I am currently working on developing some code to work with the topology of
a Ryu network. I am trying (if possible) to avoid using the REST API, and
have the whole thing self-contained.
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?
For example:
host1 attaches to switch1 port1
host2 attaches to switch2 port1
switch1 linked to switch2 on port 2 of each.
Since I am only getting the MAC of the interface, and not what is attached
to it, I am having some trouble finding the links between switches. This is
all new to me, so any help or suggestions would be appreciated.
Below is a sample of the code I was playing with. Some of it may seem
verbose, but it was used for debugging (better methods could be used once I
have things figured out).
# this is called if there are no mac_to_ports entries
def switchHookups(self):
switches = self.dpset.get_all()
pa = []
SwitchHookup = namedtuple('SwitchHookup','dpid,mac,port')
for switch in switches:
for p in self.dpset.get_ports(switch[0]):
sh =
SwitchHookup(dpid=switch[0],mac=p.hw_addr,port=p.port_no)
self.switch_hookups.append(sh)
# learn a mac address to avoid FLOOD next time.
self.mac_to_port.setdefault(sh.dpid,{})
self.mac_to_port[sh.dpid][sh.mac] = sh.port
# this is called when an ARP request comes in, this was how I was able
to
# map things backwards using the in_port, mapping it to the dpset HW
address
# and then following the links. This is also where I am unable to
identify the links
# made between switches
def do_arp(self, ar, in_port, dpid):
self.mac_to_ip.setdefault(ar.src_mac,{})
self.mac_to_ip[ar.src_mac] = ar.src_ip
self.ip_to_port.setdefault(ar.src_ip, {})
self.ip_to_port[ar.src_ip]["port_no"] = in_port
My goal is to have a function that would return the following: { "dpid":
"id", "links": [ {"port_no","mac_addr_host","ip_host"} ] }. That would at
least be a start. Thanks in advance for your assistance (and better
solution(s)).
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