No, there probably is no IETF reference. The techniques I can think of
do not have interoperability issues, and therefore are not IETF
standards. They are just operations on a controller, where the
controller manages resource allocations. These were discussed in slide
presentations in the early work on SR.
And I am sure there are other ways that I do not know of.
Yours,
Joel
On 5/24/2020 10:54 PM, Dongjie (Jimmy) wrote:
Hi Joel,
Could you provide some reference in IETF to the "existing ways to do resource
reservation with SR" you mentioned?
Regarding the term isolation, my suggestion is to keep that generic discussion in TEAS.
In the context of this draft, as described in the draft and mails, the meaning is
"allocating dedicated network resources", i.e. resource isolation, the
description could be clarified further.
Best regards,
Jie
-----Original Message-----
From: Joel Halpern Direct [mailto:jmh.dir...@joelhalpern.com]
Sent: Thursday, May 21, 2020 10:08 PM
To: Dongjie (Jimmy) <jie.d...@huawei.com>; qinfengwei
<qinfeng...@chinamobile.com>; 'SPRING WG' <spring@ietf.org>
Cc: draft-dong-spring-sr-for-enhanced-...@ietf.org
Subject: Re: [spring] 答复: Progressing
draft-dong-spring-sr-for-enhanced-vpn to enable SR with resource
management
Part of my concern is that the document claims that this technique is
necessary to use resource reservation with segment routing. Given that we
know there are existing ways people do use resource reservation with SR, it is
not necessary.
The term "isolation" has been extensively debated in the traffic engineering
working group, and the proponents have not been able to make a clear case
for it.
Yours,
Joel
On 5/21/2020 9:07 AM, Dongjie (Jimmy) wrote:
Hi Joel,
Thanks for your comment.
In this document, isolation means resource isolation, more specifically, a
set of dedicated network resources are allocated on a group of network
nodes and links, and SR SIDs are used to represent the allocated network
resources. As mentioned by Aijun, this is described in section 5, it could be
clarified earlier in the draft if needed.
As for your statement regarding diffserv, I agree it has been widely used in
network thanks to its simplicity and scalability. Whether it can address all
services needs may be questionable. In IETF there have been many efforts to
meet specific service requirements by reserving network resources, such as
RSVP-TE, Detnet, etc. This draft aims to enhance SR with such capability.
Best regards,
Jie
-----Original Message-----
From: Joel M. Halpern [mailto:j...@joelhalpern.com]
Sent: Thursday, May 21, 2020 11:01 AM
To: qinfengwei <qinfeng...@chinamobile.com>; Dongjie (Jimmy)
<jie.d...@huawei.com>; 'SPRING WG' <spring@ietf.org>
Cc: draft-dong-spring-sr-for-enhanced-...@ietf.org
Subject: Re: [spring] 答复: Progressing
draft-dong-spring-sr-for-enhanced-vpn to enable SR with resource
management
This email (and the underlying document) asserts a need for "isolation"
without defining isolation, and without recognizing that the service
needs can be met by existing packet technologies.
The document also asserts that resource management requires packet
based resource reservation. We have significant evidence that
diffserv treatment coupled with central (PCE or equivalent) resource
management can address these needs.
At the very least, the discussion of isolation should be removed from
the document before it is evaluated for adoption.
Yours,
Joel
On 5/20/2020 10:47 PM, qinfengwei wrote:
Hi all,
At present, 5G applications have been widely developed, recently,
many enterprises require dedicated network resources to achieve
isolation from other services in the network, such as southern power
grid, Migu live video and Tencent cloud games. This document
provides the mechanism to enhance SR with resource identification
capability. This is an important feature to meet different
customer’s requirement in our network. Thus we believe it is a
generic and useful enhancement to SR, and hope it could move forward
quickly in the WG.
Thanks,
Fengwei Qin
*发件人:*spring [mailto:spring-boun...@ietf.org] *代表 *Dongjie
(Jimmy)
*发送时间:*2020年5月19日18:38
*收件人:*SPRING WG
*抄送:*draft-dong-spring-sr-for-enhanced-...@ietf.org
*主题:*[spring] Progressing draft-dong-spring-sr-for-enhanced-vpn to
enable SR with resource management
Hi all,
The latest version of draft-dong-spring-sr-for-enhanced-vpn was
uploaded in March, which describes a generic enhancement to SR to
support resource representation and identification, by introducing
the resource semantics to SR SIDs. With such enhancement, SR could
be used not only for explicit path steering, but could also be used
to build resource guaranteed paths or virtual networks. Such SR
based resource guaranteed paths or virtual networks can be used as
the underlay to support different VPN services. The mechanism
introduced in this document is complementary to the existing SR
functionalities, and helps to complete the tool set of segment routing.
Based on the discussion on mail list and the presentations on
previous IETF meetings, this draft has been revised several times,
all the comments received so far has been resolved and reflected in
the current version. To move forward, the authors would like to know
if there are further comments on this document, and people’s opinion
on whether it is in the right direction.
Comments and feedbacks are welcome.
Best regards,
Jie
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