def _port_added(self, port):
"""
Adds the port to a list of ports used to
connect two switches.
"""
lldp_data = LLDPPacket.lldp_packet(
port.dpid, port.port_no, port.hw_addr, self.DEFAULT_TTL)
self.ports.add_port(port, lldp_data)
def _lldp_handler(self, msg):
"""
Will react to LLDP packets by parsing then and creating
events so that the controller knows to update its topology
representation.
"""
try:
# Attempt to parse the packet as an LLDP packet
# Will fail if it is not an LLDP packet
src_dpid, src_port_no = LLDPPacket.lldp_parse(msg.data)
except LLDPPacket.LLDPUnknownFormat as e:
# This handler can receive all the packtes which can be
# not-LLDP packet. Ignore it silently
#print("Not LLDP Packet")
return
dst_dpid = msg.datapath.id
if msg.datapath.ofproto.OFP_VERSION == ofproto_v1_0.OFP_VERSION:
dst_port_no = msg.in_port
elif msg.datapath.ofproto.OFP_VERSION >= ofproto_v1_2.OFP_VERSION:
dst_port_no = msg.match['in_port']
else:
LOG.error('cannot accept LLDP. unsupported version. %x',
msg.datapath.ofproto.OFP_VERSION)
src = self._get_port(src_dpid, src_port_no)
if not src or src.dpid == dst_dpid:
return
try:
self.ports.lldp_received(src)
except KeyError:
# There are races between EventOFPPacketIn and
# EventDPPortAdd. So packet-in event can happend before
# port add event. In that case key error can happend.
# LOG.debug('lldp_received: KeyError %s', e)
pass
dst = self._get_port(dst_dpid, dst_port_no)
if not dst:
return
old_peer = self.links.get_peer(src)
if old_peer and old_peer != dst:
old_link = Link(src, old_peer)
self.send_event_to_observers(event.EventLinkDelete(old_link))
link = Link(src, dst)
if link not in self.links:
self.send_event_to_observers(event.EventLinkAdd(link))
if src_dpid not in self.switch_ports:
self.switch_ports[src_dpid] = []
if src_port_no not in self.switch_ports[src_dpid]:
self.switch_ports[src_dpid].append(src_port_no)
if dst_dpid not in self.switch_ports:
self.switch_ports[dst_dpid] = []
if dst_port_no not in self.switch_ports[dst_dpid]:
self.switch_ports[dst_dpid].append(dst_port_no)
if not self.links.update_link(src, dst):
self.ports.move_front(dst)
self.lldp_event.set()