Hi fengwei,
Please see inline with [PSF]
Regards,
PSF
Hi Shaofu,
The resource in this document refers to the data plane resource used for packet
processing. This aligns with the resource reservation concept in TEAS. This has
been clarified in the draft.
With SR architecture, SIDs can be used to represent any instructions, thus
using SID to identify a set of network resource complies with the SR
architecture. However, the segments as defined in RFC 8402 and other documents
before this draft did not cover this useful semantic. Thus IMO this needs to be
specified explicitly under the SR architecture first, so that further work
based on resource-aware SIDs can be done in relevant WGs.
[PSF] I don’t know if this is the view of you or that of most people. I
provided the concerns in last mail that there are already resource related SIDs
allocation. You can question that the existing mechanism of resource related
SID allocation maybe not enough, and need complement more scenarios and
solutions. That is OK. But even there are only 10% scenarios that the existing
mechanism of resource related SID allocation can cover, and 90% scenarios need
to be improved by you, you can't change the fact that resource semantic already
exists. Otherwise, it is hard to explain why an SR-TE path with specific
resource reserved and specific resource related SIDs can be created to replace
a traditional RSVP-TE LSP, without the guidance of this document.
Thus, what is missing is not this resource-awareness concept, but more
mechanisms to address more scenarios. AFAIK, The existing mechanism mainly
focuses on coarse-grained resource partition, if you can further introduce
mechanisms to describe how to do fine-grained resource partitioning, for
example, let the queue policy within the node be more than a local matter, etc,
that would be very comforting, and I think that would be dry goods.
Thanks,
Fengwei Qin
发件人: spring [mailto:[email protected]] 代表 [email protected]
发送时间: 2020年7月23日 09:25
收件人: [email protected]
抄送: [email protected]; [email protected]; [email protected];
[email protected]; [email protected]
主题: Re: [spring] WG AdoptionCallfordraft-dong-spring-sr-for-enhanced-vpn
Hi zhenqiang,
Resource is a big, all encompassing concept. Similarly, service concept,
application concept, intent concept, etc, you can find more.
IMO, we can't ignore the fact that the current SR architecture already cover
resource related SID allocation, but to surmise that it lacks resource meaning,
then to submit an unnecessary and redundant framework.
AFAIK, there have already been several documents that defined the allocation of
SID for specific resouce, for example:
draft-ietf-lsr-flex-algo described topology related resource partition and
algorithm based SID allocation,
L2-bundles(rfc8668) described the allocation of member adjacency SIDs for
subdivided link resources
draft-peng-teas-network-slicing described slice related resource partition and
corresponding SID allocation.
All of these solutions follow the existing SR architecture. Thus it is not the
truth that we all think that the existing SR architecture does not cover
allocating resource-awareness SID and explicitly resource capability or
semantic need to be defined.
I believe there will be more SR based solution in the future. For simplicity
and refinement, we can not paint the lily to change the existing architecture
at will, ignoring the fact that it can work and perfect support for every
solutions. Otherwise, for some purpose, someone can also persist that the SR
architecture lacks service meanning, application meaning, intent meanning, etc,
then more and more unnecessary X-awareness framework appear.
So let us focus on specific solutions, i.e, just like what is done in flex-algo
or other documents, detailed control extension and forwarding mechanism for
virtual network (yes ,you can say this doc is not only for virtual network, but
this is exactly what makes me confused. It is not clear for other purpose) . A
new X-awareness framework is really unnecessary, except for standard strategy.
Regards,
PSF
原始邮件
发件人：[email protected] <[email protected]>
收件人：陈然00080434;Dongjie (Jimmy) <[email protected]>;
抄送人：James Guichard <[email protected]>;[email protected]
<[email protected]>;[email protected] <[email protected]>;
日 期 ：2020年07月21日 12:48
主 题 ：Re: [spring] WG AdoptionCallfordraft-dong-spring-sr-for-enhanced-vpn
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Hi Ran,
Thank you very much for your interests in and comments on this draft.
Yes, you are right that SR architecture supports resource related SIDs. So we
can specify the resource related framework under SR architecture. This is the
main purpose of this doc. RFC8402 supports resource related SIDs, but doesn't
define them, which are defined in this doc.
However, I am afraid I can not agree with you that this doc is mainly to manage
and maintain virtual network resources. The concept and mechanism of
resource-awareness SID is introduced in this doc to enrich the semantics of SR
SID and to enhance the SR architecture. Thanks to its flexibility and
extensibility.
Resource related SIDs introduced in this doc can be used to construct virtual
networks, resource isolated pathes, dedicated queques in one node and so on,
which depends on the application scenarios.
Since this draft belongs to SPRING WG, IMO it is correct that it focuses the
semantics and functions associated with SR SIDs. The identifier and mechanisms
in control plane could be discussed in the corresponding protocol WGs as next
step. Please pay attention to our related work in the protocol WGs and you are
welcome to present your comments there... Thanks alot.
Best regards,
Zhenqiang Li
--------------------------------------------------------------------------------
[email protected]
From: [email protected]
Date: 2020-07-20 17:11
To: [email protected]
CC: james.n.guichard; spring; spring-chairs
Subject: Re: [spring]WG Adoption Callfordraft-dong-spring-sr-for-enhanced-vpn
Hi Jie,
IMO, the essence of the problem is that an identifier should be introduced to
manage and maintain virtual network resources, not whether it is necessary to
allocate resource related SIDs , because the current SR architecture already
supports resource related SIDs allocation, there is no limit to that. For
example, service SID (compuated resource related), Node/Adjacency
SID(topological resource related), etc. Especially, SRv6 SID encourages
programming anything. Can we say that these SIDs have no resource meaning?
Thus, draft-dong-spring-sr-for-enhanced-vpn does not introduce any new content
on the existing SR architecture.
For identifier to manage and maintain virtual network resources,
draft-peng-teas-network-slicing firstly to introduce a new identifier (AII) in
the network to unifiedly identify the topology, computing and storage resource.
Before that, other existing identities only focus on topology resources.
Just for topology related resource, Segment Routing with MTR/Flex-algo/AII all
support the division of multiple topological resource, and already support
allocatoin of SID per MT-ID/algorithm/AII. Especially for link resource, the
bandwidth of the same link can be subdivided into multiple resources.
If these subdivided resources exist in the form of sub-interface resources,
L2-bundles(rfc8668) provides the method to assign adjacency-SID for members, In
other words, the allocation of member adjacency SID has already been aware of
these subdivided resources, each sub-interface has its own link attributes
(bandwidth, delay, etc.).
If there are no sub-interface, the link can also be shared by multiple virtual
networks to allocate multiple adjacency SIDs. Under the existing SR
architecture, draft-peng-teas-network-slicing and
draft-peng-lsr-algorithm-related-adjacency-sid have already described the
allocation of adjacency SID per AII and algorithm.
Obviously, the above SR with MTR/Flex-algo/AII are all complete solutions,
including control plane extensions and forwarding mechanisms, and they need not
make any changes to the SR architecture.
I wonder according to draft-dong-spring-sr-for-enhanced-vpn, what can we do
under its guidance, or what we can't do without this draft?
Regards,
Ran
发件人：Dongjie(Jimmy) <[email protected]>
收件人：陈然00080434;[email protected]
<[email protected]>;[email protected] <[email protected]>;
抄送人：[email protected] <[email protected]>;
日 期 ：2020年07月16日 19:50
主 题 ：RE: [spring] WG Adoption Callfordraft-dong-spring-sr-for-enhanced-vpn
Hi Ran,
Thanks for your comments. While I don’t quite get your point of objection.
Perhaps you have some misunderstanding about the relationship of the drafts
mentioned.
RFC 8402 introduced the topology and service semantics of SR SID, this document
proposed to add resource semantics to SIDs. Then MT or Flex-Algo are control
plane mechanism for the distribution of topology-specific SIDs... The
relationship with these documents are described in this draft.
My reading of draft-peng in LSR and TEAS is that they may provide an option of
control plane extensions for the resource-aware SIDs defined in this document,
which just proves that the enhancement in this document is in the right
direction, and more work based on it could be done in relevant WGs.
Thus my suggestion would be to have the SR enhancement adopted in SPRING first,
then more discussion about its control plane could happen in other WGs as the
next step.
Hope this helps.
Best regards,
Jie
From: spring [mailto:[email protected]]On Behalf Of [email protected]
Sent: Thursday, July 16, 2020 5:20 PM
To: [email protected]; [email protected]
Cc: [email protected]
Subject: Re: [spring] WG Adoption Call fordraft-dong-spring-sr-for-enhanced-vpn
Dear WG,
I don't support WG adoption.
It is not a new idea for each Virtual Network to have its own SIDs.
e.g. The earlist description of the SID be allocated per flex-algorithm and
related metric
information was in draft-hegdeppsenak-isis-sr-flex-algo-00(2017.7.17) (now is
draft-ietf-isis-sr-flex-algo) .
The earlist description of the SID be allocated per MT was in
draft-filsfils-spring-segment-routing-04(2014.7...3)
(now is RFC8402 ), and draft-peng-lsr-network-slicing-00(2019.2.25) describe the
SID be allocated per AII(alias alice). For slice
resources,https://tools.ietf.org/html/draft-peng-teas-network-slicing-03
induced slice-id(AII) for slice resources management, and can differentiate
them (e.g. L2 link or L3 interface,
section 7 ), and how to compute SR-BE or SR-TE path according to AII combined
with other criteria.
Regards,
Ran
-----Original Message-----
From: spring <[email protected]> On Behalf Of James Guichard
Sent: Wednesday, July 15, 2020 8:17 PM
To: [email protected]
Cc: [email protected]
Subject: [spring] WG Adoption Call for draft-dong-spring-sr-for-enhanced-vpn
Dear WG:
This email begins a 2 week WG adoption call for
https://datatracker.ietf.org/doc/draft-dong-spring-sr-for-enhanced-vpn/
<https://datatracker.ietf.org/doc/draft-dong-spring-sr-for-enhanced-vpn/>
ending Wednesday 29th July 2020.
Please speak up if you support or oppose adopting this document into the WG.
Please also provide comments/reasons for that support (or lack thereof).
Silence will not be considered consent.
Thanks!
Jim, Joel & Bruno
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