[ovs-discuss] SELECT groups - hash

[Ben Pfaff]

I don't think we support this in pre-OF1.5.

On Sat, Mar 24, 2018 at 11:57:57PM +0100, Slavica Tomovic wrote:
> I forgot to mention that I use Floodlight controller. Can I achieve what
> you suggested with the controller that does not support OF1.5?
> 
> BR,
> Slavica
> 
> 
> 2018-03-24 23:30 GMT+01:00 Slavica Tomovic <slavicat.cg at gmail.com>:
> 
> > Thank Ben.
> >
> > Can you help me with the syntax? I tried this:
> >
> > ovs-ofctl  mod-group s11 group_id=24, type=select, selection_method=hash
> >
> > However, I am getting an error the mod-group command takes at most two
> > arguments.
> > I am using OVS 2.5.2.
> >
> > Also, how should I specify the fields? In the documentation, I found
> > this:
> >
> > fields(field[=mask]...)
> >
> > Does this mean that I should specify the fields like this: fields(nw_src nw_dst udp..)?
> >
> >
> > Thanks in advance,
> > Slavica
> >
> > 2018-03-24 19:10 GMT+01:00 Ben Pfaff <blp at ovn.org>:
> >
> >> On Sat, Mar 24, 2018 at 06:45:50PM +0100, Slavica Tomovic wrote:
> >> >  Hi,
> >> >
> >> > I am using SELECT Group tables for load balancing purposes in OpenFlow
> >> > network. However, I found that OVS by default performs hashing only on
> >> IP
> >> > addresses, MAC addresses, VLAN IDs, TCP ports and EthType fields. Is it
> >> > possible to change this and use a hash function that depends on UDP
> >> port?
> >> >
> >> > I have read these posts:
> >> > https://mail.openvswitch.org/pipermail/ovs-discuss/2016-July
> >> /041934.html
> >> > https://mail.openvswitch.org/pipermail/ovs-dev/2015-March/214529.html
> >> >
> >> > and according to them I need to do this by implementing a logic for
> >> > creation of group properties structure on SDN controller. Can I avoid
> >> this
> >> > somehow and configure OVS switches with some command to perform hashing
> >> on
> >> > UDP ports?
> >>
> >> It sounds like you just need to use ovs-ofctl to configure the behavior
> >> you want.  Did you read the "Group Syntax" section in the manpage?  You
> >> want to specify the "fields" parameter.
> >>
> >
> >