Layer 3 Discovery and Liveness
draft-ietf-lsvr-l3dl-03
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2019-11-02
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Network Working Group R. Bush
Internet-Draft Arrcus & Internet Initiative Japan
Intended status: Standards Track R. Austein
Expires: May 5, 2020 K. Patel
Arrcus
November 2, 2019
Layer 3 Discovery and Liveness
draft-ietf-lsvr-l3dl-03
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
Task Force (IETF). Note that other groups may also distribute
working documents as Internet-Drafts. The list of current Internet-
Drafts is at https://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 May 5, 2020.
Bush, et al. Expires May 5, 2020 [Page 1]
Internet-Draft Layer 3 Discovery and Liveness November 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
Provisions Relating to IETF Documents
(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
to this document. Code Components extracted from this document must
include Simplified BSD License text as described in Section 4.e of
the Trust Legal Provisions and are provided without warranty as
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 . . . . . . . . . . . . . . . . 7
5.1. L3DL Ladder Diagram . . . . . . . . . . . . . . . . . . . 7
6. Transport Layer . . . . . . . . . . . . . . . . . . . . . . . 9
7. The Checksum . . . . . . . . . . . . . . . . . . . . . . . . 10
8. TLV PDUs . . . . . . . . . . . . . . . . . . . . . . . . . . 12
9. Logical Link Endpoint Identifier . . . . . . . . . . . . . . 13
10. HELLO . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
11. OPEN . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
12. ACK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
12.1. Retransmission . . . . . . . . . . . . . . . . . . . . . 19
13. The Encapsulations . . . . . . . . . . . . . . . . . . . . . 19
13.1. The Encapsulation PDU Skeleton . . . . . . . . . . . . . 20
13.2. Encapsulaion Flags . . . . . . . . . . . . . . . . . . . 21
13.3. IPv4 Encapsulation . . . . . . . . . . . . . . . . . . . 21
13.4. IPv6 Encapsulation . . . . . . . . . . . . . . . . . . . 22
13.5. MPLS Label List . . . . . . . . . . . . . . . . . . . . 23
13.6. MPLS IPv4 Encapsulation . . . . . . . . . . . . . . . . 23
13.7. MPLS IPv6 Encapsulation . . . . . . . . . . . . . . . . 24
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 . . . . . . . . . . . . . 27
17.2. Extensions to BGP-LS . . . . . . . . . . . . . . . . . . 27
18. Discussion . . . . . . . . . . . . . . . . . . . . . . . . . 27
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