Layer 3 Discovery and Liveness
draft-ietf-lsvr-l3dl-06
Network Working Group R. Bush
Internet-Draft Arrcus & Internet Initiative Japan
Intended status: Standards Track R. Austein
Expires: January 30, 2021 K. Patel
Arrcus
July 29, 2020
Layer 3 Discovery and Liveness
draft-ietf-lsvr-l3dl-06
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 neighbor IP
addressing, logical link IP encapsulation abilities, 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
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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 30, 2021.
Bush, et al. Expires January 30, 2021 [Page 1]
Internet-Draft Layer 3 Discovery and Liveness July 2020
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 4
3. Background . . . . . . . . . . . . . . . . . . . . . . . . . 5
4. Top Level Overview . . . . . . . . . . . . . . . . . . . . . 6
5. Inter-Link Protocol Overview . . . . . . . . . . . . . . . . 7
5.1. L3DL Ladder Diagram . . . . . . . . . . . . . . . . . . . 7
6. Transport Layer . . . . . . . . . . . . . . . . . . . . . . . 9
7. The Checksum . . . . . . . . . . . . . . . . . . . . . . . . 11
8. TLV PDUs . . . . . . . . . . . . . . . . . . . . . . . . . . 13
9. Logical Link Endpoint Identifier . . . . . . . . . . . . . . 14
10. HELLO . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
11. OPEN . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
12. ACK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
12.1. Retransmission . . . . . . . . . . . . . . . . . . . . . 20
13. The Encapsulations . . . . . . . . . . . . . . . . . . . . . 20
13.1. The Encapsulation PDU Skeleton . . . . . . . . . . . . . 21
13.2. Encapsulaion Flags . . . . . . . . . . . . . . . . . . . 22
13.3. IPv4 Encapsulation . . . . . . . . . . . . . . . . . . . 22
13.4. IPv6 Encapsulation . . . . . . . . . . . . . . . . . . . 23
13.5. MPLS Label List . . . . . . . . . . . . . . . . . . . . 24
13.6. MPLS IPv4 Encapsulation . . . . . . . . . . . . . . . . 24
13.7. MPLS IPv6 Encapsulation . . . . . . . . . . . . . . . . 25
14. VENDOR - Vendor Extensions . . . . . . . . . . . . . . . . . 25
15. KEEPALIVE - Layer 2 Liveness . . . . . . . . . . . . . . . . 26
16. Layers 2.5 and 3 Liveness . . . . . . . . . . . . . . . . . . 27
17. The North/South Protocol . . . . . . . . . . . . . . . . . . 27
17.1. Use BGP-LS as Much as Possible . . . . . . . . . . . . . 28
17.2. Extensions to BGP-LS . . . . . . . . . . . . . . . . . . 28
18. Discussion . . . . . . . . . . . . . . . . . . . . . . . . . 28
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