That works for me.

Thanks,
Alia
On Dec 2, 2015 11:08 PM, "Xuxiaohu" <xuxia...@huawei.com> wrote:

> Hi Alia,
>
> > -----Original Message-----
> > From: Alia Atlas [mailto:akat...@gmail.com]
> > Sent: Thursday, December 03, 2015 11:07 AM
> > To: The IESG
> > Cc: draft-ietf-bess-virtual-sub...@ietf.org; aret...@cisco.com;
> > bess-cha...@ietf.org; martin.vigour...@alcatel-lucent.com; bess@ietf.org
> > Subject: Alia Atlas' Discuss on draft-ietf-bess-virtual-subnet-06: (with
> DISCUSS)
> >
> > Alia Atlas has entered the following ballot position for
> > draft-ietf-bess-virtual-subnet-06: Discuss
> >
> > When responding, please keep the subject line intact and reply to all
> email
> > addresses included in the To and CC lines. (Feel free to cut this
> introductory
> > paragraph, however.)
> >
> >
> > Please refer to
> https://www.ietf.org/iesg/statement/discuss-criteria.html
> > for more information about IESG DISCUSS and COMMENT positions.
> >
> >
> > The document, along with other ballot positions, can be found here:
> > https://datatracker.ietf.org/doc/draft-ietf-bess-virtual-subnet/
> >
> >
> >
> > ----------------------------------------------------------------------
> > DISCUSS:
> > ----------------------------------------------------------------------
> >
> > Thank you for a clear and well-written document.  I have one point that
> is
> > peripheral to most of the draft.
> >
> > In Section 4.3, it says:
> >
> >  " In addition, for any other
> >    applications that generate intra-subnet traffic with TTL set to 1,
> >    these applications may not work properly in the Virtual Subnet
> >    context, unless special TTL processing for such context has been
> >    implemented (e.g., if the source and destination addresses of a
> >    packet whose TTL is set to 1 belong to the same extended subnet,
> >    neither ingress nor egress PE routers should decrement the TTL of
> >    such packet.  Furthermore, the TTL of such packet should not be
> >    copied into the TTL of the transport tunnel and vice versa)."
> >
> > The idea of not decrementing TTL is quite concerning.  I can conjecture
> cases
> > where there is a routing loop between the relevant PEs - during
> reconvergence
> > when a host moves from one datacenter to another is a trivial case.
> >
> > One approach may be to ask why a packet would have a TTL of 1 and
> determine
> > if this case must be resolved.  Another might detecting a loop back to an
> > out-of-datacenter PE and dropping the packet.  I'm sure you can develop
> other
> > good ideas and solutions.
>
> How about doing the following text change:
>
> " In addition, for any other
>     applications that generate intra-subnet traffic with TTL set to 1,
>     these applications may not work properly in the Virtual Subnet
>     context, unless special TTL processing and loop-prevention mechanisms
> for such context have been
>     implemented. Details about such special TTL processing and
> loop-prevention mechanisms are outside the scope of this document."
>
> Best regards,
> Xiaohu
>
> >
> >
>
>
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