def create_discovery_packet(dpid, portno, ttl_):
# Create lldp packet
discovery_packet = lldp()
cid = chassis_id()
# nbo
cid.fill(4, array.array('B', struct.pack('!Q', dpid))[2:8])
discovery_packet.add_tlv(cid)
pid = port_id()
pid.fill(2, array.array('B', struct.pack('!H', portno)))
discovery_packet.add_tlv(pid)
ttlv = ttl()
ttlv.fill(ttl_)
discovery_packet.add_tlv(ttlv)
discovery_packet.add_tlv(end_tlv())
eth = ethernet()
# To insure that the LLDP src mac address is not a multicast
# address, since we have no control on choice of dpid
eth.src = '\x00' + struct.pack('!Q', dpid)[3:8]
eth.dst = NDP_MULTICAST
eth.set_payload(discovery_packet)
eth.type = ethernet.LLDP_TYPE
return eth
def create_discovery_packet(dpid, portno, ttl_):
# Create lldp packet
discovery_packet = lldp()
cid = chassis_id()
# nbo
cid.fill(chassis_id.SUB_LOCAL, array.array('B', 'dpid:' + hex(long(dpid))[2:-1]))
discovery_packet.add_tlv(cid)
pid = port_id()
pid.fill(2,array.array('B',struct.pack('!H', portno)))
discovery_packet.add_tlv(pid)
ttlv = ttl()
ttlv.fill(ttl_)
discovery_packet.add_tlv(ttlv)
discovery_packet.add_tlv(end_tlv())
eth = ethernet()
# To insure that the LLDP src mac address is not a multicast
# address, since we have no control on choice of dpid
eth.src = '\x00' + struct.pack('!Q',dpid)[3:8]
eth.dst = NDP_MULTICAST
eth.set_payload(discovery_packet)
eth.type = ethernet.LLDP_TYPE
return eth
def create_discovery_packet(dpid, portno, vlan_id, ttl_):
# Create lldp packet
discovery_packet = lldp()
cid = chassis_id()
# nbo
cid.fill(chassis_id.SUB_LOCAL, array.array('B', 'dpid:' + hex(long(dpid))[2:-1]))
discovery_packet.add_tlv(cid)
pid = port_id()
pid.fill(2,array.array('B',struct.pack('!H', portno)))
discovery_packet.add_tlv(pid)
ttlv = ttl()
ttlv.fill(ttl_)
discovery_packet.add_tlv(ttlv)
discovery_packet.add_tlv(end_tlv())
eth = ethernet()
eth.src = '\x00' + struct.pack('!Q',dpid)[3:8]
eth.dst = NDP_MULTICAST
if(vlan_id != None):
vlan_packet = vlan()
vlan_packet.id = vlan_id
vlan_packet.pcp = 0
vlan_packet.c = 0
vlan_packet.eth_type = ethernet.LLDP_TYPE
vlan_packet.set_payload(discovery_packet)
eth.set_payload(vlan_packet)
eth.type = ethernet.VLAN_TYPE
eth.eth_type = ethernet.LLDP_TYPE
else:
eth.set_payload(discovery_packet)
eth.type = ethernet.LLDP_TYPE
return eth
def create_discovery_packet(dpid, hwaddr, portno, ttl_):
# Create lldp packet
discovery_packet = lldp()
cid = chassis_id()
# nbo
cid.fill(chassis_id.SUB_NETWORK, array.array('B', struct.pack('!Q', dpid)))
discovery_packet.add_tlv(cid)
pid = port_id()
pid.fill(2, array.array('B', struct.pack('!H', portno)))
discovery_packet.add_tlv(pid)
ttlv = ttl()
ttlv.fill(ttl_)
discovery_packet.add_tlv(ttlv)
discovery_packet.add_tlv(end_tlv())
eth = ethernet()
# Ideally, LLDPs sent out of a port shud have its hwaddr. But,
# if the switch is reporting MAC address same as DPID, then we
# shud distinguish from it using local MAC addr. This also
# insures that the LLDP src mac addr is not a multicast addr.
if hwaddr == struct.pack('!Q', dpid)[2:8]:
eth.src = struct.pack('!Q', dpid | 0x020000000000)[2:8]
else:
eth.src = hwaddr
eth.dst = NDP_MULTICAST
eth.set_payload(discovery_packet)
eth.type = ethernet.LLDP_TYPE
return eth
def create_discovery_packet(dpid, hwaddr, portno, ttl_):
# Create lldp packet
discovery_packet = lldp()
cid = chassis_id()
# nbo
cid.fill(chassis_id.SUB_NETWORK, array.array('B', struct.pack('!Q',dpid)))
discovery_packet.add_tlv(cid)
pid = port_id()
pid.fill(2,array.array('B',struct.pack('!H', portno)))
discovery_packet.add_tlv(pid)
ttlv = ttl()
ttlv.fill(ttl_)
discovery_packet.add_tlv(ttlv)
discovery_packet.add_tlv(end_tlv())
eth = ethernet()
# Ideally, LLDPs sent out of a port shud have its hwaddr. But,
# if the switch is reporting MAC address same as DPID, then we
# shud distinguish from it using local MAC addr. This also
# insures that the LLDP src mac addr is not a multicast addr.
if hwaddr == struct.pack('!Q',dpid)[2:8]:
eth.src = struct.pack('!Q', dpid | 0x020000000000)[2:8]
else:
eth.src = hwaddr
eth.dst = NDP_MULTICAST
eth.set_payload(discovery_packet)
eth.type = ethernet.LLDP_TYPE
return eth
