IS-IS TE Attributes per application
draft-ietf-isis-te-app-11
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Active Internet-Draft (lsr WG)
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Last updated |
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2020-03-06
(latest revision 2020-02-27)
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draft-ginsberg-isis-te-app
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IETF
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Intended RFC status |
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Proposed Standard
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pdf
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bibtex
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WG state
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Submitted to IESG for Publication
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Document shepherd |
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Acee Lindem
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Shepherd write-up |
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Show
(last changed 2020-01-10)
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IESG state |
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AD Evaluation::Revised I-D Needed
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Consensus Boilerplate |
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Yes
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Telechat date |
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Responsible AD |
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Alvaro Retana
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Send notices to |
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Acee Lindem <acee@cisco.com>, aretana.ietf@gmail.com
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Networking Working Group L. Ginsberg
Internet-Draft P. Psenak
Intended status: Standards Track Cisco Systems
Expires: August 30, 2020 S. Previdi
Huawei
W. Henderickx
Nokia
J. Drake
Juniper Networks
February 27, 2020
IS-IS TE Attributes per application
draft-ietf-isis-te-app-11
Abstract
Existing traffic engineering related link attribute advertisements
have been defined and are used in RSVP-TE deployments. Since the
original RSVP-TE use case was defined, additional applications (e.g.,
Segment Routing Traffic Engineering, Loop Free Alternate) have been
defined which also make use of the link attribute advertisements. In
cases where multiple applications wish to make use of these link
attributes the current advertisements do not support application
specific values for a given attribute nor do they support indication
of which applications are using the advertised value for a given
link. This document introduces new link attribute advertisements
which address both of these shortcomings.
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/.
Ginsberg, et al. Expires August 30, 2020 [Page 1]
Internet-Draft draft-ietf-isis-te-app February 2020
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 August 30, 2020.
Copyright Notice
Copyright (c) 2020 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. Requirements Discussion . . . . . . . . . . . . . . . . . . . 4
3. Legacy Advertisements . . . . . . . . . . . . . . . . . . . . 4
3.1. Legacy sub-TLVs . . . . . . . . . . . . . . . . . . . . . 5
3.2. Legacy SRLG Advertisements . . . . . . . . . . . . . . . 5
4. Advertising Application Specific Link Attributes . . . . . . 6
4.1. Application Identifier Bit Mask . . . . . . . . . . . . . 6
4.2. Application Specific Link Attributes sub-TLV . . . . . . 8
4.2.1. Special Considerations for Maximum Link Bandwidth . . 9
4.2.2. Special Considerations for Reservable/Unreserved
Bandwidth . . . . . . . . . . . . . . . . . . . . . . 10
4.2.3. Considerations for Extended TE Metrics . . . . . . . 10
4.3. Application Specific SRLG TLV . . . . . . . . . . . . . . 10
5. Attribute Advertisements and Enablement . . . . . . . . . . . 11
6. Deployment Considerations . . . . . . . . . . . . . . . . . . 12
6.1. Use of Legacy Advertisements . . . . . . . . . . . . . . 12
6.2. Use of Zero Length Application Identifier Bit Masks . . . 13
6.3. Interoperability, Backwards Compatibility and Migration
Concerns . . . . . . . . . . . . . . . . . . . . . . . . 14
6.3.1. Multiple Applications: Common Attributes with RSVP-
TE . . . . . . . . . . . . . . . . . . . . . . . . . 14
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