Well, I found LLDP generation code in "*ryu.topology.switches*" and it is
working now. I had a lot of problems in TLVs definitions. Also, I used
Python3.6 default encoding "UTF-8" which should be "ASCII".
this is the current send_lldp:
> def send_lldp(self, datapath: Datapath):
> ports = self.dpset.get_ports(datapath.id)
> for port in ports:
> pkt = packet.Packet()
> pkt.add_protocol(ethernet.ethernet(
> ethertype=ethernet.ether.ETH_TYPE_LLDP,
> dst="01:80:C2:00:00:02",
> src=port.hw_addr
> ))
> tlv_chassis_id = lldp.ChassisID(
> subtype=lldp.ChassisID.SUB_LOCALLY_ASSIGNED,
> chassis_id=(LLDPPacket.CHASSIS_ID_FMT %
> dpid_to_str(datapath.id)).encode('ascii'))
> tlv_port_id =
lldp.PortID(subtype=lldp.PortID.SUB_PORT_COMPONENT,
> port_id=struct.pack(
> LLDPPacket.PORT_ID_STR,
> port.port_no))
> tlv_ttl = lldp.TTL(ttl=15)
> tlv_end = lldp.End()
> tlvs = (tlv_chassis_id, tlv_port_id, tlv_ttl, tlv_end)
> lldp_pkt = lldp.lldp(tlvs)
> pkt.add_protocol(lldp_pkt)
> self._send_packet(datapath, port.port_no, pkt)
On Tue, Feb 19, 2019 at 1:27 PM Maged Motawea <[email protected]>
wrote:
> Dear sir,
>
> I'm using ryu to generate LLDP packets and send them out of all switch
> ports using this code:
>
> > def send_lldp(self, datapath):
> > ports = self.dpset.get_ports(datapath.id)
> > for port in ports:
> > pkt = packet.Packet()
> > pkt.add_protocol(ethernet.ethernet(
> > ethertype=ethernet.ether.ETH_TYPE_LLDP,
> > dst="01:80:C2:00:00:02",
> > src=port.hw_addr
> > ))
> > pkt.add_protocol(lldp.lldp(
> > [
> >
> > lldp.ChassisID(chassis_id=dpid_to_str(datapath.id).encode(),
> subtype=lldp.ChassisID.SUB_CHASSIS_COMPONENT),
> > lldp.PortID(port_id=port.name,
> subtype=lldp.PortID.SUB_INTERFACE_NAME),
> > ]
> > ))
> > try:
> > self._send_packet(datapath, port.port_no, pkt)
> > except Exception as e:
> > print(str(e))
>
>
> I've added a rule to forward packets to the controller in case of LLDP
> match:
> > parser.OFPMatch(
> > eth_type=ethernet.ether.ETH_TYPE_LLDP
> > )
>
>
> but when the packets are received by the controller as PacketIn messages
> I'm unable to get LLDP headers. this is the code I'm using for PacketIn:
>
> > @set_ev_cls(ofp_event.EventOFPPacketIn, MAIN_DISPATCHER)
> > def _packet_in_handler(self, ev):
> > msg = ev.msg
> > datapath = msg.datapath
> > port = msg.match['in_port']
> > pkt = packet.Packet(msg.data)
> > self.logger.info("packet-in %s" % (pkt,))
> > pkt_ethernet = pkt.get_protocol(ethernet.ethernet)
> > if not pkt_ethernet:
> > return
> > pkt_lldp = pkt.get_protocol(lldp.lldp)
> > if pkt_lldp:
> > self._handle_lldp(datapath, port, pkt_ethernet, pkt_lldp)
>
> pkt_lldp is None and the value of pkt.protocols is:
> >
> [ethernet(dst='01:80:c2:00:00:02',ethertype=35020,src='d2:7d:8f:dd:c8:bd'),
> b'\x02\x11\x010000ba8f9ab84c4c\x04\x07\x05p1-sw2\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00']
>
>
> Best Regards,
> Maged
>
>
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