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How to Squeeze a 1024-node OpenFlow Network onto your Laptop
(Extremely Experimental Development Version 0.1, December 2009)
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Mininet creates simple OpenFlow test networks by using process-based
virtualization and network namespaces.
Simulated hosts (as well as switches and controllers with the user
datapath) are created as processes in separate network namespaces. This
allows a complete OpenFlow network to be simulated on top of a single
Linux kernel.
In order to run Mininet, you must have:
* A Linux 2.6.26 or greater kernel compiled with network namespace support
* The OpenFlow reference implementation (either the user or kernel
datapath may be used, and the tun or ofdatapath kernel modules must be
loaded, respectively)
* Python, Bash, etc.
* Root privilieges (required for network device access)
* The netns program or equivalent (included as netns.c) installed
in an appropriate path location.
* mininet.py installed in an appropriate Python path location.
- A simple node infrastructure (Host, Switch, Controller classes) for
creating virtual OpenFlow networks.
- A simple network infrastructure (class Network and its descendants
TreeNet, GridNet and LinearNet) for creating scalable topologies and
running experiments (using someNetwork.run( test ) )
- Some simple tests which can be run using someNetwork.run( test )
- A simple command-line interface which may be invoked on a network using
.run( Cli )
- Examples (in examples/ directory) to help you get started.
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Notes and Advice:
For scalable configurations, you may need to increase some of your kernel
limits. For example, you could add something like the following to
/etc/sysctl.conf:
# OpenFlow: get rid of ipv6
net.ipv6.conf.all.disable_ipv6 = 1
net.ipv6.conf.default.disable_ipv6 = 1
# Mininet: Increase open file limit
fs.file-max = 100000
# Mininet: increase network buffer space
net.core.wmem_max = 16777216
net.core.rmem_max = 16777216
net.ipv4.tcp_rmem = 10240 87380 16777216
net.ipv4.tcp_rmem = 10240 87380 16777216
net.core.netdev_max_backlog = 5000
# Mininet: increase arp cache size
net.ipv4.neigh.default.gc_thresh1 = 4096
net.ipv4.neigh.default.gc_thresh2 = 8192
net.ipv4.neigh.default.gc_thresh3 = 16384
# Mininet .... and increase routing table size
net.ipv4.route.max_size=32768
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Bob Lantz
rlantz@cs.stanford.edu