I have copied the function send_lldp_packet() from
*ryu/topology/switches.py.*The only addition that I have done to the
function is to add a print statement.Now If I were to run the controller
using
* sudo ryu-manager --observe-links ryu/app/simple_switch.py*
and
make the mininet topology connect to the controller I don't see the print
*('send_lldp_packet')* coming on the screen.
I was told that the topology is cached in some structure by RYU.It would be
great if someone could point me to the structure?
def send_lldp_packet(self, port):
try:
port_data = self.ports.lldp_sent(port)
except KeyError as e:
# ports can be modified during our sleep in self.lldp_loop()
# LOG.debug('send_lldp: KeyError %s', e)
return
if port_data.is_down:
return
print('send_lldp_packet')
dp = self.dps.get(port.dpid, None)
if dp is None:
# datapath was already deleted
return
# LOG.debug('lldp sent dpid=%s, port_no=%d', dp.id, port.port_no)
# TODO:XXX
if dp.ofproto.OFP_VERSION == ofproto_v1_0.OFP_VERSION:
actions = [dp.ofproto_parser.OFPActionOutput(port.port_no)]
dp.send_packet_out(actions=actions, data=port_data.lldp_data)
elif dp.ofproto.OFP_VERSION >= ofproto_v1_2.OFP_VERSION:
actions = [dp.ofproto_parser.OFPActionOutput(port.port_no)]
out = dp.ofproto_parser.OFPPacketOut(
datapath=dp, in_port=dp.ofproto.OFPP_CONTROLLER,
buffer_id=dp.ofproto.OFP_NO_BUFFER, actions=actions,
data=port_data.lldp_data)
dp.send_msg(out)
else:
LOG.error('cannot send lldp packet. unsupported version. %x',
dp.ofproto.OFP_VERSION)
Regards,
Karthik.
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