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Versions: 00 01 02 03                                                   
Network Working Group                                             D. Liu
Internet-Draft                                                J. Halpern
Intended status: Informational                                  C. Zhang
Expires: January 1, 2022                                        Ericsson
                                                           June 30, 2021


Interface Stack Table Definition for Point to Point (P2P) Interface over
                                  LAN
                      draft-liu-lsr-p2poverlan-03

Abstract

   In [RFC5309] defines the Point to Point (P2P) circuit type is one of
   the mainly used circuit types in link state routing protocol, and
   highlights it is important to identify the correct circuit type when
   forming adjacencies, flooding link state database packets, and
   monitor the link state.

   Point to Point (P2P) Interface over LAN ifType value is assigned by
   IANA experts review.  This document provides an example of the
   ifStack for Point to Point (P2P) Interface over LAN ifType to
   facilitate operational control, maintenance and statistics.

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
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   This Internet-Draft will expire on January 1, 2022.

Copyright Notice

   Copyright (c) 2021 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



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   (https://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
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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Requirements Language . . . . . . . . . . . . . . . . . . . .   2
   3.  Interface Stack Table for Point to Point (P2P) Interface Type   3
   4.  Security Considerations . . . . . . . . . . . . . . . . . . .   4
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   4
   6.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   4
     6.1.  Normative references  . . . . . . . . . . . . . . . . . .   4
     6.2.  Informative References  . . . . . . . . . . . . . . . . .   5
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   5

1.  Introduction

   The assignment of a value (303, available at
   https://www.iana.org/assignments/smi-numbers/smi-numbers.xhtml#smi-
   numbers-5) to p2pOverLan ifType was made by expert review.  To
   simplify configuration and operational control, it is helpful to
   represent the fact that an interface is to be considered a Point to
   Point (P2P) Interface over LAN type explicitly in the interface
   stack.  This enables, for example, routing protocols to automatically
   inherit the correct operating mode from interface stack without
   further configuration(Not need to explicitly configure Point to Point
   Interface in routing protocols).

   So it is helpful to map Point to Point (P2P) Interface over LAN type
   in interface management stack table.  And if no entry specify Point
   to Point (P2P) Interface lower layer, the management will suffer
   since lose the ability to get to the lower layer specific management
   properties via many tools.

2.  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] [RFC8174].







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3.  Interface Stack Table for Point to Point (P2P) Interface Type

   If the device implements the IF-MIB [RFC2863], each entry in the
   "/interfaces/interface" list (in "Interface Management YANG") in the
   operational state is typically mapped to one ifEntry is required in
   [RFC8343], therefore Point to Point (P2P) Interface over LAN type
   should also fully map to one ifEntry by defining the "ifStackTable"
   ("higher-layer-if" and "lower-layer-if").

   Point to Point (P2P) interface higher layer should be network layer
   "ipForward" (defined in IANA) to run routing protocol, Point to Point
   (P2P) interface lower layer is link data layer "ethernetCsmacd"
   (defined in IANA).

   Point to Point (P2P) interface type ifStackTable can be defined along
   the lines of following example which complies with [RFC8343]:

                    <interface>
                      <name>isis_int</name>
                      <type>ianaift:ipForward</type>
                    </interface>

                    <interface>
                      <name>eth1</name>
                      <type>ianaift:ethernetCsmacd</type>
                    </interface>

                    <interface>
                      <name>p2p</name>
                      <type>ianaift:p2pOverLan</type>
                      <higher-layer-if>isis_int</higher-layer-if>
                      <lower-layer-if>eth1</lower-layer-if>
                      <enabled>false</enabled>
                      <admin-status>down</admin-status>
                      <oper-status>down</oper-status>
                      <statistics>
                        <discontinuity-time>
                          2021-04-01T03:00:00+00:00
                        </discontinuity-time>
                        <!-- counters now shown here -->
                      </statistics>
                    </interface>

                                 Figure 1







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4.  Security Considerations

   The interface stack table specified in this document is read-only.
   Read operation to this table without complete protection shouldn't
   have a negative effect on network operations.

5.  IANA Considerations

   In the Interface Types registry, IANA has previously assigned a value
   of 303 for p2pOverLan with a reference of [RFC5309], as shown in
   following table (available at https://www.iana.org/assignments/smi-
   numbers/smi-numbers.xhtml#smi-numbers-5).  IANA is requested to amend
   the reference to point to this document and to make a similar
   amendment in the YANG iana-if-type module [RFC7224] which currently
   points to [RFC8561], as this document explains how the ifType is to
   be used.

             +=========+==================+==================+
             | Decimal |    Name          |    references    |
             +=========+==================+==================+
             |  303    |  p2pOverLan      |      RFC5309     |
             +---------+------------------+------------------+

                                 Figure 2

6.  References

6.1.  Normative references

   [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
              Requirement Levels", BCP 14, RFC 2119,
              DOI 10.17487/RFC2119, March 1997,
              <https://www.rfc-editor.org/info/rfc2119>.

   [RFC2863]  McCloghrie, K. and F. Kastenholz, "The Interfaces Group
              MIB", RFC 2863, DOI 10.17487/RFC2863, June 2000,
              <https://www.rfc-editor.org/info/rfc2863>.

   [RFC5309]  Zinin, A. and N. Shen, "Point-to-Point Operation over LAN
              in Link State Routing Protocols", RFC 5309,
              DOI 10.17487/RFC5309, October 2008,
              <https://www.rfc-editor.org/info/rfc5309>.

   [RFC7224]  Bjorklund, M., "IANA Interface Type YANG Module",
              RFC 7224, DOI 10.17487/RFC7224, May 2014,
              <https://www.rfc-editor.org/info/rfc7224>.





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   [RFC8174]  Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC
              2119 Key Words", RFC 8174, IETF RFC 8174,
              DOI 10.17487/RFC8174, May 2017,
              <https://www.rfc-editor.org/info/rfc8174>.

   [RFC8343]  Bjorklund, M., "A YANG Data Model for Interface
              Management", RFC 8343, DOI 10.17487/RFC8343, March 2018,
              <https://www.rfc-editor.org/info/rfc8343>.

   [RFC8561]  Ahlberg, J., Ye, M., Li, X., Spreafico, D., and M.
              Ahlberg, "A YANG Data Model for Microwave Radio Link",
              RFC 8561, DOI 10.17487/RFC8561, June 2019,
              <https://www.rfc-editor.org/info/rfc8561>.

6.2.  Informative References

   [RFC6991]  Schoenwaelder, J., "Common YANG Data Types", RFC 6991,
              DOI 10.17487/RFC6991, June 2011,
              <https://www.rfc-editor.org/info/rfc6991>.

   [RFC8340]  Bjorklund, M. and L. Berger, "YANG Tree Diagrams",
              BCP 215, RFC 8340, DOI 10.17487/RFC8340, March 2018,
              <https://www.rfc-editor.org/info/rfc8340>.

Authors' Addresses

   Daiying Liu
   Ericsson
   No.5 Lize East street
   Beijing  100102
   China

   Email: harold.liu@ericsson.com


   Joel Halpern
   Ericsson

   Email: joel.halpern@ericsson.com


   Congjie Zhang
   Ericsson

   Email: congjie.zhang@ericsson.com






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