def setUp(self):
self.protocol_id = bpdu.PROTOCOL_IDENTIFIER
self.version_id = bpdu.TopologyChangeNotificationBPDUs.VERSION_ID
self.bpdu_type = bpdu.TopologyChangeNotificationBPDUs.BPDU_TYPE
self.msg = bpdu.TopologyChangeNotificationBPDUs()
self.fmt = bpdu.bpdu._PACK_STR
self.buf = struct.pack(self.fmt, self.protocol_id, self.version_id,
self.bpdu_type)
def _generate_tcn_bpdu(self):
src_mac = self.ofport.hw_addr
dst_mac = bpdu.BRIDGE_GROUP_ADDRESS
length = (bpdu.bpdu._PACK_LEN
+ bpdu.TopologyChangeNotificationBPDUs.PACK_LEN
+ llc.llc._PACK_LEN + llc.ControlFormatU._PACK_LEN)
e = ethernet.ethernet(dst_mac, src_mac, length)
l = llc.llc(llc.SAP_BPDU, llc.SAP_BPDU, llc.ControlFormatU())
b = bpdu.TopologyChangeNotificationBPDUs()
pkt = packet.Packet()
pkt.add_protocol(e)
pkt.add_protocol(l)
pkt.add_protocol(b)
pkt.serialize()
return pkt.data