As a network engineer, we already familiar with a Layer-2 technology that separate a broadcast domain into logical group of network which is normally we call it as VLAN (Virtual LAN). Due to some limitations of VLAN features to facilitate new requirements in the Data Center environment hence VXLAN has been introduced recently.
VXLAN (Virtual Extensible LAN) provides Layer-2 technology connectivity between multiple sites over Layer-3 (IP) network. VXLAN some benefits, such as:
- Support more virtual L2 domain than normal VLAN. VXLAN can support up to 224 (16 millions) virtual IDs while normal VLAN can support up to 212 (4096) only.
- Easy deployment and maintenance. We just need to deploy VXLAN on the edge devices while the transport devices typically run Layer-3 forwarding.
To illustrate how the VXLAN network is looked like, please refer this picture below:
The Layer-2 frames are encapsulated and forwarded over Layer-3 network across the sites. Basically, it sounds similar like the other technology (i.e.: VPLS or Cisco OTV).
Continue reading VXLAN Unicast-Mode on HPE Router
Software Defined Network (SDN) is not something new anymore at this moment. All networking vendors are competing to promote their own controller. However, there are also a lot of open source controller outside there, i.e.: ODL, POX/NOX, Floodlight, and Ryu which are the most popular in the market now.
Ryu (ree-yooh) is one of
my favourite open source SDN controller based on Python. Even though I had some experiences with Java programming but I think Python is easier to study, flexible, and quite useful for Network Engineer. In this session, I want to share my experience how to install Ryu Controller on Ubuntu Server 16.04. Please update and upgrade your Ubuntu OS before do these steps:
# Install RYU
echo "Step 1. Install tools"
sudo apt-get -y install git python-pip python-dev
echo "Step 2. Install python packages"
sudo apt-get -y install python-eventlet python-routes python-webob python-paramiko
echo "Step 3. Clone RYU git Repo"
git clone --depth=1 https://github.com/osrg/ryu.git
echo "Step 4. Install RYU"
sudo pip install setuptools --upgrade
sudo python ./setup.py install
echo "Step 5. Install and Update python packages"
sudo pip install six --upgrade
sudo pip install oslo.config msgpack-python
sudo pip install eventlet --upgrade
echo "Step 6. Test ryu-manager"
You can save those scripts as ryu-install.sh file and execute it under Linux terminal. If you get an error (some distribution is not found) after the installation, then type these commands to fix it:
$ sudo pip install -r tools/pip-requires
$ sudo python setup.py install
Finally, this is a brief note about how to install Ryu Controller under Ubuntu 16.04 server. Happy testing and welcome to SDN world!
GNS3 is an open source application for network simulation. I use it since I was studying CCNA, CCNP, and CCIE till now. I can emulate real Cisco IOS in this application. Due to its previous limitation on Switching emulation, now they release an update feature to run Cisco IOU (IOS On Unix) in the new version of GNS3. You can simulate Cisco IOU for L2/L3 device in GNS3. This is what I need to pursue my CCIE certification!
In this session, I want to share a tutorial how to configure GNS IOU VM on 1.5.4 version (the latest version is 2.0.x, but I’m still prefer to use 1.5.4 version due to its stability and compatibility with my notebook). I believe there are people outside there who already familiar and shared this kind of tutorial but I wanna do in my way ~ at least, it’s for personal reference ~.
OK, these are some items we need to prepare before installation.
Continue reading GNS3 IOU VM 1.5.4 Installation