[ovs-discuss] SELECT groups - hash

Slavica Tomovic slavicat.cg at gmail.com
Sat Mar 24 22:30:12 UTC 2018

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
I am using OVS 2.5.2.

Also, how should I specify the fields? In the documentation, I found this:


Does this mean that I should specify the fields like this:
fields(nw_src nw_dst udp..)?

Thanks in advance,

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.
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