Layer 3 Discovery and Liveness
draft-ietf-lsvr-l3dl-02

Document Type Active Internet-Draft (lsvr WG)
Last updated 2019-07-07
Replaces draft-ietf-lsvr-lsoe
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Network Working Group                                            R. Bush
Internet-Draft                        Arrcus & Internet Initiative Japan
Intended status: Standards Track                              R. Austein
Expires: January 8, 2020                                        K. Patel
                                                                  Arrcus
                                                            July 7, 2019

                     Layer 3 Discovery and Liveness
                        draft-ietf-lsvr-l3dl-02

Abstract

   In Massive Data Centers, 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.  This Layer 3 Discovery and Liveness protocol collects
   these data, which may then be 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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   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 January 8, 2020.

Bush, et al.             Expires January 8, 2020                [Page 1]
Internet-Draft       Layer 3 Discovery and Liveness            July 2019

Copyright Notice

   Copyright (c) 2019 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
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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  . . . . . . . . . . . . . . . . . . . . . . . .  10
   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 . . . . . . . . . . . . . . . . . .  26
   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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