hi,
probably your app did get_link before the topology app
finished discovering links.
btw can you use english subject?
the subject of this mail confused my MUA a lot.
YAMAMOTO Takashi
> hi
> my ryu is 3.19,and mininet is 2.2.0, i write a app to discovery the links. i
> start mininet firstly,and the start the ryu, but the ryu usually can not find
> the links, if i restart the ryu sereral times, it may find the correct
> links,it confused me!
> anyone can help me, my code is below:
> @set_ev_cls(event.EventSwitchEnter)
> def get_topology_data(self, ev):
> switch_list = get_switch(self.topology_api_app, None)
> switches=[switch.dp.id for switch in switch_list]
> self.net.add_nodes_from(switches)
> links_list = get_link(self.topology_api_app, None)
> links=[(link.src.dpid,link.dst.dpid,{'port':link.src.port_no}) for
> link in links_list]
> self.net.add_edges_from(links)
> links=[(link.dst.dpid,link.src.dpid,{'port':link.dst.port_no}) for
> link in links_list]
> self.net.add_edges_from(links)
> print "**********List of links"
> print self.net.edges()
> the result of running is below:
> root@john-S3210SH:/home/wyxapp# ryu-manager --observe-links shortestpath_13.py
> loading app shortestpath_13.py
> loading app ryu.topology.switches
> loading app ryu.controller.ofp_handler
> instantiating app None of DPSet
> creating context dpset
> instantiating app shortestpath_13.py of ProjectController
> instantiating app ryu.topology.switches of Switches
> instantiating app ryu.controller.ofp_handler of OFPHandler
> **********List of links
> []
> **********List of links
> []
> **********List of links
> []
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