OK, got it
Thank you
Zhao Jun
From: [email protected]
To: [email protected]
CC: [email protected]
Subject: Re: [Ryu-devel] [maybe a bug] dpset : multiple connections
Date: Sat, 16 Jan 2016 04:10:13 +0000
On Jan 15, 2016, at 10:24 PM, 俊 赵 <[email protected]> wrote:
from ryu.base import app_manager
from ryu.controller import ofp_event
from ryu.controller.handler import CONFIG_DISPATCHER, MAIN_DISPATCHER
from ryu.controller.handler import set_ev_cls
from ryu.controller.dpset import EventDPReconnected
@set_ev_cls(EventDPReconnected) def _switch_reconnected_handler(self, ev):
print ev
So...you’re missing an argument to the set_ev_cls decorator.
My code to use that event looks like this:
@set_ev_cls(dpset.EventDPReconnected, dpset.DPSET_EV_DISPATCHER)
def datapath_change_handler(self, ev):
PlexusController.router_datapath_change_handler(ev.dp)
The second thing you should keep in mind:
That event is intended for a very specific case - one in which a given datapath
has disconnected, but, for whatever reason, Ryu has not noticed it yet.
Due to the nature of this event, an application may want to handle this case
specially.
The switch may have flows programmed into it that the application author wants
to leave undisturbed; these flows could be inspected in a handler that issues a
FlowStatsRequest.
Similarly, the author may take a cautious approach, and just clear all flows
from the switch before re-programming them all.
Regardless - a switch re-connecting is a distinct event from a switch that has
newly connected - meaning that Ryu has no internal state representing it.
I have not yet begun trying to port my application to using ryu.topology - so I
cannot really help you there; sorry.
Hope that helps,
Victor
--
Victor J. Orlikowski <> vjo@[cs.]duke.edu
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