Have you read the second entry in the POX FAQ?
-- Murphy
On Mar 9, 2015, at 11:07 PM, Sandesh Shrestha <sande...@ualberta.ca> wrote:
> Hello All,
>
>
> I am having a problem with installing flow entry
> I am getting error: Fields ignored due to unspecified prerequisites
> DEBUG:libopenflow_01:Problematic match: ofp_match
> wildcards:
> nw_tos|tp_dst|dl_dst|dl_src|in_port|dl_vlan_pcp|nw_proto|dl_vlan|tp_src|dl_type|nw_src(/0)
> (1100000010000011111111 = 3020ff)
> nw_dst: 10.0.0.10
>
> Does anyone have any idea why this is happening ?
>
> I am using the following code.
>
>
> from pox.core import core
> import pox.openflow.libopenflow_01 as of
> import pox.lib.packet as pkt
> from pox.lib.addresses import EthAddr,IPAddr
> import time
>
> log= core.getLogger()
>
>
> class Icmp(object):
> def __init__(self,connection):
> core.openflow.addListeners(self)
> self.connection=connection
>
> def _handle_PacketIn(self,event):
> packet=event.parsed
> log.debug(packet)
>
> if packet.find("arp"):
> log.debug("ARP Message Received")
>
> if packet.find("icmp"):
> log.debug("Icmp message received")
>
> def _handle_ConnectionUp(self,event):
>
> #Install Flows
>
> msg = of.ofp_flow_mod()
> msg.match.nw_dst = IPAddr("10.0.0.10")
> msg.actions.append(of.ofp_action_output(port = 3))
> self.connection.send(msg)
> log.debug("Installing flow for future packet processing")
>
>
> def launch():
>
> def start_switch(event):
> log.debug("Controlling %s"%(event.connection))
> Icmp(event.connection)
> core.openflow.addListenerByName("ConnectionUp",start_switch)
>
> Thanks,
> Sandesh Shrestha
