def reset_flowtable(self, datapath):
# drop arp requests to avoid arp storm
match_arp_req = parser13.OFPMatch(eth_type = ETH_TYPE_ARP, arp_op = ARP_REQUEST)
of_func.ofDelFlow(datapath, match_arp_req)
# forward arp replies to the controller
match_arp_rep = parser13.OFPMatch(eth_type = ETH_TYPE_ARP, arp_op = ARP_REPLY)
of_func.ofDelFlow(datapath, match_arp_rep)
def broadcast_arp(self):
switch_list = get_switch(self, None)
# modify flows to drop temporarily arp request
match = parser13.OFPMatch(eth_dst = BROADCAST_STR, eth_type = ETH_TYPE_ARP)
actions = []
for switch in switch_list:
of_func.ofAddFlow(switch.dp, match, actions, self.ARP_BROADCAST_PRIORITY)
for switch in switch_list:
of_func.ofPckOut(self.current_msg, ofproto13.OFPP_FLOOD)
# del flows to drop arp request
for switch in switch_list:
of_func.ofDelFlow(switch.dp, match, self.ARP_BROADCAST_PRIORITY)
