[pox-dev] Help "In installing flow entries in switch "

[zainab qurani]

Sir
    I am referencing to the code given below to attach flow entries in
switch.But it is showing some errors like undefined variable.So what steps
should be followed to remove this errors.
   Is there any other way already in POX to install flow entries.

CODE::

def create_flow_install_msg(ip, table, mask, srcMac, dstMac, dstPort):

     ofm = ofp_flow_mod()

     ofm_match_dl(ofm, OFPFW_DL_TYPE, 0x0800)

     if (MATCH_L2):

             ofm_match_dl(ofm, OFPFW_DL_DST, srcMac)

     ofm.match.set_nw_dst(ip)

     ofm.priority = OFP_DEFAULT_PRIORITY + mask

     ofm.command = 1 #(OFPFC_ADD)

     if (mask == 32):

         ofm.idle_timeout = 300

     else:

         ofm.idle_timeout = OFP_FLOW_PERMANENT

     ofm.hard_timeout = OFP_FLOW_PERMANENT

     ofm.out_port = OFPP_NONE


ofm.actions.append(ofp_action_dl_addr(type=OFPAT_SET_DL_SRC,dl_addr=EthAddr(srcMac)))


ofm.actions.append(ofp_action_dl_addr(type=OFPAT_SET_DL_DST,dl_addr=EthAddr(dstMac)))


#ofm.actions.append(ofp_action_tp_port(type=OFPAT_SET_TP_DST,tp_port=20005))

     ofm.actions.append(ofp_action_output(port=dstPort))

     return ofm