Multi-purpose Special Purpose Label for Forwarding Actions
draft-kompella-mpls-mspl4fa-00
MPLS WG K. Kompella
Internet-Draft V. Beeram
Intended status: Standards Track T. Saad
Expires: August 26, 2021 Juniper Networks
I. Meilik
Broadcom
February 22, 2021
Multi-purpose Special Purpose Label for Forwarding Actions
draft-kompella-mpls-mspl4fa-00
Abstract
A Slice Selector is packet metadata that dictates the packet's
forwarding handling in order to conform to its slice requirements.
There are multiple proposals for carrying slice selectors in MPLS
networks. One of the more practical proposals is the "Global
Identifier for Slice Selector" (GISS). Global uniqueness requires
the GISS label be identified as such, via a special purpose label
(ideally a base special purpose label (bSPL)). However, bSPLs are a
precious commodity, and there are many requests for them. This
document serves two purposes: to define a bSPL for carrying a GISS,
and to show how this bSPL can consolidate many current requests for
special purpose labels while carrying associated data compactly and
efficiently.
Status of This Memo
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This Internet-Draft will expire on August 26, 2021.
Kompella, et al. Expires August 26, 2021 [Page 1]
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
1.1. Terminology . . . . . . . . . . . . . . . . . . . . . . . 3
1.2. Slice Selector . . . . . . . . . . . . . . . . . . . . . 3
2. Multi-purpose bSPL: the Forwarding Actions Indicator . . . . 3
2.1. The FAI bSPL . . . . . . . . . . . . . . . . . . . . . . 4
3. Issues to be Resolved . . . . . . . . . . . . . . . . . . . . 7
3.1. Preventing FAI From Reaching Top of Stack . . . . . . . . 7
3.2. Repeating the FAI at "Readable Stack Depth" . . . . . . . 8
3.3. First Nibble Issues . . . . . . . . . . . . . . . . . . . 8
4. Contributors . . . . . . . . . . . . . . . . . . . . . . . . 8
5. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 8
6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 8
7. Security Considerations . . . . . . . . . . . . . . . . . . . 9
8. References . . . . . . . . . . . . . . . . . . . . . . . . . 9
8.1. Normative References . . . . . . . . . . . . . . . . . . 9
8.2. Informative References . . . . . . . . . . . . . . . . . 10
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 10
1. Introduction
Network slicing is an important ongoing effort both for network
design, as well as for standardization, in particular at the IETF
[I-D.nsdt-teas-ns-framework]. A key issue is identifying which slice
a packet belongs to, by means of a "slice selector" carried in the
packet header. [I-D.bestbar-teas-ns-packet] describes several such
methods for MPLS networks, of which the Global Identifier for Slice
Selector (GISS) is one of the more practical solutions. This
document shows how to realize the GISS using a base special purpose
label (bSPL).
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