On Tue, May 8, 2012 at 8:22 AM, Jesse Gross <je...@nicira.com> wrote:
> On Mon, May 7, 2012 at 6:48 PM, Brandon Heller <brand...@stanford.edu> > wrote: > > I'd like to configure OVS using OpenFlow+Nicira extensions to push two > VLAN > > tags, to load-balance at higher levels of a multi-rooted tree on physical > > switches that only support OpenFlow 1.0 in firmware and so don't support > > ECMP. Double-stacked VLANs aren't strictly necessary; double IP-in-IP or > > VLAN + IP-in-IP would probably work too. > > > > One possibility may be to use a nicira_header to add a VLAN header with > > OFPAT_SET_VLAN_VID and then output to NXAST_RESUBMIT. The resubmit > match > > would then need to encap a VLAN the next time rather than set it, and I > > don't see an action for that other than maybe tunneling. > > Resubmitting won't help since it doesn't change the action - the > OpenFlow 1.0 action will just set it the second time. Internally OVS > has the ability to push multiple tags but that's not exposed to the > outside. > Time to expose it, then. Can you provide a pointer to the code section and private action? Thanks. > You could do vlan in GRE or if you took multiple trips through OVS, > GRE in GRE or GRE in vlan. > To my knowledge, the Indigo firmware on the hardware switches does not support matching on GRE, so I'm not sure how to make use of GRE. Thanks, -b
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