[ovs-discuss] SELECT groups - hash

Slavica Tomovic slavicat.cg at gmail.com
Sat Mar 24 22:57:57 UTC 2018


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.
>>
>
>
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