Signaling Entropy Label Capability and Entropy Readable Label Depth Using IS-IS
draft-ietf-isis-mpls-elc-09
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Network Working Group X. Xu
Internet-Draft Alibaba Inc
Intended status: Standards Track S. Kini
Expires: April 6, 2020
P. Psenak
C. Filsfils
S. Litkowski
Cisco
October 4, 2019
Signaling Entropy Label Capability and Entropy Readable Label Depth
Using IS-IS
draft-ietf-isis-mpls-elc-09
Abstract
Multiprotocol Label Switching (MPLS) has defined a mechanism to load-
balance traffic flows using Entropy Labels (EL). An ingress Label
Switching Router (LSR) cannot insert ELs for packets going into a
given Label Switched Path (LSP) unless an egress LSR has indicated
via signaling that it has the capability to process ELs, referred to
as Entropy Label Capability (ELC), on that tunnel. In addition, it
would be useful for ingress LSRs to know each LSR's capability for
reading the maximum label stack depth and performing EL-based load-
balancing, referred to as Entropy Readable Label Depth (ERLD). This
document defines a mechanism to signal these two capabilities using
IS-IS. These mechanisms are particularly useful, where label
advertisements are done via protocols like IS-IS.
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 April 6, 2020.
Xu, et al. Expires April 6, 2020 [Page 1]
Internet-Draft Signaling ELC and ERLD using IS-IS October 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
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described in the Simplified BSD License.
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 3
3. Advertising ELC Using IS-IS . . . . . . . . . . . . . . . . . 3
4. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 4
5. Advertising ERLD Using IS-IS . . . . . . . . . . . . . . . . 4
6. Signaling ELC and ERLD in BGP-LS . . . . . . . . . . . . . . 4
7. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 5
8. Security Considerations . . . . . . . . . . . . . . . . . . . 5
9. References . . . . . . . . . . . . . . . . . . . . . . . . . 5
9.1. Normative References . . . . . . . . . . . . . . . . . . 5
9.2. Informative References . . . . . . . . . . . . . . . . . 6
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 7
1. Introduction
[RFC6790] describes a method to load-balance Multiprotocol Label
Switching (MPLS) traffic flows using Entropy Labels (EL). "The Use
of Entropy Labels in MPLS Forwarding" [RFC6790] introduces the
concept of Entropy Label Capability (ELC) and defines the signalings
of this capability via MPLS signaling protocols. Recently,
mechanisms have been defined to signal labels via link-state Interior
Gateway Protocols (IGP) such as IS-IS
[I-D.ietf-isis-segment-routing-extensions]. In such scenarios, the
defined signaling mechanisms are inadequate. This draft defines a
mechanism to signal the ELC using IS-IS. This mechanism is useful
when the label advertisement is also done via IS-IS.
In addition, in the cases where LSPs are used for whatever reasons
(e.g., SR-MPLS [I-D.ietf-spring-segment-routing-mpls]), it would be
useful for ingress LSRs to know each intermediate LSR's capability of
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