Hi all,
I have some problem to understand some conditions in the nox example
'pyswitch'.
*My first question is that when a packet_in_event is received by the
controller, the 'inport' parameter designs the port of controller that
received the packet from the switch or the port of the switch that
received the packet.
Than, in the following code:
"def forward_l2_packet(dpid, inport, packet, buf, bufid):
dstaddr = packet.dst.tostring()
if not ord(dstaddr[0]) & 1 and inst.st[dpid].has_key(dstaddr):
prt = inst.st[dpid][dstaddr]
if prt[0] == inport:
log.err('**warning** learned port = inport',
system="ppp_switch")
inst.send_openflow(dpid, bufid, buf, openflow.OFPP_FLOOD,
inport)
else:
# We know the outport, set up a flow
log.msg('installing flow for ' + str(packet),
system="ppp_switch")
flow = extract_flow(packet)
flow[core.IN_PORT] = inport
actions = [[openflow.OFPAT_OUTPUT, [0, prt[0]]]]
inst.install_datapath_flow(dpid, flow, CACHE_TIMEOUT,
actions, bufid,
openflow.OFP_DEFAULT_PRIORITY,
inport, buf)
else:
# haven't learned destination MAC. Flood
inst.send_openflow(dpid, bufid, buf, openflow.OFPP_FLOOD, inport)
"
why do we compare the prt[0] to the inport and why do we do a
inst.send_openflow(dpid, bufid, buf, openflow.OFPP_FLOOD, inport) when
they are equal but we do inst.install_datapath_flow(dpid, flow,
CACHE_TIMEOUT, actions, bufid, openflow.OFP_DEFAULT_PRIORITY, inport,
buf) when they are different.
Thanks a lot and sorry for bothering with those basic questions.
Regards,
Karim
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