Hi, Thanks for your reply. It's possible openflow messages across several switches until achieve the controller? Such as host -> sw1 -> sw2 -> sw3 -> c0 or in a reverse way in linear topology? Consider that the host packet need to achieve a server connected to sw3 and there are only one controller linked to one switch.
-- scolf On Thu, Oct 20, 2011 at 06:32, Kyriakos Zarifis <kyr.zari...@gmail.com>wrote: > Hi, > > pyswitch itself is really not aware of any topology. It only stores state > that is relevant to switches separately (i.e. it stores a mapping of mac > addresses to local ports for a switch). > > Now, whether a control packet (like a packet_in) will reach the controller > if it's not directly physically connected to it is another issue, and is > irrelevant to what NOX application (eg pyswitch) is running. Switches are > connected to the controller through a separate control channel, so as long > as this channel has been established (which is when the switch first > connects to NOX), then the packet_ins will find their way to NOX through > that (irrespective of dataplane connectivity, which is established by NOX > applications) > > (another thing to consider is whether the switch-controller connection is > in-bound/out-of-bound) > > Does this make sense? > > On Wed, Oct 19, 2011 at 5:20 PM, scolfield <kscolfi...@gmail.com> wrote: > >> Hi, >> >> The pyswitch example can learn topology of networks? Such as a corporation >> architecture when >> there are hierarchical switches interconnected one to another creating >> several "layers" of switches, >> at this case, the one openflow controller connected to two distinct >> switches, can learn which ports >> to send a ping packets, for example? The packet in messages will be >> forwarded automatically through >> switches until reach a controller? >> >> -- >> scolfield >> >> _______________________________________________ >> nox-dev mailing list >> nox-dev@noxrepo.org >> http://noxrepo.org/mailman/listinfo/nox-dev >> >> >
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