> I have slightly modified the simple_switch.py to print out switch and link
> information using
>
> ryu.topology.api.get_all_switch(switch)
> AND
> ryu.topology.api.get_all_link(switch)
>
> The above two functions are defined in ryu/topology/api.py
>
> {noformat}
> @set_ev_cls(ofp_event.EventOFPPacketIn, MAIN_DISPATCHER)
> def _packet_in_handler(self, ev):
> sw_list = ryu.topology.api.get_all_switch(self)
> print('sw_list {}'.format(sw_list))
> link_list = ryu.topology.api.get_all_link(self)
> print('link_list {}'.format(link_list))
>
> msg = ev.msg
> datapath = msg.datapath
> ofproto = datapath.ofproto
>
> pkt = packet.Packet(msg.data)
> eth = pkt.get_protocol(ethernet.ethernet)
>
> dst = eth.dst
> src = eth.src
>
> dpid = datapath.id
> self.mac_to_port.setdefault(dpid, {})
>
> self.logger.info("packet in %s %s %s %s", dpid, src, dst,
> msg.in_port)
>
> # learn a mac address to avoid FLOOD next time.
> self.mac_to_port[dpid][src] = msg.in_port
>
> if dst in self.mac_to_port[dpid]:
> out_port = self.mac_to_port[dpid][dst]
> else:
> out_port = ofproto.OFPP_FLOOD
>
> actions = [datapath.ofproto_parser.OFPActionOutput(out_port)]
>
> # install a flow to avoid packet_in next time
> if out_port != ofproto.OFPP_FLOOD:
> self.add_flow(datapath, msg.in_port, dst, actions)
>
> out = datapath.ofproto_parser.OFPPacketOut(
> datapath=datapath, buffer_id=msg.buffer_id, in_port=msg.in_port,
> actions=actions)
> datapath.send_msg(out)
> {noformat}
>
> The output comes as given below.
>
> {noformat}
> packet in 514 b6:0f:50:40:93:46 33:33:00:00:00:02 2
> sw_list [<ryu.topology.switches.Switch object at 0x305ae90>,
> <ryu.topology.switches.Switch object at 0x305a2d0>,
> <ryu.topology.switches.Switch object at 0x305e110>,
> <ryu.topology.switches.Switch object at 0x305e710>,
> <ryu.topology.switches.Switch object at 0x305ee50>,
> <ryu.topology.switches.Switch object at 0x305e310>]
> link_list {}
> packet in 516 42:1b:2f:bf:68:8b 33:33:00:00:00:fb 2
> sw_list [<ryu.topology.switches.Switch object at 0x305a7d0>,
> <ryu.topology.switches.Switch object at 0x305a1d0>,
> <ryu.topology.switches.Switch object at 0x305ea50>,
> <ryu.topology.switches.Switch object at 0x305e350>,
> <ryu.topology.switches.Switch object at 0x305e810>,
> <ryu.topology.switches.Switch object at 0x305ed90>]
> link_list {}
> packet in 515 f2:35:74:66:d9:f9 33:33:00:00:00:fb 2
> sw_list [<ryu.topology.switches.Switch object at 0x305a2d0>,
> <ryu.topology.switches.Switch object at 0x305ee50>,
> <ryu.topology.switches.Switch object at 0x305e510>,
> <ryu.topology.switches.Switch object at 0x305ed50>,
> <ryu.topology.switches.Switch object at 0x305e690>,
> <ryu.topology.switches.Switch object at 0x305e150>]
> link_list {}
> packet in 513 16:ef:fb:99:1b:96 33:33:00:00:00:fb 2
> sw_list [<ryu.topology.switches.Switch object at 0x305a2d0>,
> <ryu.topology.switches.Switch object at 0x305e810>,
> <ryu.topology.switches.Switch object at 0x305ed90>,
> <ryu.topology.switches.Switch object at 0x305e610>,
> <ryu.topology.switches.Switch object at 0x305ebd0>,
> <ryu.topology.switches.Switch object at 0x305e310>]
> link_list {}
> packet in 514 b6:0f:50:40:93:46 33:33:00:00:00:fb 2
> sw_list [<ryu.topology.switches.Switch object at 0x305ab90>,
> <ryu.topology.switches.Switch object at 0x305ec90>,
> <ryu.topology.switches.Switch object at 0x305e150>,
> <ryu.topology.switches.Switch object at 0x305ecd0>,
> <ryu.topology.switches.Switch object at 0x305e710>,
> <ryu.topology.switches.Switch object at 0x305e7d0>]
> link_list {}
> packet in 517 7a:de:82:e7:0b:e5 33:33:00:00:00:fb 2
> sw_list [<ryu.topology.switches.Switch object at 0x305e3d0>,
> <ryu.topology.switches.Switch object at 0x305ed50>,
> <ryu.topology.switches.Switch object at 0x305e1d0>,
> <ryu.topology.switches.Switch object at 0x305e510>,
> <ryu.topology.switches.Switch object at 0x305e350>,
> <ryu.topology.switches.Switch object at 0x305eb90>]
> link_list {}
> {noformat}
>
> ryu.topology.api.get_all_switch(switch) correctly seems to return the
> switch information
>
>
> ryu.topology.api.get_all_link(switch) doesn't seem to return any link
> information as I would expect.?
do you have --observe-links?
eg. ryu-manager --observe-links ryu.app.rest_topology
YAMAMOTO Takashi
>
> What is the reason for this?
>
> Thanks & Regards,
> Karthik.
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