Hi Dongjie,
On 26/03/2020 07:40, Dongjie (Jimmy) wrote:
Hi Peter,
As described in the abstract, the purpose of this draft is to define a
simplified control plane mechanism to build SR based Virtual Transport Network
(VTN), it is based on the combination of IS-IS Multi-Topology with other IS-IS
extensions, e.g. the extensions for TE, SR and L2 bundle. In a word, it tries
to reuse the existing TLVs as much as possible.
reusing the TLVs is not something that needs a standardization.
That said, this document introduces the mechanism of specifying per-topology TE attributes, which was not covered in the existing IS-IS MT (RFC 5120).
I can clearly see that TLVs defined in RFC5120 are listed in the
registry of sub-TLVs available for TLV 222/223
https://www.iana.org/assignments/isis-tlv-codepoints/isis-tlv-codepoints.xhtml#isis-tlv-codepoints-22-23-25-141-222-223
So I'm not sure what you are adding.
Similarly, it also introduces the mechanism of associating MT-IDs with a
particular member link of L2 bundle, which was not defined in IS-IS L2 Bundle
(RFC 8668).
carrying MT-ID in the L2 Bundle TLV is conceptually wrong.
It is the parent L3 link which has the association with the particular
topology ID, you can not change the topology per L2 link member.
You are trying to overload the MT-ID with the VTN semantics, but you can
not do it here. If you need a VTN ID for the L2 member link, which I'm
not sure why, you need to define a a new attribute and not mix it with
MT-ID.
thanks,
Peter
Thus we think it is appropriate to be standard track.
Best regards,
Jie
-----Original Message-----
From: Lsr [mailto:lsr-boun...@ietf.org] On Behalf Of Peter Psenak
Sent: Wednesday, March 25, 2020 10:09 PM
To: xie...@chinatelecom.cn; lsr <lsr@ietf.org>
Subject: Re: [Lsr] Using IS-IS Multi-Topology (MT) for Segment Routing based
Virtual Transport Network
Hi Chongfeng,
what exactly is being standardized in this draft? I don't see anything.
thanks,
Peter
On 25/03/2020 14:44, xie...@chinatelecom.cn wrote:
Hello, folks,
we have submitted a new draft of
https://tools.ietf.org/html/draft-xie-lsr-isis-sr-vtn-mt-00 .
It is about Using IS-IS Multi-Topology (MT) for Segment Routing based
Virtual Transport Network. Enhanced VPN (VPN+) as defined in
I-D.ietf-teas-enhanced-vpn aims to provide enhanced VPN service to
support some applications's needs of enhanced isolation and stringent
performance requirements. VPN+ requries integration between the
overlay VPN and the underlay network. A Virtual Transport Network
(VTN) is a virtual network which consists of a subset of the network
toplogy and network resources allocated from the underlay network. A
VTN could be used as the underlay for one or a group of VPN+ services.
This document describes a simplified mechanism to build the SR based
VTNs using IGP
multi- topology together with other well-defined IS-IS extensions.
Comments and suggestions are highly appreciated.
Chongfeng Xie
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