IS-IS TE Attributes per application
draft-ginsberg-isis-te-app-03
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2017-08-17
(latest revision 2017-06-20)
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Networking Working Group L. Ginsberg
Internet-Draft P. Psenak
Intended status: Standards Track Cisco Systems
Expires: December 22, 2017 S. Previdi
Individual
W. Henderickx
Nokia
June 20, 2017
IS-IS TE Attributes per application
draft-ginsberg-isis-te-app-03.txt
Abstract
Existing traffic engineering related link attribute advertisements
have been defined and are used in RSVP-TE deployments. 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 draft introduces new link attribute advertisements which address
both of these shortcomings. It also discusses backwards
compatibility issues and how to minimize duplicate advertisements in
the presence of routers which do not support the extensions defined
in this document.
Requirements Language
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in RFC 2119 [RFC2119].
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 http://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."
Ginsberg, et al. Expires December 22, 2017 [Page 1]
Internet-Draft draft-ginsberg-isis-te-app June 2017
This Internet-Draft will expire on December 22, 2017.
Copyright Notice
Copyright (c) 2017 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
(http://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 . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Requirements Discussion . . . . . . . . . . . . . . . . . . . 3
3. Legacy Advertisements . . . . . . . . . . . . . . . . . . . . 4
3.1. Legacy sub-TLVs . . . . . . . . . . . . . . . . . . . . . 4
3.2. Legacy SRLG Advertisements . . . . . . . . . . . . . . . 5
4. Advertising Application Specific Link Attributes . . . . . . 5
4.1. Application Identifier Bit Mask . . . . . . . . . . . . . 5
4.2. Application Specific Link Attributes sub-TLV . . . . . . 7
4.3. Application Specific SRLG TLV . . . . . . . . . . . . . . 8
5. Deployment Considerations . . . . . . . . . . . . . . . . . . 9
6. Attribute Advertisements and Enablement . . . . . . . . . . . 10
7. Interoperability, Backwards Compatibility and Migration
Concerns . . . . . . . . . . . . . . . . . . . . . . . . . . 10
7.1. RSVP-TE only deployments . . . . . . . . . . . . . . . . 11
7.2. Multiple Applications: Common Attributes with RSVP-TE . 11
7.3. Multiple Applications: All Attributes Not Shared w RSVP-
TE . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
7.4. Deprecating legacy advertisements . . . . . . . . . . . . 11
8. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 12
9. Security Considerations . . . . . . . . . . . . . . . . . . . 13
10. Acknowledgements . . . . . . . . . . . . . . . . . . . . . . 13
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