On Mon, Aug 29, 2016 at 07:22:10PM +1200, Warsang wrote: > Hello, > > I was wondering how the bucket selection is made in OVS 2.4 I found this in > the ml archive > http://openvswitch.org/pipermail/discuss/2016-January/019984.html > saying that :" > > Open vSwitch 2.4 and later by default hashes the source and > destination Ethernet address, VLAN ID, Ethernet type, IPv4/v6 > source and destination address and protocol, and for TCP and SCTP > only, the source and destination ports. The hash is "symmetric", > meaning that exchanging source and destination addresses does not > change the bucket selection.
That information is correct. It comes from the OVS FAQ. The entire FAQ entry says: ### Q: How does OVS divide flows among buckets in an OpenFlow "select" group? A: In Open vSwitch 2.3 and earlier, Open vSwitch used the destination Ethernet address to choose a bucket in a select group. Open vSwitch 2.4 and later by default hashes the source and destination Ethernet address, VLAN ID, Ethernet type, IPv4/v6 source and destination address and protocol, and for TCP and SCTP only, the source and destination ports. The hash is "symmetric", meaning that exchanging source and destination addresses does not change the bucket selection. Select groups in Open vSwitch 2.4 and later can be configured to use a different hash function, using a Netronome extension to the OpenFlow 1.5+ group_mod message. For more information, see Documentation/group-selection-method-property.txt in the Open vSwitch source tree. (OpenFlow 1.5 support in Open vSwitch is still experimental.) > I am trying to implement ECMP in ryu controller so if I do understand > correctly, using buckets from SELECT group is not the correct solution for > it uses a very different selection method is that right? What kind of selection method do you want? _______________________________________________ discuss mailing list discuss@openvswitch.org http://openvswitch.org/mailman/listinfo/discuss
