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mininet_part1.md

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Mininet Basic Commands:

1. To check the mininet version

mn --version

2. To clean up the existing ovs bridges and namespaces

Note: sometime we mistakenly closed the mininet shell, or mininet crashed. But the topology components will continue to exists. To clean such stuff, cleanup command is used.

mn -c

3. Our First Topology (Single)

Topology with Single Switch and 4 Nodes.

Alt text

RYU SDN Controller

ryu-manager ryu.app.simple_switch_13

Mininet Topology

sudo mn --controller=remote,ip=127.0.0.1 --mac -i 10.1.1.0/24 --switch=ovsk,protocols=OpenFlow13 --topo=single,4
options Description
--controller type of controller local/remote and remote controller ip.
--mac mac address starts with 00:00:00:00:00:01
-i IP Subnets for the Topology
--switch Switch type (ovsk - openvswitch kernel module), and openflow version.
--topo topology type(linear,minimal,reversed,single,torus,tree) and params.

4. Mininet Basic Shell Commands

Informative commands

help
dump
net
links

Action commands

pingall
<node-name> <command> {args}
h1 ifconfig
h1 ping h2
h1 ip route

5. Linear Topology

linear topology (where each switch has one host, and all switches connect in a line)

Alt text

sudo mn --controller=remote,ip=127.0.0.1 --mac -i 10.1.1.0/24 --switch=ovsk,protocols=OpenFlow13 --topo=linear,4

6. Tree Topology

Alt text

sudo mn --controller=remote,ip=127.0.0.1 --mac -i 10.1.1.0/24 --topo=tree,depth=2,fanout=3

fanout : each switch is connected to these many childs depth : depth of the tree

References:

  1. http://mininet.org/walkthrough/

  2. https://en.wikipedia.org/wiki/Torus_interconnect