Re: [spring] [DMM] How Encoded SID should be placed in SL (SRv6-mobile-uplane)

[Satoru Matsushima <[e-mail]>]

Hi Kentaro,

I've replied to your previous mail that I hope it would answer to your
questions.

On Tue, Aug 29, 2017 at 12:44 AM, Kentaro Ebisawa <[e-mail]>
wrote:

> Hi,
>
> > Q2) Down Link packet (SRv6 to existing network)
> > > When the endpoint receives packet and the active segment of the
> > > packet indicates the SID, the endpoint pop the SRH of the SID, and
> > ...
> >
> > IPv6 Src: Origin Host
> > IPv6 Dst: SL[n]
> > Segment Left = n
> > SL[m] = Encoded SID
> > SL[m+1] = Segment m+1
> > SL[n] = Segment n
>
> Actually I think this differs for T.Insert case, where MN user packet is
> IPv6.
> # Unless I missed description that Stateless Interworking will always use
> encapsulation mode even if user packet is IPv6.


In DL, Stateless Interworking uses encapsulation for original IPv6 packet
with IPv4 and tunnel header.



>
>
> IPv6 Src: Origin Host
> IPv6 Dst: SL[n]
> Segment Left = n
> SL[0] = MN address
> SL[1] = Encoded SID
> SL[n] = Segment n
>
>
As I mentioned in the previous mail, SL indicates SL[1] at the interworking
node.



> And interworking segment should behave like below.
>
> When the endpoint receives packet and the active segment of the
> packet indicates the SID, the endpoint pop the SRH of the SID,
> >> Set IPv6 destination address as SL[0] (MN's address), and
> then the endpoint encaps the payload with the encoded information in
> the SID which are tunnel identifier of tunnel header, source and
> destination IPv4 address of IPv4 header described in Figure 3.
>


Right, it looks more precise description to it. Thanks!



>
> Maybe having example packet headers described for each cases
> (encap/insert, User Packet = IPv4/IPv6) will help this makes more easier to
> understand.
>
>
Absolutely yes, it's helpful to understand. I'll update the I-D with that
example in next revision.

Thanks,
--satoru