From: Lucy yong [mailto:[email protected]] Sent: Wednesday, September 18, 2013 6:11 PM To: Pat Thaler; Pankaj Garg; [email protected] Cc: [email protected]; [email protected] Subject: RE: comments on draft-sridharan-virtualization-nvgre-03
From: Pat Thaler [mailto:[email protected]] Sent: Wednesday, September 18, 2013 6:42 PM To: Lucy yong; Pankaj Garg; [email protected]<mailto:[email protected]> Cc: [email protected]<mailto:[email protected]>; [email protected]<mailto:[email protected]> Subject: RE: comments on draft-sridharan-virtualization-nvgre-03 Dear Lucy, I'm responding to your question to chip vendors about using NVGRE with your UDP encap draft. It isn't that supporting any one packet format in hardware is a problem. The issue is the number of formats that need to be supported by a chip - each may be small but the number adds up. Adding another packet format variant isn't justified and would be burdensome for the chips. [Lucy] My suggestion is not about adding a new format. It is to enhance existing NVGRE protocol. >From the point of view of hardware handling of the frames, putting the UDP >header in between the IP and NVGRE headers makes it a new format for us. The VXLAN packet format already provides for use cases where a flow field in the UDP header is desired. There is no need to duplicate that capability by adding an NVGRE in UDP format. We would be strongly against udp encapsulation of NVGRE. [Lucy] This is not about duplicate that capability, it is about use of a common way in supporting underlying ECMP. Do you support both NVGRE and VXLAN encapsulation, or only VXLAN encapsulation? There are Broadcom authors on both the VXLAN and NVGRE I-Ds. We support both formats going forward. Regards, Lucy Regards, Pat [Lucy] If NIC hardware support VxLAN which use UDP port for the flow entropy, it should be easy to support gre-in-udp encaps as well. Will be great to see chip vendor comment on this. Please take a look at the gre-in-udp encapsulation proposal (below), welcome comment on it. Regards, Lucy Here is the draft. The TSVWG will adopt it as WG draft soon. http://datatracker.ietf.org/doc/draft-yong-tsvwg-gre-in-udp-encap/ Regards, Lucy
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