How do I run Python topology in Mininet

Mininet supports a simple python API to create custom network topologies .The Mininet python API consist of number of python classes, such as Topo, Mininet, host, switch, link and their subclasses. The step involved in run python topology in Mininet is provided in this article.

Create topology using python

Initially to create a topology, first create a proposed algorithm and protocals based on python script in the simulation source configuration file and save the file with file extension .py ,

Source code for OSPF protocol,

OSPF_HELLO     = “> L HBB L L L”

OSPF_HELLO_LEN = struct.calcsize (OSPF_HELLO)

OSPF_DESC     = “> HBB L “

OSPF_DESC_LEN = struct.calcsize(OSPF_DESC)

OSPF_LSREQ     = “> L L L”

OSPF_LSREQ_LEN = struct.calcsize (OSPF_LSREQ)

Source code for call the protocol code in configuration file,

from ospf import OspfExc

import ospf_listener as ospfobj

    U.initialize()

    ospfobj.intrusion(ospfobj)

    CLI (net)  

    ospfobj.send_message (ospfobj)

This below picture represents saved simulation source configuration files with file extension .py ,