[ovs-discuss] Fwd: Bitmask

[George Papathanail]

---------- Forwarded message ---------
From: George Papathanail <papathanail24 at gmail.com>
Date: Τρί, 8 Ιαν 2019 στις 11:05 π.μ.
Subject: Re: [ovs-discuss] Bitmask
To: Justin Pettit <jpettit at ovn.org>


Hello again Justin,

I'm trying to accomplish a source routing implementation based on a paper:

*"In source routing, the entire path is inserted in the packet*
*header. We need a mechanism that allows each intermediate*
*router to read its next hop from the encoding."*


*Depending on the capabilities of switches in the network, one of the*
*following methods can be chosen for source routing in the*
*core of the network. The methods are listed in increasing*
*order of packet overhead.*

[image: tt;.png]

[image: ββ.png]

How can I do one of these with openflow?

Στις Δευ, 7 Ιαν 2019 στις 10:37 μ.μ., ο/η Justin Pettit <jpettit at ovn.org>
έγραψε:

> I'm not sure that I entirely understand what you're trying to accomplish,
> but you can match and modify both the MAC addresses and TTL fields using
> ovs-ofctl,  OVS doesn't support arbitrary math on fields (unless you count
> decrementing the TTL), however, if you have a limited range, you could just
> use a number of hard-coded flows that match on a particular value and then
> modify it appropriately.
>
> I'm not sure if that's helpful or not...
>
> --Justin
>
>
> > On Jan 7, 2019, at 9:45 AM, George Papathanail <papathanail24 at gmail.com>
> wrote:
> >
> > I have instantiate a topology in Mininet with 2hosts and 3 switches.
> > I have to encode the output ports of the switches on packet header in
> order to reduce the state of the switches.
> >
> > For example if the output ports are 3 , 5 , 4 the mac is
> 03:05:04:00:00:00. (if i understand well).
> > The second step is to create a pointer that show to the next hop output
> port.
> >
> > I'm trying to implement this.
> > <bitmask.png>
> >
> >
> >
> > P.S I' m new to the openflow and sdn
> >
> > Thank you
> >
> >
> >
> >       Απαλλαγμένο από ιούς. www.avast.com
> >
> > Στις Δευ, 7 Ιαν 2019 στις 7:23 μ.μ., ο/η Justin Pettit <jpettit at ovn.org>
> έγραψε:
> >
> > > On Jan 7, 2019, at 7:36 AM, George Papathanail <
> papathanail24 at gmail.com> wrote:
> > >
> > > Is it possible to generate a pointer with ovs-ofctl command?
> >
> > What do you mean?
> >
> > --Justin
> >
> >
> >
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mail.openvswitch.org/pipermail/ovs-discuss/attachments/20190108/a878d629/attachment-0001.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: tt;.png
Type: image/png
Size: 123773 bytes
Desc: not available
URL: <http://mail.openvswitch.org/pipermail/ovs-discuss/attachments/20190108/a878d629/attachment-0002.png>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: ??.png
Type: image/png
Size: 148031 bytes
Desc: not available
URL: <http://mail.openvswitch.org/pipermail/ovs-discuss/attachments/20190108/a878d629/attachment-0003.png>