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Experiment 2

👉 Task 1 - Ryu Topology Viewer

In Terminal

# start the ryu-manager
# Gui topology with controller
$ cd ~
$ ryu-manager --verbose ryu/ryu/app/gui_topology/gui_topology.py ryu/ryu/app/simple_switch_13.py
# start the mininet
$ sudo mn --mac --switch ovs,protocols=OpenFlow13 --controller remote

📌 Open http://127.0.0.1:8080 in browser, then you can see the Topology

Topo_style Description Sample

minimal (default)

Minimal topology with two hosts and one switch

 sudo mn

linear

Linear topology of k switches, with one host per switch.

 sudo mn --topo linear,k

reversed

Single switch connected to k hosts, with reversed ports.

 sudo mn --topo reversed,k

single

Single switch connected to k hosts.

 sudo mn --topo single,k

tree

Topology for a tree network with a given depth and fanout.

 sudo mn --topo tree,n,k

torus

2-D Torus topology

 sudo mn --topo torus,n,k

👉 Task 2 - With Custom Topology

◽ task2_topo.py

from mininet.topo import Topo
from mininet.link import TCLink
class MyTopo(Topo):

    def __init__(self):
        Topo.__init__(self)

        h1 = self.addHost("h1")
        h2 = self.addHost("h2")
        h3 = self.addHost("h3")
        h4 = self.addHost("h4")
        s1 = self.addSwitch("s1")
        s2 = self.addSwitch("s2")

        self.addLink(h1,s1)
        self.addLink(h2,s1)
        self.addLink(h3,s1)
        self.addLink(s1,s2)
        self.addLink(h4,s2)

topos = {"mytopo":(lambda : MyTopo())}

In Terminal

# start the ryu-manager
# with controller (simple_switch_13.py)
$ cd ~
$ ryu-manager --verbose ryu/ryu/app/gui_topology/gui_topology.py ryu/ryu/app/simple_switch_13.py
# start the mininet
$ cd ~
$ sudo mn --custom network_slice/experiment_2/task2_topo.py --topo mytopo --mac --switch ovs,protocols=OpenFlow13 --controller remote

📌 Open http://127.0.0.1:8080 🔗 in browser, then you can see the Topology

👉 Task 3-1 - Modify Flows

In Terminal

# start the ryu-manager
$ ryu-manager --verbose ryu/ryu/app/simple_switch_13.py
# mininet
$ sudo mn --topo single,4 --mac --switch ovs,protocols=OpenFlow13 --controller remote

In Terminal

Modify the flowentrys that make h1 and h4 can't ping each other

# show the s1 flowentry
$ sudo ovs-ofctl -O OpenFlow13 dump-flows s1

$ sudo ovs-ofctl -O OpenFlow13 mod-flows s1 "table=0, priority=1, in_port="s1-eth4", dl_src=00:00:00:00:00:04, dl_dst=00:00:00:00:00:01, actions=drop"
# mod the flow meets the match to set action=drop

$ sudo ovs-ofctl -O OpenFlow13 mod-flows s1 "table=0, priority=1, in_port="s1-eth1", dl_src=00:00:00:00:00:01, dl_dst=00:00:00:00:00:04, actions=drop"
# mod the flow meets the match to set action=drop

Then pingall in mininet, it will show

h1 -> h2 h3 x h2 -> h1 h3 h4 h3 -> h1 h2 h4 h4 -> x h2 h3

👉 Task 3-2 - Add Flows by command with restrict

◽ task3_topo.py

from mininet.topo import Topo
from mininet.link import TCLink
class MyTopo(Topo):

    def __init__(self):
        Topo.__init__(self)

        h1 = self.addHost("h1")
        h2 = self.addHost("h2")
        h3 = self.addHost("h3")
        h4 = self.addHost("h4")
        s1 = self.addSwitch("s1")
        s2 = self.addSwitch("s2")
        s3 = self.addSwitch("s3")
        s4 = self.addSwitch("s4")

        self.addLink(s1,h1)
        self.addLink(s1,s2)
        self.addLink(s2,s4)
        self.addLink(s4,h3)

        self.addLink(s1,h2)
        self.addLink(s1,s3)
        self.addLink(s4,s3)
        self.addLink(s4,h4)
        
topos = {"mytopo":(lambda : MyTopo())}

In Terminal

# start the ryu-manager
$ ryu-manager --verbose ryu/ryu/app/ofctl_rest.py
# start the mininet
$ sudo mn --custom network_slice/experiment_2/task3_topo.py --topo mytopo --mac --switch ovs,protocols=OpenFlow13 --controller remote

Then pingall in mininet, it will show

h1 -> x h3 x h2 -> x x h4 h3 -> h1 x x h4 -> x h2 x

🔑 Add the all flowentrys for s1, s2, s3, s4

$ sudo ovs-ofctl -O OpenFlow13 add-flow s1 in_port=1,actions=output:2
$ sudo ovs-ofctl -O OpenFlow13 add-flow s1 in_port=2,actions=output:1
$ sudo ovs-ofctl -O OpenFlow13 add-flow s1 in_port=3,actions=output:4
$ sudo ovs-ofctl -O OpenFlow13 add-flow s1 in_port=4,actions=output:3
$ sudo ovs-ofctl -O OpenFlow13 add-flow s2 in_port=1,actions=output:2
$ sudo ovs-ofctl -O OpenFlow13 add-flow s2 in_port=2,actions=output:1
$ sudo ovs-ofctl -O OpenFlow13 add-flow s3 in_port=1,actions=output:2
$ sudo ovs-ofctl -O OpenFlow13 add-flow s3 in_port=2,actions=output:1
$ sudo ovs-ofctl -O OpenFlow13 add-flow s4 in_port=1,actions=output:2
$ sudo ovs-ofctl -O OpenFlow13 add-flow s4 in_port=2,actions=output:1
$ sudo ovs-ofctl -O OpenFlow13 add-flow s4 in_port=3,actions=output:4
$ sudo ovs-ofctl -O OpenFlow13 add-flow s4 in_port=4,actions=output:3

👉 Task 4-1 - Meter Table

📌 🔗 Notice the OVS version and Linux kernel version when using meter

In Terminal

# start the ryu-manager
$ ryu-manager --verbose ryu/ryu/app/simple_switch_13.py
# start the mininet
$ sudo mn --custom network_slice/experiment_2/task2_topo.py --topo mytopo --mac --switch ovs,protocols=OpenFlow13 --controller remote

📌 🔗 To use ovs-vswitchd in Userspace mode, set a switch with datapath_type=netdev in the configuration database (default datapath_type=system) 

$ sudo ovs-vsctl set bridge s1 datapath_type=netdev 
$ sudo ovs-vsctl set bridge s2 datapath_type=netdev

In Mininet

# open Xterm for h1 h2 h3 h4 in mininet 
$ xterm h1 h2 h3 h4

In Xterm h4

📌 When datapath_type is set to netdev, the datapath is converted from Kernel mode to Userspace mode, datapath receives the packet arrives, the packet will be checked and the packet will be discarded if the check fails. This is why in many cases, after datapath_type=netdev, the hosts can be ping through, but the iperf cannot be used to measure bandwidth. Need to turn off tx-checksumming.

# turn off the tx-checksumming
$ ethtool -K h4-eth0 tx off
$ iperf -s

In Xterm h1

# turn off the tx-checksumming
$ ethtool -K h1-eth0 tx off
$ iperf -c 10.0.0.4

In Xterm h2

# turn off the tx-checksumming
$ ethtool -K h2-eth0 tx off
$ iperf -c 10.0.0.4

In Xterm h3

# turn off the tx-checksumming
$ ethtool -K h3-eth0 tx off
$ iperf -c 10.0.0.4

In Terminal

# add meter
$ sudo ovs-ofctl -O OpenFlow13 add-meter s1 meter=1,kbps,band=type=drop,rate=5000
# 5000 kbps = 5 Mbps

# show meters
$ sudo ovs-ofctl -O OpenFlow13 dump-meters s1

# show flowentrys in terminal
$ sudo ovs-ofctl -O OpenFlow13 dump-flows s1

# modify the flowentry meet the match, set action into meter then outport 
$ sudo ovs-ofctl -O OpenFlow13 mod-flows s1 "table=0, priority=1, in_port="s1-eth1", dl_src=00:00:00:00:00:01, dl_dst=00:00:00:00:00:04, actions=meter:1,output:"s1-eth4""

In Xterm h1

# check the different 
$ iperf -c 10.0.0.4

Optional, In Terminal

# delete meter 
$ sudo ovs-ofctl -O OpenFlow13 del-meter s1 meter=1

🔗Relate page

👉 Task 4-2 - Flowentry Design

◽ task4_topo.py

from mininet.topo import Topo
from mininet.link import TCLink
class MyTopo(Topo):

    def __init__(self):
        Topo.__init__(self)

        h1 = self.addHost("h1")
        h2 = self.addHost("h2")
        h3 = self.addHost("h3")

        s1 = self.addSwitch("s1")
        s2 = self.addSwitch("s2")
        s3 = self.addSwitch("s3")

        self.addLink(h1,s1,cls=TCLink,bw=100) # bw=Mbps
        self.addLink(h2,s2,cls=TCLink,bw=100)
        self.addLink(h3,s3,cls=TCLink,bw=100)
        self.addLink(s1,s2,cls=TCLink,bw=10)
        self.addLink(s1,s3,cls=TCLink,bw=100)
        self.addLink(s2,s3,cls=TCLink,bw=100)
        
topos = {"mytopo":(lambda : MyTopo())}

🔗 Mininet config function source code

In Terminal

# start the ryu-manager
$ ryu-manager --verbose ryu/ryu/app/ofctl_rest.py
# start the mininet
$ sudo mn --custom network_slice/experiment_2/task4_topo.py --topo mytopo --mac --switch ovs,protocols=OpenFlow13 --controller remote

🔑 Add flowentrys to s1, s2, s3

$ sudo ovs-ofctl -O OpenFlow13 add-flow s1 table=0,in_port=1,actions=output:3
# in s1, from port1(h1) to port3(s3)

$ sudo ovs-ofctl -O OpenFlow13 add-flow s1 table=0,in_port=3,actions=output:1
# in s1, from port3(s2)  to port1(h1)

$ sudo ovs-ofctl -O OpenFlow13 add-flow s2 table=0,in_port=1,actions=output:3
# in s2, from port1(h2)  to port3(s3)

$ sudo ovs-ofctl -O OpenFlow13 add-flow s2 table=0,in_port=3,actions=output:1
# in s2, from port3(s3)  to port1(h2)

$ sudo ovs-ofctl -O OpenFlow13 add-flow s3 table=0,in_port=3,actions=output:2
# in s3, from port3(s2)  to port2(s1)

$ sudo ovs-ofctl -O OpenFlow13 add-flow s3 table=0,in_port=2,actions=output:3
# in s3, from port2(s1)  to port3(s2)

In Mininet

# open Xterm for h1 h2 in mininet 
$ xterm h1 h2

Xterm h1

# open iperf
$ iperf -s

Xterm h2

# open iperf
$ iperf -c 10.0.0.1 -i 2

📌 Transmission Bandwidth between h1 and h2 does not restrict in 10Mbps.