arista_Check

Software to check EOS topology and validate physical deployment in large environment.

Supported features

• Interface status
• LLDP topology
• BGP Status
• BGP status for EVPN
• MLAG Status check
• PDF export.

Requirements

• Python 3
• Flask
• wkhtmltopdf
• DNS resolution for EOS devices.
• eAPI running on port 80

Installation

Step 1 : Install Python requirements

$ pip install -r requirements.txt

Step2 : Install wkhtmltopdf to generate PDF files

On Macos, use brew:

$ brew install Caskroom/cask/wkhtmltopdf

On headless centos, use following setup:

# Install base tool
$ yum install -y wkhtmltopdf

# Required for headless use
$ yum install xorg-x11-server-Xvfb
$ yum install xorg-x11-fonts-Type1 xorg-x11-fonts-75dpi

# Create Service file
$ vim xvfb.service
[Unit]
Description=Virtual Frame Buffer X Server
After=network.target

[Service]
ExecStart=/usr/bin/Xvfb :42 -screen 0 1024x768x24 -ac +extension GLX +render -noreset

[Install]
WantedBy=multi-user.target

# Deploy service
$ cp xvfb.service /etc/systemd/system/xvfb.service
$ sudo systemctl enable xvfb.service && sudo systemctl start xvfb.service && sudo systemctl status xvfb.service
$ sudo systemctl daemon-reload

# Create binary
$ printf '#!/bin/bash\nxvfb-run -a --server-args="-screen 0, 1024x768x24" /usr/bin/wkhtmltopdf -q $*' > /usr/bin/wkhtmltopdf.sh
$ chmod a+x /usr/bin/wkhtmltopdf.sh
$ ln -s /usr/bin/wkhtmltopdf.sh /usr/local/bin/wkhtmltopdf

# Run a test
$ wkhtmltopdf http://www.google.com output.pdf

Server Configuration

Server uses DNS hostname to reach devices and connect using eAPI on HTTP port (not HTTPS)

Generate topology file

Edit the file referenceCablingMap.json The network representation is based on level (from 1 to nn)

In general:

• level1 is for the Spine.
• level2 is for the Leaf.
• level3 is for the distribution Leaf.

Reference cable example file:

{
  "level1": {                 // Spine level
    "spine1": {               // Spine hostname
      "1": ["leaf1-A","1"],   // Spine1_Eth1 connected to leaf1-A Ethernet1
      "2": ["leaf1-B","1"]
    },
    "spine2": {
      "1": ["leaf1-A","2"],
      "2": ["leaf1-B","2"]
    }
  },
  "level2": {
    "leaf1-A": {
      "3": ["leaf1-B","3"],
      "5": ["leaf3-A","1"]
    },
    "leaf1-B":{
      "5": ["leaf3-A","2"],
      "6":["leaf-level2","2"]
    },
    "leaf2-A": {
      "3": ["leaf2-B","3"],
      "4":["leaf4-A","1"]
    },
    "leaf2-B":{
      "4":["leaf4-A","2"]
    }
  },
  "level3":{
    "leaf3-A":{
      "18":["leaf5-A","1"]
    }
  }
}

Configure Username and password

Edit file dwarfFunction.py and change value for username and password:

username = 'dwarf'
password = 'arista'

Change DC hostname (optional)

Edit config.py accordingly:

AUTHOR = "EOS User"
SITE = "DC1 Fabric"

Run service

when executed, server is configured to listen on all interfaces on port 80. It means, you need to get root permission to open socket on that particular port

[root@centos7-lab arista_Check]# python3 run.py
 * Serving Flask app "visuapp.views" (lazy loading)
 * Environment: production
   WARNING: This is a development server. Do not use it in a production deployment.
   Use a production WSGI server instead.
 * Debug mode: off
 * Running on http://0.0.0.0:80/ (Press CTRL+C to quit)
10.73.1.240 - - [06/Jun/2020 12:05:47] "GET /static/css/bootstrap/bootstrap.min.css HTTP/1.1" 200 -
10.73.1.240 - - [06/Jun/2020 12:05:47] "GET /static/css/pdf.css HTTP/1.1" 200 -
10.73.1.28 - - [06/Jun/2020 12:05:48] "GET /mapCablingPdf HTTP/1.1" 200 -
10.73.1.28 - - [06/Jun/2020 12:06:01] "GET / HTTP/1.1" 200 -

License

Project is published under Apache License.