An SR Controller BGP-LU with Segment Routing Labels
A Python Based SR and BGP Route Controller for Traffic Engineering.
To run the demo install EXABGP (version 4.0.0) along with Python 2.7.
This controller can be run on a VM or a BMS, but in addition is all dockerized and can be run in a container (instructions below)
For details on EXABGP refer to this link:
https://github.com/Exa-Networks/exabgp
INSTALLATION:
To build your own version of the controller all you need to do is install Docker clone the git repository:
git clone [email protected]:russellkelly/SR_Demo_Repo.git
IMPORTANT: ! Change the srdemo.conf file to match ingress (ingress LER) router's peering IP address. Note: The exabgp address, if runnning in a docker container) will not need to be changed as the docker container runs in private sr-net subnet and the controller (and hence the exabgp process) is given address 192.168.1.2.
Then in the cloned (SR_Demo_Repo) directory run:
make demo # This runs build: (Builds the image sr-demo) and spawns containers srbase & srdemo
The srbase container is one that exabgp runs in, and peers with ingress LER. One can connect to the container if required by running:
docker attach <container-id>|<container name>
to stop/start exabgp in this conatiner run: exabgp srdemo.conf (stop exabgp with CTRL+C)
The srdemo container starts as another container in sr-net to run the demo from.
The srdemo will delete upon exit. The srbase container will not. To stop and remove run:
make clean
All links in the ISIS configuration need to be configured as p2p - isis network point-to-point
Below is some details on what each file does:
Fires up a simple HTTP portal on port 5000 so one can post via the
EXABGP API.
Environmental file for exabgp. Copied into srbase
For building the demo containers.
This is the main script that is a multiprocess python program. One
process runs a Flask application to render the WebUI for interacting
with the controller. Another process continually gets the SID's from
the domain, and announces/removes routes upon any input from user via
Web UI, or automatically on any topology change. File itself is
extensively commented.
This is the html file that builds the webpage.
Holds the digrams for the original demo. Can replace these if required.
Note: best to amend the index.html file if you dont want these included
Monitor Interfaces Command for Arista Devices. Used in this demo to
visulize trafficbeing engineered troughout the domain.
This script continually monitors interfaces in one,
or more Arista devices.
I created this program to allow one or a number of switches to be monitored at
once, running on-box or off, and monitoring multiple specifically defined
interfaces or all of them, and the ability to define variables like packet count,
min packet rate to show etc.
See the help below:
Usage: monitor_interfaces.py [options]
Options:
-h, --help show this help message and exit
-b This option enables KBps to be dispalyed. Default is off.
--count_packet This option enables packet count to be dispalyed. Default
is off.
--safe This option enables configurations to be backed up before
running the program and restored upon exiting (Thus
keeping the load-interval commands as previous). Default
is off.
-u USERNAME Username. Mandatory option
-p PASSWORD Password. Mandatory option
-l LOAD_INTERVAL explicit interface load-interval rate. If set then every
interesting interface has its load-interval set, and
subsequently removed when packet-rate drops below 2pps.
Values 5-300. By default the programs sets the system
default load-interval to 5
-r PPSRATE min packet rate. Any interface with a rate above this
will report status. Default is 2 pps.
-a HOSTNAMES One or more hostnames (or IP addresses) of the switches to
poll. Comma separated. Mandatory option with multiple
arguments
-i INTERFACES optional argument with multiple arguments. Ethernet Ports
Only- Format: Ethernet<num>, or Eth<num>, comma separated,
or range separated with- e.g. Eth21-45 or
Eth1,Eth7,Eth21-45
As an example if I want to monitor devices lf275,fm213 but only
interfaces Eth2,4 and range 41-48, I want to show packet count and and KBps count
I would run the follwoing:
python monitor_interfaces.py -u admin -p admin -r 10 -a lf275,fm213 --count_packet -b -i Eth1,Eth2, Eth41-48
For no KBps count and all interfaces over the rate of 10pps:
python monitor_interfaces.py -u admin -p admin -r 10 -a lf275,fm213,fm382 --count_packet
Once the git repository has been cloned locally the files srdemo and sr_demo.py need to be amended with the specific Topology and Runtime information for your topology
Change the following in sr_demo.py: BGP_LU_Peer = 'xxx.xxx.xxx.xxx' (your ingress LER IP) Change the following in srdemo.conf: neighbor
One of the ISIS SR enabled routers that is in your domain will need to have eAPI enabled (see documentation). This router will be used for topology (ISIS DB) export.
Now one can run controller:
make demo
python sr_demo.py -u <eAPI username> -p <eAPI password> -a <ISIS DB Topology Export Router IP>
Now browse to the IP address of the VM or local machine where docker is installed, on port 5003
http://"localhost" or "VM IP":5003
Build an Ubuntu BMS, or VM and add all requirements per the Dockerfile (detailed below - one can use the Makefile):
Base ubuntu 14.04 Install
apt-get update
apt-get install -qy --no-install-recommends wget python git
apt-get install -qy openssh-server
apt-get install -qy openssh-client
apt-get install -qy python-pip
apt-get install -qy python-dev
apt-get install -qy libxml2-dev
apt-get install -qy libxslt-dev
apt-get install -qy libssl-dev
apt-get install -qy libffi-dev
apt-get install -qy sudo
apt-get install -qy vim
apt-get install -qy telnet
apt-get clean
pip install flask
pip install pyeapi
pip install jsonrpc
pip install jsonrpclib
mkdir /home/demos/sr-demo
git clone https://github.com/Exa-Networks/exabgp.git
/home/demos/sr-demo/exabgp
git checkout master
chmod +x setup.py
sudo ./setup.py install
cd /home/demos/sr-demo
cp exabgp.env /usr/local/etc/exabgp/exabgp.env
useradd -m demo && echo "demo:demo" | chpasswd && adduser demo sudo
Once the git repository has been cloned locally follow the same instructions above to configure the files and run the demo; except the IP address of the controller (the VM EXABGP is installed on) will need to be specified in srdemo.conf and sr_demo.py in addition to the ingress LER IP.