Re: [spring] I-D Action: draft-ietf-spring-srv6-network-programming-06.txt

[Gyan Mishra <[e-mail]>]

On Thu, Dec 19, 2019 at 8:45 PM Brian E Carpenter <
[e-mail]> wrote:

> On 20-Dec-19 12:01, Robert Raszuk wrote:
> >>   And where is it forwarded to, since we are already at the DA?
> >
> > PSP operates at the n-1 segment end of the SR path so naturally after
> swapping DA it is forwarded to the segment end. Note that we are all along
> operating on the encapsulated header ... original packet including its
> original IPv6 header is sitting as passenger here.
> >
> > So last segment here will received encapsulated IPv6 packet will
> decapsulate it and fwd based on the original DA.
> >
> > Seems very simple :)
>
> Right, but the language in the PSP sub-section does not talk about
> decapsulation. I think the root problem may be using the word "pop", which
> is relevant in the MPLS label stack context but not here, without
> additional definition.
>

  [Gyan] I agree with what Brian is saying that pop in MPLS PHP or UHP you
are popping an MPLS label 4 byte shim, where here you are removing the SRH
header.  Not a really a pop.  The MPLS shim is an encapsulation since it’s
sits between the L2 and L3 header.  I think if we fix the verbiage and
change from pop to remove we may want to come up with some other name like
PSR & USR if “remove” was used.

>
>     Brian
>
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Gyan S. Mishra

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