Entropy label for SPRING tunnels
draft-ietf-mpls-spring-entropy-label-12
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Active Internet-Draft (mpls WG)
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Last updated |
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2019-07-09
(latest revision 2018-07-16)
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draft-kini-mpls-spring-entropy-label
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IETF
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Proposed Standard
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Submitted to IESG for Publication
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Document shepherd |
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Loa Andersson
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(last changed 2018-07-04)
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Yes
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Responsible AD |
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Deborah Brungard
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draft-ietf-mpls-spring-entropy-label@ietf.org, mpls@ietf.org, db3546@att.com
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REF |
Network Working Group S. Kini
Internet-Draft
Intended status: Standards Track K. Kompella
Expires: January 17, 2019 Juniper
S. Sivabalan
Cisco
S. Litkowski
Orange
R. Shakir
Google
J. Tantsura
July 16, 2018
Entropy label for SPRING tunnels
draft-ietf-mpls-spring-entropy-label-12
Abstract
Segment Routing (SR) leverages the source routing paradigm. A node
steers a packet through an ordered list of instructions, called
segments. Segment Routing can be applied to the Multi Protocol Label
Switching (MPLS) data plane. Entropy label (EL) is a technique used
in MPLS to improve load-balancing. This document examines and
describes how ELs are to be applied to Segment Routing MPLS.
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 January 17, 2019.
Copyright Notice
Copyright (c) 2018 IETF Trust and the persons identified as the
document authors. All rights reserved.
Kini, et al. Expires January 17, 2019 [Page 1]
Internet-Draft Entropy Labels for SPRING tunnels July 2018
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
1.1. Requirements Language . . . . . . . . . . . . . . . . . . 4
2. Abbreviations and Terminology . . . . . . . . . . . . . . . . 4
3. Use-case requiring multipath load-balancing . . . . . . . . . 5
4. Entropy Readable Label Depth . . . . . . . . . . . . . . . . 6
5. Maximum SID Depth . . . . . . . . . . . . . . . . . . . . . . 8
6. LSP stitching using the Binding-SID . . . . . . . . . . . . . 10
7. Insertion of entropy labels for SPRING path . . . . . . . . . 11
7.1. Overview . . . . . . . . . . . . . . . . . . . . . . . . 11
7.1.1. Example 1 where the ingress node has a sufficient MSD 12
7.1.2. Example 2 where the ingress node does not have a
sufficient MSD . . . . . . . . . . . . . . . . . . . 13
7.2. Considerations for the placement of entropy labels . . . 14
7.2.1. ERLD value . . . . . . . . . . . . . . . . . . . . . 15
7.2.2. Segment type . . . . . . . . . . . . . . . . . . . . 16
7.2.2.1. Node-SID . . . . . . . . . . . . . . . . . . . . 16
7.2.2.2. Adjacency-set SID . . . . . . . . . . . . . . . . 17
7.2.2.3. Adjacency-SID representing a single IP link . . . 17
7.2.2.4. Adjacency-SID representing a single link within
an L2 bundle . . . . . . . . . . . . . . . . . . 17
7.2.2.5. Adjacency-SID representing an L2 bundle . . . . . 17
7.2.3. Maximizing number of LSRs that will load-balance . . 18
7.2.4. Preference for a part of the path . . . . . . . . . . 18
7.2.5. Combining criteria . . . . . . . . . . . . . . . . . 18
8. A simple example algorithm . . . . . . . . . . . . . . . . . 18
9. Deployment Considerations . . . . . . . . . . . . . . . . . . 19
10. Options considered . . . . . . . . . . . . . . . . . . . . . 20
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