There are easier ways to do this which don’t required data-plane changes. https://tools.ietf.org/html/draft-sajassi-l2vpn-evpn-inter-subnet-forwardin g-02
On 25/11/13 07:40, "Xuxiaohu" <[email protected]> wrote: > > >> -----邮件原件----- >> 发件人: Henderickx, Wim (Wim) [mailto:[email protected]] >> 发送时间: 2013年11月25日 14:29 >> 收件人: Xuxiaohu; [email protected] >> 抄送: [email protected] >> 主题: Re: 答复: New Version Notification for >> draft-xu-l3vpn-virtual-subnet-02.txt >> >> It is not about TTL 1, no TTL decrement should happen for intra-subnet >> forwarding at all On top you need to modify the data-plane to achieve >>this, >> since it now needs to find out if it is intra or inter subnet where >>current PE(s) >> don’t have to do this. > >Sure, it needs some change to the implementation of PE routers. That's >why we need a draft to specify the implementation requirements. > >> On 25/11/13 07:22, "Xuxiaohu" <[email protected]> wrote: >> >> >Wim, >> > >> >It said clearly "if the source and destination addresses of a packet >> >whose TTL is set to 1 belong to the same extended subnet, both ingress >> >and egress PE routers MUST NOT decrement the TTL of such packet." Did >> >you doubt that the PE routers could know whether the source and >> >destination address belong to the same extended subnet? >> > >> >Xiaohu >> > >> >> -----邮件原件----- >> >> 发件人: Henderickx, Wim (Wim) >> [mailto:[email protected]] >> >> 发送时间: 2013年11月25日 14:08 >> >> 收件人: Xuxiaohu; [email protected] >> >> 抄送: [email protected] >> >> 主题: Re: New Version Notification for >> >>draft-xu-l3vpn-virtual-subnet-02.txt >> >> >> >> On the TTL issue I believe this is not addressing the issue. We can >> >>say don’t decrement but when and how will the PE(s) do or don’t. >> >> >> >> On 25/11/13 03:22, "Xuxiaohu" <[email protected]> wrote: >> >> >> >> >Hi all, >> >> > >> >> >Major changes since the -01 version include: >> >> > >> >> >1) add a section about TTL consideration; >> >> >2) remove the section of PE Router FIB Reduction; >> >> >3) remove the section of PE Router RIB Reduction; >> >> > >> >> >Any further comments are welcome. BTW, the removed sections as >> >> >mentioned above would be described in separate docs. >> >> > >> >> >Best regards, >> >> >Xiaohu >> >> > >> >> >> -----邮件原件----- >> >> >> 发件人: [email protected] [mailto:[email protected]] >> >> >> 发送时间: 2013年11月25日 10:10 >> >> >> 收件人: Brendan Fee; Susan Hares; Fan Yongbing; Xuxiaohu; Xuxiaohu; >> >> >>Christian Jacquenet; Truman Boyes; Yongbing Fan >> >> >> 主题: New Version Notification for >> >> >>draft-xu-l3vpn-virtual-subnet-02.txt >> >> >> >> >> >> >> >> >> A new version of I-D, draft-xu-l3vpn-virtual-subnet-02.txt >> >> >> has been successfully submitted by Xiaohu Xu and posted to the >> >> >>IETF repository. >> >> >> >> >> >> Filename: draft-xu-l3vpn-virtual-subnet >> >> >> Revision: 02 >> >> >> Title: Virtual Subnet: A L3VPN-based Subnet Extension Solution >> >> >> Creation date: 2013-11-25 >> >> >> Group: Individual Submission >> >> >> Number of pages: 13 >> >> >> URL: >> >> >> >> >>http://www.ietf.org/internet-drafts/draft-xu-l3vpn-virtual-subnet-02.t >> >>xt >> >> >> Status: >> >> >>http://datatracker.ietf.org/doc/draft-xu-l3vpn-virtual-subnet >> >> >> Htmlized: >> >> >>http://tools.ietf.org/html/draft-xu-l3vpn-virtual-subnet-02 >> >> >> Diff: >> >> >> http://www.ietf.org/rfcdiff?url2=draft-xu-l3vpn-virtual-subnet-02 >> >> >> >> >> >> Abstract: >> >> >> This document describes a Layer3 Virtual Private Network >>(L3VPN)- >> >> >> based subnet extension solution referred to as Virtual Subnet, >> >>which >> >> >> can be used as a kind of Layer3 network virtualization overlay >> >> >> approach for data center interconnect. >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> Please note that it may take a couple of minutes from the time of >> >> >>submission until the htmlized version and diff are available at >> >> >>tools.ietf.org. >> >> >> >> >> >> The IETF Secretariat >> >> > >> > >
