Hi,
On Tue, 25 Mar 2014 14:53:13 -0400
"Charles F." <[email protected]> wrote:
> I have looked at some other SDN controllers (Floodlight) that allow one to
> easily get a list of links. I noticed that the MAC addresses pulled back
> from the switches are not the mac addresses of the hosts. I am doing
> everything in Mininet for testing. I can use ARP to get the MACs of hosts
> on certain ports, but for the switch-to-switch connection, how can that be
> done in Ryu?
Ryu can give the info links between switches by using LLDP (I don't
know but I guess that other controllers do the similar).
The following code needs the latest git head.
$ ryu-manager ~/a.py --observe-links
loading app /Users/fujita/a.py
loading app ryu.controller.ofp_handler
loading app ryu.topology.switches
loading app ryu.controller.ofp_handler
instantiating app None of DPSet
creating context dpset
instantiating app ryu.topology.switches of Switches
instantiating app ryu.controller.ofp_handler of OFPHandler
instantiating app /Users/fujita/a.py of OF13
Port<dpid=2, port_no=3, LIVE> Port<dpid=1, port_no=1, LIVE>
46:a1:59:ee:16:15
Port<dpid=1, port_no=2, LIVE> Port<dpid=3, port_no=3, LIVE>
66:06:74:41:20:b8
Port<dpid=1, port_no=1, LIVE> Port<dpid=2, port_no=3, LIVE>
4a:8c:a6:3d:c2:d6
Port<dpid=3, port_no=3, LIVE> Port<dpid=1, port_no=2, LIVE>
32:3a:3a:f0:f5:28
=
from ryu.controller import handler
from ryu.controller import dpset
from ryu.controller import ofp_event
from ryu.ofproto import ofproto_v1_3
from ryu.ofproto import ofproto_v1_3_parser
from ryu.base import app_manager
from ryu.ofproto.ofproto_parser import MsgBase, msg_pack_into, msg_str_attr
from ryu.topology import api
from ryu.topology import event
class OF13(app_manager.RyuApp):
OFP_VERSIONS = [ofproto_v1_3.OFP_VERSION]
_CONTEXTS = {
'dpset': dpset.DPSet,
}
def __init__(self, *args, **kwargs):
super(OF13, self).__init__(*args, **kwargs)
self.dpset = kwargs['dpset']
def _get_hwaddr(self, dpid, port_no):
return self.dpset.get_port(dpid, port_no).hw_addr
@handler.set_ev_cls(event.EventLinkAdd)
def link_add(self, ev):
print ev.link.src, ev.link.dst
print self._get_hwaddr(ev.link.src.dpid, ev.link.src.port_no)
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