Hi Madhukar,
- you defined Opaque-Adj-SID sub-TLV is an optional sub-TLV of Extended
Link TLV in case of OSPF and one of the IS-Neighbor TLVs in case of
ISIS. The parent TLVs in all cases carry the neighbor identifier.
Repeating the Remote POG Router-ID/System ID in Opaque-Adj-SID sub-TLV
looks redundant.
- Is the "paths through the optical transport domain" always between
adjacent POGs? Would not you find it useful to advertise a "path"
between non adjacent POG nodes?
- Existing SR architecture includes the definition of Binding SID and
there are extensions for IGPs to advertise it. The SID/Label Binding
Sub-TLV is used to advertise a SID/Label mapping for a "path" to the
prefix. It looks to me there is an overlap between the new
Opaque-Adj-SID sub-TLV and existing SID/Label Binding Sub-TLV. Both of
them advertise a "binding label" for a "path". Binding Sub-TLV talks
about a path to a prefix, but given that the prefix can represent a
"Router-ID" of the remote node, it can be used to advertise the path to
a node.
- Section 4 of the draft says: "The opaque adjacency segment can also
optionally be announced with a set of attributes that characterizes the
path". The Opaque-Adj-SID sub-TLV encoding does not provide for
additional attributes. SID/Label Binding Sub-TLV supports nested
sub-TLVs, which allows you to advertise path path attributes.
I wonder whether existing Binding Sub-TLV with new sub-TLVs could be
used for the Packet-Optical integration, rather then defining a new
sub-TLV of a similar kind.
thanks,
Peter
On 3/23/16 05:17 , Madhukar Anand wrote:
Hi all,
The following draft talks about connecting packet and optical networks using
segment routing as a common control plane. This is an attempt towards
packet-optical integration. Please review and let us know of any comments.
https://www.ietf.org/internet-drafts/draft-anand-spring-poi-sr-00.txt
Best regards,
Madhukar, Sanjoy and Ramesh
-----Original Message-----
From: [email protected] [mailto:[email protected]]
Sent: Sunday, March 20, 2016 6:32 PM
To: Madhukar Anand <[email protected]>; Sanjoy Bardhan <[email protected]>
Subject: New Version Notification for draft-anand-spring-poi-sr-00.txt
A new version of I-D, draft-anand-spring-poi-sr-00.txt has been successfully
submitted by Madhukar Anand and posted to the IETF repository.
Name: draft-anand-spring-poi-sr
Revision: 00
Title: Packet-Optical Integration in Segment Routing
Document date: 2016-03-20
Group: Individual Submission
Pages: 15
URL:
https://www.ietf.org/internet-drafts/draft-anand-spring-poi-sr-00.txt
Status: https://datatracker.ietf.org/doc/draft-anand-spring-poi-sr/
Htmlized: https://tools.ietf.org/html/draft-anand-spring-poi-sr-00
Abstract:
This document illustrates a way to integrate a new class of nodes and
links in segment routing to represent networks in an opaque way for
further extensibility of the link-state protocols that help with
segment routing. An instance of the opaque definition would be
optical networks that are typically transport centric. In the IP
centric network, this will help in defining a common control protocol
for packet optical integration that will include optical paths as
opaque 'segments' or sub-paths as an augmentation to the defined
extensions of segment routing. This opaque option defines a general
mechanism to allow for future extensibility of segment routing.
Please note that it may take a couple of minutes from the time of submission
until the htmlized version and diff are available at tools.ietf.org.
The IETF Secretariat
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