Re: [trill] A tweak to option 2, if it's hard to upgrade VL guys to FGL-safe
zhai.hongjun@zte.com.cn Fri, 01 February 2013 08:30 UTC
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To: Radia Perlman <radiaperlman@gmail.com>
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Cc: trill-bounces@ietf.org, Anoop Ghanwani <anoop@alumni.duke.edu>, Ayan Banerjee <ayabaner@gmail.com>, Sam Aldrin <aldrin.ietf@gmail.com>, "Tissa Senevirathne (tsenevir)" <tsenevir@cisco.com>, "trill@ietf.org" <trill@ietf.org>, Donald Eastlake <d3e3e3@gmail.com>, Jon Hudson <jon.hudson@gmail.com>
Subject: Re: [trill] A tweak to option 2, if it's hard to upgrade VL guys to FGL-safe
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As FGL frames and VL frames have different Ethertype, it is easy for FGL-safe RBridges to differentiate the two types of frames in data plane. And the tweaked Option 2 allows VL-RBridges exiting at the edge of a nework with FGL links if their FGL-safe neighbors can differentiate the two type frames, I am happy with it. So, I support this tweaked option. Best Regards, Zhai Hongjun """""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""" Protocol Development Dept.VI, Central R&D Institute, ZTE Corporation No. 68, Zijinghua Road, Yuhuatai District, Nanjing, P.R.China, 210012 Zhai Hongjun Tel: +86-25-52877345 Email: zhai.hongjun@zte.com.cn """"""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""""" Radia Perlman <radiaperlman@gmail.com> 发件人: trill-bounces@ietf.org 2013-02-01 05:47 收件人 "Tissa Senevirathne (tsenevir)" <tsenevir@cisco.com> 抄送 Anoop Ghanwani <anoop@alumni.duke.edu>, Ayan Banerjee <ayabaner@gmail.com>, Sam Aldrin <aldrin.ietf@gmail.com>, "trill@ietf.org" <trill@ietf.org>, Donald Eastlake <d3e3e3@gmail.com>, Jon Hudson <jon.hudson@gmail.com> 主题 [trill] A tweak to option 2, if it's hard to upgrade VL guys to FGL-safe The other thread was getting a bit long, so I'm changing the subject line, since here I'm proposing a tweak to option 2 that will make it less restrictive. To review, option 2 as originally proposed had this property: >>With option 2, a VL guy cannot even be at the edge of a network with FGL links unless it is upgraded to >>FGL-safe AND advertises that it is FGL-safe. Option 2 says a VL guy is completely ostrasized once >>FGL-labeled links are introduced. There is NO coexistence of VL guys and FGL-guys once FGL-links are >>advertised. Here is the proposed tweak: An FGL-safe guy has two choices of what to do with a VL neighbor (once FGL links are advertised) a) ostrasize the VL neighbor completely (as was in option 2) b) advertise a very high cost to the VL neighbor AND ALSO discard any FGL frames that would be forwarded to that VL neighbor. If an FGL-safe guy is capable of differentiating between FGL and VL frames...forwarding VL but discarding FGL to a VL neighbor, then this would allow VL guys to be at the edge and successfully talk across an FGL core. If an FGL-safe guy is not capable of differentiating between FGL and VL frames, then the VL guy will be ostrasized. As for transit...if a VL guy is in the core, its FGL neighbors will report such high costs to it that if there is any FGL path, that will be the one that is chosen, and if there isn't, then you're no worse off than if the VL guy were completely ostrasized....it will look like there is a path, but FGL packets will be lost on the path. And of course, you shouldn't have the VL guy be the root of a multicast tree, since link costs to it won't avoid it being on the path between FGL guys. Radia _______________________________________________ trill mailing list trill@ietf.org https://www.ietf.org/mailman/listinfo/trill
- [trill] A tweak to option 2, if it's hard to upgr… Radia Perlman
- Re: [trill] A tweak to option 2, if it's hard to … zhai.hongjun