On Thu, May 02, 2013 at 09:31:21AM -0400, Nitin Sharma wrote: > On Wed, May 1, 2013 at 4:47 AM, Isaku Yamahata <[email protected]> wrote: > > On Tue, Apr 30, 2013 at 05:31:39PM -0400, Nitin Sharma wrote: > > I am trying to parse an ARP src and dst ip from arp broadcast, and I > could > > achieve it on OFv1.0 using the wiki article (pkt.protocols). However on > v1.2 , > > how would i achieve the same? > > Using match field of packet-in isn't portable regarding to OF switch > implementations because packet header fields may not be included. > Actually Open vSwitch only includes metadata(in_port, tun_id, registers), > not packet header fields. > > >From the spec, Please notice "Optionally": > Optionally, the OXM TLVs may also include packet header fields that > were previously extracted from the packet, including any > modifications of those in the course of the processing. > > So the portable way is for controller to parse packets itself, don't rely > on match fields. > It would be convenient to use match field to extract header fields, I > think. > I guess some vendors were against including header fields. So it resulted > in "Optionally". > > > Got it. Thanks! > > The reason I resorted to match fields is because I got the following error on > OF1.2 with msg.in_port > > in_port = msg.in_port > AttributeError: 'OFPPacketIn' object has no attribute 'in_port' > > Looking at the OFPPacketIn attributes for OF1.2 implementation, it was > different than OF1.0. > > Do you recommend to use parsing using the pkt library for everything > (including > headers - for compatibility with any vendor switches implementation), or > except > (in_port) which can still follow the match fields for headers. I am just > trying > to follow the best practice intended.
I use the former because the latter doesn't work with open vswitch. thanks, -- yamahata ------------------------------------------------------------------------------ Introducing AppDynamics Lite, a free troubleshooting tool for Java/.NET Get 100% visibility into your production application - at no cost. Code-level diagnostics for performance bottlenecks with <2% overhead Download for free and get started troubleshooting in minutes. http://p.sf.net/sfu/appdyn_d2d_ap1 _______________________________________________ Ryu-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/ryu-devel
