Hi,
I ask you for some help relating to the topology-modul of
Ryu. I wrote a simple app, which is supposed to give me
the complete topology of the network (a connected mininet
network), by listing all switches and links. The problem
is, that i have to use a trick to get all of the links, by
specifing, that the number of links is complete if it
corresponds to the number of switches+1. This works
because every links is recorded twice, as it has two
directions and i'm using a tree-topology. My example
program is attached below and started with PYTHONPATH=.
./bin/ryu-manager --observe-links ryu/app/topotester.py
The rest_topology.py app just works fine for me and gives
me all the links by first reqeust, which is what I hope to
realize with my application.
Kind regards, Chris
from ryu.base import app_manager
from ryu.controller import ofp_event
from ryu.controller.handler import MAIN_DISPATCHER
from ryu.controller.handler import CONFIG_DISPATCHER
from ryu.controller.handler import set_ev_cls
from ryu.topology import switches
from ryu.topology.switches import get_switch, get_link
class topotester(app_manager.RyuApp):
_CONTEXTS = {
'switches': switches.Switches
}
def __init__(self, *args, **kwargs):
super(topotester, self).__init__(*args, **kwargs)
self.switches = kwargs['switches']
self.topology_unknown = True
self.number_of_switches = 0
self.number_of_links = 0
def list_switches(self):
dpid = None
switch_list = get_switch(self.switches, dpid)
for switch in switch_list:
print switch.to_dict()
print "DEBUG: Number of Switches:",
len(switch_list)
if self.topology_unknown:
self.number_of_switches = len(switch_list)
def list_links(self):
dpid = None
links = get_link(self.switches, dpid)
for link in links:
print link.to_dict()
print "DEBUG: Number of Links:", len(links)
self.number_of_links = len(links)
@set_ev_cls(ofp_event.EventOFPPacketIn,
MAIN_DISPATCHER)
def packet_in_handler(self, ev):
msg = ev.msg
dp = msg.datapath
ofp = dp.ofproto
ofp_parser = dp.ofproto_parser
if self.topology_unknown==True:
print "Switches:"
self.list_switches()
print
"---------------------------------------------------"
print "Links:"
self.list_links()
print
"---------------------------------------------------"
if self.number_of_links ==
self.number_of_switches+1:
self.topology_unknown=False
------------------------------------------------------------------------------
Introducing Performance Central, a new site from SourceForge and
AppDynamics. Performance Central is your source for news, insights,
analysis and resources for efficient Application Performance Management.
Visit us today!
http://pubads.g.doubleclick.net/gampad/clk?id=48897511&iu=/4140/ostg.clktrk
_______________________________________________
Ryu-devel mailing list
[email protected]
https://lists.sourceforge.net/lists/listinfo/ryu-devel
