As for the maximum label stack depth reading capability, it has been defined in 
https://tools.ietf.org/html/draft-ietf-ospf-mpls-elc and 
https://tools.ietf.org/html/draft-ietf-isis-mpls-elc. Once the WGLC for 
https://tools.ietf.org/html/draft-ietf-mpls-spring-entropy-label is finished, 
we will request the WGLC for the above two drafts.

Best regards,
Xiaohu

> -----邮件原件-----
> 发件人: Isis-wg [mailto:[email protected]] 代表 Ketan Talaulikar (ketant)
> 发送时间: 2017年12月20日 17:51
> 收件人: Christian Hopps; [email protected]
> 抄送: [email protected]; [email protected]
> 主题: Re: [Isis-wg] WG Last Call for draft-ietf-isis-segment-routing-msd-07
> 
> Hello,
> 
> I support this document and would like to ask the authors and WG to consider 
> if
> we can expand the scope of this draft to not just "imposition" of the SID 
> stack
> but also other similar limits related to other actions (e.g. reading, 
> processing,
> etc.). With Segment Routing, we are coming across various actions that nodes
> need to do with the SID stack for different purposes and IMHO it would be
> useful to extend the MSD ability to cover those as they arise.
> 
> Thanks,
> Ketan
> 
> -----Original Message-----
> From: Isis-wg [mailto:[email protected]] On Behalf Of Christian Hopps
> Sent: 20 December 2017 14:03
> To: [email protected]
> Cc: [email protected]; [email protected]
> Subject: [Isis-wg] WG Last Call for draft-ietf-isis-segment-routing-msd-07
> 
> 
> The authors have asked for and we are starting a WG Last Call on
> 
>  https://datatracker.ietf.org/doc/draft-ietf-isis-segment-routing-msd/
> 
> which will last an extended 4 weeks to allow for year-end PTO patterns.
> 
> An IPR statement exists:
> 
> 
> https://datatracker.ietf.org/ipr/search/?submit=draft&id=draft-ietf-isis-segment-
> routing-msd
> 
> Authors please reply to the list indicating whether you are aware of any
> *new* IPR.
> 
> Thanks,
> Chris.
> 
> _______________________________________________
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> 
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