Hi,
I have some questions to ask.
First, I see in the newest ryu version, there is an event called
EventDPReconnected in ryu.controller.dpset.
I want to handle this event, using following code, is it right?
from ryu.base import app_managerfrom ryu.controller import ofp_eventfrom
ryu.controller.handler import CONFIG_DISPATCHER, MAIN_DISPATCHERfrom
ryu.controller.handler import set_ev_clsfrom ryu.controller.dpset import
EventDPReconnected
@set_ev_cls(EventDPReconnected)
def _switch_reconnected_handler(self, ev):
print ev
Second, I am using ryu.topology to receive the event of swtich entering or
leaving the network.
from ryu.topology import api as topo_api
from ryu.topology import event as topo_event
@set_ev_cls(topo_event.EventSwitchEnter)
def _switch_enter_handler(self, ev): console.info("enter an openflow
switch with datapath -
"+str(ev.switch.dp.id))@set_ev_cls(topo_event.EventSwitchLeave)
def _switch_leave_handler(self, ev):
console.info("leave an openflow switch with datapath -
"+str(ev.switch.dp.id))
But I encountered a problem. It seems that when ryu shows warning message with
multiple messages, it will trigger EventSwitchLeave twice, and the second will
show error with "AttributeError: 'NoneType' object has no attribute 'dp'"!
Here is how to hit the problem.
1) create a switch connecting with ryu, and shutdown the switch. Warning: not
using reboot command to shutdown, just pull off the power supply.2) restart the
switch, and this will cause multiple warnings3) also, this will trigger
EventSwitchLeave twice, and the second will show the error
Thanks!
Zhao Jun ------------------------------------------------------------------------------
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