On Sat, Jun 04, 2016 at 11:31:58AM +0800, 张晨 wrote: > I'm wondering how gre tunnel is implemented in OVS, in the l2gre or > the nvgre? And if it is implemented in l2gre, then what does the > tunnel_id field mean for l2gre, where could i find the standard file? OVS follows the RFCs for GRE, e.g. RFC 1701. The tunnel_id is the GRE key.