Hi martin, Thanks again! We still ask some questions inline.
On Fri, Mar 26, 2010 at 9:56 AM, Martin Casado <[email protected]> wrote: > Inline: > > > Dear martin, >> >> Thanks for your reply. We just think when the network environment contains >> more than 2 NOXs, what is the behavior between them? So, NOX do not do the >> load balance currently? >> > Correct, Nox does not support multiple instances working together. For > that, you will have to extend Nox. If we want to modify, which source code is the good starting point? > > >> By the way, We still have some questions which need to your help. >> 1) What is the process that NOX want to build its controlled OpenFlow >> switches topology? NOX will send an event to notify all controlled OpenFlow >> switches, then all OpenFlow switches will send LLDP out from their owned >> ports to all connected switches? >> > Right. Nox sends out LLDP packets from every switch port and then listens > for incoming LLDP packets on neighbor switches to determine the topology. This means that the LLDP packets are sent out from NOX? When LLDP packets arrived on every switches which connect to NOX, every switch will redirect LLDP packets to its connected switches? > > 2) The discoveried topology will be stored on NOX? >> > Correct. > > 3) Support we have a network topology, which showed below, these OpenFlow >> switches are all controlled by one NOX. What do the NOX write into the >> flowtables of these OpenFlow switches when user ping host2 from host1? >> >> host1 -- ofsw1 ------- ofsw2 >> | | >> | | >> ofsw3 ------- ofsw4 -- host2 >> > > Nox doesn't support topologies with loops (though there are a number of > spanning tree implementations which have been ported to it) so this would > not work. However, if there wasn't a loop, then nox would set up flows for > the ARP and ICMP packets in both directions. > > We assume to remove the link between ofsw1 and ofsw2 in the above topology (no loop topology). NOX knows that ofsw1 connect to ofsw3, ofsw3 connect to ofsw4 by LLDP packets? If it is correct, will NOX write ofsw3's information into ofsw1, such as which port of ofsw1 connects to ofsw3 port? There will have the similar information on ofsw3 and ofsw4? Bests, JW .martin > > >> We really appreciate to all the help you gave us. >> Best, >> >> JW >> >> On Fri, Mar 26, 2010 at 5:55 AM, Martin Casado <[email protected]<mailto: >> [email protected]>> wrote: >> >> Hi JW, >> >> Nox was not built to support coordination between two instances. >> Why don't control both switches from the same Nox process? >> >> .martin >> >> Dear all, >> >> We just join the world of OpenFlow and NOX lately. Everything >> for us is new and also doesn't know how to start. Currently, >> we have built the enviroment which contains 1 NOX (nox1), 1 >> OpenFlow switch with NetFPGA (ofsw1), and 2 hosts which >> connect to ofsw1. After installing, we got some quesions about >> it. Could someone could help us? >> >> (current) >> nox1 -- ofsw1 >> |--- host1 >> |--- host2 >> >> (suppose) >> nox1 -- ofsw1 ----------------- ofsw2 -- nox2 >> |--- host1 >> |--- host2 >> >> 1. Suppose we add 1 OpenFlow switch (ofsw2) and 1 NOX (nox2), >> let this ofsw2 connects to nox2 and sw1. The LLDP will let >> nox1 discover ofsw1, how let nox1 also discovery ofsw2? >> 2. Does nox1 could discover nox2? >> 3. The packages between ofsw1 and ofsw2 are using OpenFlow >> protocol? And how about nox1 and nox2? >> >> Thanks >> Bests, >> >> JW >> >> ------------------------------------------------------------------------ >> >> _______________________________________________ >> nox-dev mailing list >> [email protected] <mailto:[email protected]> >> >> http://noxrepo.org/mailman/listinfo/nox-dev_noxrepo.org >> >> >> >> >
_______________________________________________ nox-dev mailing list [email protected] http://noxrepo.org/mailman/listinfo/nox-dev_noxrepo.org
