Re: [spring] WG Adoption Call for draft-dong-spring-sr-for-enhanced-vpn

Shunsuke Homma <> Mon, 08 February 2021 16:05 UTC

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From: Shunsuke Homma <>
Date: Tue, 9 Feb 2021 01:04:50 +0900
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To: James Guichard <>
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Subject: Re: [spring] WG Adoption Call for draft-dong-spring-sr-for-enhanced-vpn
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Hi WG,

I think that this document is good enough as starting point for the WG, and
I support the adoption. There are many drafts related to network slice with
SR (e.g., SR + Flex-algo, draft-bestbar-spring-scalable-ns, etc.) and I
hope it will be clarified which is the best in future work.

The following are my comments to the draft.
- The example describes three isolated VTNs. I assume (hard) isolation will
cause split loss, and oversubscription will be sometimes needed. Hence, it
may be better to allow a resource-aware SID to belong to multiple VTNs.

- From network slicing (i.e., NaaS model) perspective, I assume visibility
will be especially important. As one more important requirement, network
operators want to provide only information of the VTN whose customer uses
to that customer. For example, if a customer gets VTN information with
BGP-LS, some mechanisms to prevent to leak other VTNs information in BGP-LS
would be needed.

- There is a typo in figure2. The adj-SID of the link from 203 to 204 in
green VTN should be 2002.



On Wed, Jan 27, 2021 at 8:47 PM James Guichard <> wrote:

> Dear WG:
> This message starts a 2 week WG adoption call for
> ending February 10th 2021.
> After review of the document please indicate support (or not) for WG
> adoption to the mailing list and if you are willing to work on the
> document, please state this explicitly. This gives the chairs an indication
> of the energy level of people in the working group willing to work on this
> document. Please also provide comments/reasons for your support (or lack
> thereof) as this is a stronger way to indicate your (non) support as this
> is not a vote.
> Thanks!
> Jim, Bruno & Joel
> _______________________________________________
> spring mailing list