I have slightly modified the simple_switch.py to print out switch and link
information using
ryu.topology.api.get_all_switch(switch)
AND
ryu.topology.api.get_all_link(switch)
The above two functions are defined in ryu/topology/api.py
{noformat}
@set_ev_cls(ofp_event.EventOFPPacketIn, MAIN_DISPATCHER)
def _packet_in_handler(self, ev):
sw_list = ryu.topology.api.get_all_switch(self)
print('sw_list {}'.format(sw_list))
link_list = ryu.topology.api.get_all_link(self)
print('link_list {}'.format(link_list))
msg = ev.msg
datapath = msg.datapath
ofproto = datapath.ofproto
pkt = packet.Packet(msg.data)
eth = pkt.get_protocol(ethernet.ethernet)
dst = eth.dst
src = eth.src
dpid = datapath.id
self.mac_to_port.setdefault(dpid, {})
self.logger.info("packet in %s %s %s %s", dpid, src, dst,
msg.in_port)
# learn a mac address to avoid FLOOD next time.
self.mac_to_port[dpid][src] = msg.in_port
if dst in self.mac_to_port[dpid]:
out_port = self.mac_to_port[dpid][dst]
else:
out_port = ofproto.OFPP_FLOOD
actions = [datapath.ofproto_parser.OFPActionOutput(out_port)]
# install a flow to avoid packet_in next time
if out_port != ofproto.OFPP_FLOOD:
self.add_flow(datapath, msg.in_port, dst, actions)
out = datapath.ofproto_parser.OFPPacketOut(
datapath=datapath, buffer_id=msg.buffer_id, in_port=msg.in_port,
actions=actions)
datapath.send_msg(out)
{noformat}
The output comes as given below.
{noformat}
packet in 514 b6:0f:50:40:93:46 33:33:00:00:00:02 2
sw_list [<ryu.topology.switches.Switch object at 0x305ae90>,
<ryu.topology.switches.Switch object at 0x305a2d0>,
<ryu.topology.switches.Switch object at 0x305e110>,
<ryu.topology.switches.Switch object at 0x305e710>,
<ryu.topology.switches.Switch object at 0x305ee50>,
<ryu.topology.switches.Switch object at 0x305e310>]
link_list {}
packet in 516 42:1b:2f:bf:68:8b 33:33:00:00:00:fb 2
sw_list [<ryu.topology.switches.Switch object at 0x305a7d0>,
<ryu.topology.switches.Switch object at 0x305a1d0>,
<ryu.topology.switches.Switch object at 0x305ea50>,
<ryu.topology.switches.Switch object at 0x305e350>,
<ryu.topology.switches.Switch object at 0x305e810>,
<ryu.topology.switches.Switch object at 0x305ed90>]
link_list {}
packet in 515 f2:35:74:66:d9:f9 33:33:00:00:00:fb 2
sw_list [<ryu.topology.switches.Switch object at 0x305a2d0>,
<ryu.topology.switches.Switch object at 0x305ee50>,
<ryu.topology.switches.Switch object at 0x305e510>,
<ryu.topology.switches.Switch object at 0x305ed50>,
<ryu.topology.switches.Switch object at 0x305e690>,
<ryu.topology.switches.Switch object at 0x305e150>]
link_list {}
packet in 513 16:ef:fb:99:1b:96 33:33:00:00:00:fb 2
sw_list [<ryu.topology.switches.Switch object at 0x305a2d0>,
<ryu.topology.switches.Switch object at 0x305e810>,
<ryu.topology.switches.Switch object at 0x305ed90>,
<ryu.topology.switches.Switch object at 0x305e610>,
<ryu.topology.switches.Switch object at 0x305ebd0>,
<ryu.topology.switches.Switch object at 0x305e310>]
link_list {}
packet in 514 b6:0f:50:40:93:46 33:33:00:00:00:fb 2
sw_list [<ryu.topology.switches.Switch object at 0x305ab90>,
<ryu.topology.switches.Switch object at 0x305ec90>,
<ryu.topology.switches.Switch object at 0x305e150>,
<ryu.topology.switches.Switch object at 0x305ecd0>,
<ryu.topology.switches.Switch object at 0x305e710>,
<ryu.topology.switches.Switch object at 0x305e7d0>]
link_list {}
packet in 517 7a:de:82:e7:0b:e5 33:33:00:00:00:fb 2
sw_list [<ryu.topology.switches.Switch object at 0x305e3d0>,
<ryu.topology.switches.Switch object at 0x305ed50>,
<ryu.topology.switches.Switch object at 0x305e1d0>,
<ryu.topology.switches.Switch object at 0x305e510>,
<ryu.topology.switches.Switch object at 0x305e350>,
<ryu.topology.switches.Switch object at 0x305eb90>]
link_list {}
{noformat}
ryu.topology.api.get_all_switch(switch) correctly seems to return the
switch information
ryu.topology.api.get_all_link(switch) doesn't seem to return any link
information as I would expect.?
What is the reason for this?
Thanks & Regards,
Karthik.
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