[ovs-discuss] Difference between set_field:x.x.x.x->nw_dst and mod_nw_dst

[D3c3 Balus]

Thank you very much for the explanation !!
That’s exactly the answer I was looking for :-)

> On Jul 17, 2016, at 11:34 PM, Ben Pfaff <blp at ovn.org> wrote:
> 
> On Sun, Jul 17, 2016 at 11:07:17PM +0100, D3c3 Balus wrote:
>> I’d like to understand the difference between these 2 actions:  actions=set_field:1.1.1.1->nw_dst    vs.   actions=mod_nw_dst:1.1.1.1 ?
>> In my understanding, the end result is the same, but what would be different ?
>> 
>> Yes, I have read about the differences between set_field:value and load:value  (not interested in this)
> 
> The differences are all in technicalities.
> 
> mod_nw_dst is an OpenFlow 1.0 and 1.1 action.  set_field is a more
> general-purpose OpenFlow 1.2 and later action (and also an Open vSwitch
> extension to OF1.0 and OF1.1).
> 
> In OpenFlow 1.0, mod_nw_dst doesn't imply any prerequisite on the flow
> match; that is, it can be used in a flow that does not match on an
> Ethernet type of 0x800.  In OpenFlow 1.1 and later, it does require such
> a flow match, and the same is true of set_field regardless of OpenFlow
> version.