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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