[Teas] RFC 8390 on RSVP-TE Path Diversity Using Exclude Route

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        RFC 8390

        Title:      RSVP-TE Path Diversity Using Exclude Route 
        Author:     Z. Ali, Ed.,
                    G. Swallow, Ed.,
                    F. Zhang, Ed.,
                    D. Beller, Ed.
        Status:     Standards Track
        Stream:     IETF
        Date:       July 2018
        Mailbox:    [e-mail], 
                    [e-mail], 
                    [e-mail],
                    [e-mail]
        Pages:      26
        Characters: 59106
        Updates:    RFC 4874

        I-D Tag:    draft-ietf-teas-lsp-diversity-10.txt

        URL:        https://www.rfc-editor.org/info/rfc8390

        DOI:        10.17487/RFC8390

RSVP-TE provides support for the communication of exclusion
information during Label Switched Path (LSP) setup.  A typical LSP
diversity use case is for protection, where two LSPs should follow
different paths through the network in order to avoid single points
of failure, thus greatly improving service availability.  This
document specifies an approach that can be used for network scenarios
where the full path(s) is not necessarily known by use of an abstract
identifier for the path.  Three types of abstract identifiers are
specified: client based, Path Computation Element (PCE) based, and
network based.  This document specifies two new diversity subobjects
for the RSVP eXclude Route Object (XRO) and the Explicit Exclusion
Route Subobject (EXRS).

For the protection use case, LSPs are typically created at a slow
rate and exist for a long time so that it is reasonable to assume
that a given (reference) path currently existing (with a well-known
identifier) will continue to exist and can be used as a reference
when creating the new diverse path.  Re-routing of the existing
(reference) LSP, before the new path is established, is not
considered.

This document is a product of the Traffic Engineering Architecture and Signaling Working Group of the IETF.

This is now a Proposed Standard.

STANDARDS TRACK: This document specifies an Internet Standards Track
protocol for the Internet community, and requests discussion and suggestions
for improvements.  Please refer to the current edition of the Official
Internet Protocol Standards (https://www.rfc-editor.org/standards) for the 
standardization state and status of this protocol.  Distribution of this 
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