     </eventReport>
                  </eventReports>
               </event>



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               <event eventID="2">
                  <name>PrimaryCEChanged</name>
                  <synopsis>A New primary CE has been selected
                  </synopsis>
                  <eventTarget>
                     <eventField>CEID</eventField>
                  </eventTarget>
                  <eventChanged/>
                  <eventReports>
                     <eventReport>
                        <eventField>CEID</eventField>
                     </eventReport>
                  </eventReports>
               </event>
            </events>
         </LFBClassDef>
      </LFBClassDefs>
   </LFBLibrary>


Author's Address

   Jamal Hadi Salim
   Mojatatu Networks
   Suite 400, 303 Moodie Dr.
   Ottawa, Ontario  K2H 9R4
   Canada

   Email: hadi@mojatatu.com






















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