FWIW, the earliest versions of OpenFlow started at port zero, but we changed it to one to make the interface index compatible with other protocols like SNMP. It wouldn't surprise me if there were inconsistencies left over from that.
--Justin On Apr 29, 2013, at 11:09 PM, Zoltán Lajos Kis <zoltan.lajos....@ericsson.com> wrote: > I think ports can go from 1 to OFPP_MAX inclusive, and the mistake is in the > comment on page 88 (should be <= OFPP_MAX). > > Every xxx_MAX constant in OpenFlow refers to the last usable id (OFPP_MAX, > OFPG_MAX, OFPM_MAX, OFPTT_MAX, ...). In most cases the structs explicitly say > so. > Ports are only special, because there the numbering starts from 1, which > makes the total number equal to the last usable id. > > Zoltan. > >> -----Original Message----- >> From: openflow-discuss-boun...@lists.stanford.edu [mailto:openflow- >> discuss-boun...@lists.stanford.edu] On Behalf Of Ben Pfaff >> Sent: Tuesday, April 30, 2013 7:54 AM >> To: Bertrand Bonnefoy-Claudet >> Cc: openflow-discuss@lists.stanford.edu >> Subject: Re: [openflow-discuss] Port numbering and OFPP_MAX >> >> On Mon, Apr 29, 2013 at 08:36:57PM -0500, Bertrand Bonnefoy-Claudet wrote: >>> Here is a minor point in the OpenFlow 1.3.1 specification (and most >>> previous versions) that I would like to clarify. >>> >>> Page 42 says that ports are numbered starting from 1 and that OFPP_MAX >>> is the maximum number of "normal" ports a switch can have. >>> >>> Page 88, on the other hand, says that a valid physical port should >>> have a number "< OFPP_MAX". >>> >>> So, to my understanding, page 42 implies OFPP_MAX is a valid port >>> whereas page 88 implies the contrary. >> >> This sounds like a mistake. I imagine that it arose because the earliest >> versions of OpenFlow numbered ports starting from 0. The intent is that port >> numbers are greater than 0 and less than OFPP_MAX. >> _______________________________________________ >> openflow-discuss mailing list >> openflow-discuss@lists.stanford.edu >> https://mailman.stanford.edu/mailman/listinfo/openflow-discuss > _______________________________________________ > openflow-discuss mailing list > openflow-discuss@lists.stanford.edu > https://mailman.stanford.edu/mailman/listinfo/openflow-discuss _______________________________________________ openflow-discuss mailing list openflow-discuss@lists.stanford.edu https://mailman.stanford.edu/mailman/listinfo/openflow-discuss
