Layer 3 Discovery and Liveness
draft-ietf-lsvr-l3dl-01

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Document Type Active Internet-Draft (lsvr WG)
Last updated 2019-06-12 (latest revision 2019-04-24)
Replaces draft-ietf-lsvr-lsoe
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Network Working Group                                            R. Bush
Internet-Draft                                              Arrcus & IIJ
Intended status: Standards Track                              R. Austein
Expires: December 14, 2019                                      K. Patel
                                                                  Arrcus
                                                           June 12, 2019

                     Layer 3 Discovery and Liveness
                        draft-ietf-lsvr-l3dl-01

Abstract

   In Massive Data Centers (MDCs), BGP-SPF and similar routing protocols
   are used to build topology and reachability databases.  These
   protocols need to discover IP Layer 3 attributes of links, such as
   logical link IP encapsulation abilities, IP neighbor address
   discovery, and link liveness.  The Layer 3 Discovery and Liveness
   protocol specified in this document collects these data, which are
   then disseminated using BGP-SPF and similar protocols.

Requirements Language

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
   "OPTIONAL" in this document are to be interpreted as described in
   BCP 14 [RFC2119] [RFC8174] when, and only when, they appear in all
   capitals, as shown here.

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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   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on December 14, 2019.

Bush, et al.            Expires December 14, 2019               [Page 1]
Internet-Draft       Layer 3 Discovery and Liveness            June 2019

Copyright Notice

   Copyright (c) 2019 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   4
   3.  Background  . . . . . . . . . . . . . . . . . . . . . . . . .   5
   4.  Top Level Overview  . . . . . . . . . . . . . . . . . . . . .   5
   5.  Inter-Link Protocol Overview  . . . . . . . . . . . . . . . .   6
     5.1.  L3DL Ladder Diagram . . . . . . . . . . . . . . . . . . .   7
   6.  Transport Layer . . . . . . . . . . . . . . . . . . . . . . .   8
   7.  The Checksum  . . . . . . . . . . . . . . . . . . . . . . . .   9
   8.  TLV PDUs  . . . . . . . . . . . . . . . . . . . . . . . . . .  12
   9.  Logical Link Endpoint Identifier  . . . . . . . . . . . . . .  13
   10. HELLO . . . . . . . . . . . . . . . . . . . . . . . . . . . .  14
   11. OPEN  . . . . . . . . . . . . . . . . . . . . . . . . . . . .  15
   12. ACK . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  17
     12.1.  Retransmission . . . . . . . . . . . . . . . . . . . . .  18
   13. The Encapsulations  . . . . . . . . . . . . . . . . . . . . .  18
     13.1.  The Encapsulation PDU Skeleton . . . . . . . . . . . . .  19
     13.2.  Encapsulaion Flags . . . . . . . . . . . . . . . . . . .  20
     13.3.  IPv4 Encapsulation . . . . . . . . . . . . . . . . . . .  21
     13.4.  IPv6 Encapsulation . . . . . . . . . . . . . . . . . . .  21
     13.5.  MPLS Label List  . . . . . . . . . . . . . . . . . . . .  22
     13.6.  MPLS IPv4 Encapsulation  . . . . . . . . . . . . . . . .  22
     13.7.  MPLS IPv6 Encapsulation  . . . . . . . . . . . . . . . .  23
   14. VENDOR - Vendor Extensions  . . . . . . . . . . . . . . . . .  24
   15. KEEPALIVE - Layer 2 Liveness  . . . . . . . . . . . . . . . .  25
   16. Layers 2.5 and 3 Liveness . . . . . . . . . . . . . . . . . .  25
   17. The North/South Protocol  . . . . . . . . . . . . . . . . . .  26
     17.1.  Use BGP-LS as Much as Possible . . . . . . . . . . . . .  26
     17.2.  Extensions to BGP-LS . . . . . . . . . . . . . . . . . .  26
   18. Discussion  . . . . . . . . . . . . . . . . . . . . . . . . .  27
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