Re: [openflow-discuss] OpenFlow Switch Management Tool

2013-10-21 Thread Carlos Ferreira
Ok, there may be some misinterpretations of what I wanted to say. When I see a Central controller, I see an entity. I don't see a single or a group of machines, I see a concept. For me a central control system is still central, even if behind it, there are hundreds of machines executing instruction

Re: [openflow-discuss] Set-field header modifications with wildcard bits?

2013-10-21 Thread Marco Canini
Thank you Ben. Taking another look at the specs for 1.3.0, I see you are right. I somehow missed this sentence about set-field: "The value of oxm_hasmask must be zero and no oxm_mask is included." On Mon, Oct 21, 2013 at 11:10 PM, Ben Pfaff wrote: > On Mon, Oct 21, 2013 at 11:05:37PM +0200, Mar

Re: [openflow-discuss] Set-field header modifications with wildcard bits?

2013-10-21 Thread Ben Pfaff
On Mon, Oct 21, 2013 at 11:05:37PM +0200, Marco Canini wrote: > Imagine I want to have a rule that for every matching packet modifies > just the first byte of the dst ETH address and leaves the rest as is. > Can I do this in OpenFlow? > Since version 1.2, set-field uses OXM field value+mask types.

[openflow-discuss] Set-field header modifications with wildcard bits?

2013-10-21 Thread Marco Canini
Hello, Imagine I want to have a rule that for every matching packet modifies just the first byte of the dst ETH address and leaves the rest as is. Can I do this in OpenFlow? Since version 1.2, set-field uses OXM field value+mask types. However, reading from the specs, I am not clear whether the co

Re: [openflow-discuss] OpenFlow Switch Management Tool

2013-10-21 Thread Andrew Ferguson
hi Carlos, On Oct 21, 2013, at 8:34 AM, Carlos Ferreira wrote: > I don't really understand why would anyone want multiple controllers, when > there could be only one controller and over it, multiple apps implementing > different services. Its a much more simple layered approach. multiple contr

Re: [openflow-discuss] OpenFlow Switch Management Tool

2013-10-21 Thread Carlos Ferreira
Why not having the same controller, controlling all the switches? What is the problem? Remember that central control is a concept. Its implementation can follow diverse paths, going from 1 server only to an app running in a cloud. I don't really understand why would anyone want multiple controller