Thank you very much, Mr Zarifis! Do you have any NOX code that handle the message OFPPR_MODIFY. Or openflow switch code that handle link_event.
So I can follow it to implement in my system. Best regard! Trinh Minh Tri On Tue, Mar 27, 2012 at 4:01 PM, Kyriakos Zarifis <[email protected]>wrote: > If a link/port is administratively down, the should should send a Port > Status change message with reason OFPPR_MODIFY (5.4.3 in the > specification<http://www.openflow.org/documents/openflow-spec-v1.0.0.pdf> > ) > These message will not necessarily always be sent when a link is > unavailable. > > While I don't think there is a standard way to specify if a link is > functioning with a 100% guarantee, another technique one could use is some > discovery process. For example, the component 'discovery' periodically > sends LLDP message between neighboring switch to verify connectivity, and > if one/some of them don't make it across, the component will raise a > link_event declaring that it thinks it's down (Keep in mind that this is > not openflow specific but rather it is a controller functionality) > > > On Tue, Mar 27, 2012 at 11:38 AM, Trinh Minh Tri <[email protected]>wrote: > >> Dear NOX dev! >> >> I would like to ask when there is a link down in openflow switch, what >> kind of openflow message that openflow switch will send to NOX? >> And do you have any code that NOX handle this kind of message? >> >> Thank you >> Trinh Minh Tri >> >> >
