RouteReducer

Description

RouteReducer is a tool designed to optimize and summarize lists of IP subnets, supporting both IPv4 and IPv6 addresses. It takes a list of subnets, sorts them, and uses the aggregate6 command-line tool to efficiently combine contiguous and adjacent subnets into larger blocks where possible.

The tool produces a detailed report in both CSV and Excel formats, listing each summarized subnet along with its contributing original subnets and a status comment.

Structure

.
├── README.txt
├── ipv4
│   ├── routereducer_ipv4.py
│   └── subnets.txt
└── ipv6
    ├── routereducer_ipv6.py
    └── subnets.txt

Requirements

• Python 3.x
• pandas and xlsxwriter libraries
• aggregate6 command-line tool

Installation

• Prerequisites

1. Ensure Python 3 and pip are installed on your system.

Install Python Libraries

2. Install the required Python libraries with the following command:

pip install pandas xlsxwriter

Install aggregate6

3. aggregate6 can be installed differently depending on your operating system:

For general use or for systems not covered below:

pip3 install aggregate6

(ensure pip is for Python 3)

• OpenBSD:

doas pkg_add aggregate6

• CentOS/RHEL/Rocky:

yum install epel-release
yum install aggregate6

• Fedora:

dnf install aggregate6

For more detailed instructions, see the aggregate6 GitHub repository: https://github.com/job/aggregate6

Usage

1. Place your list of subnets in the subnets.txt file located in the appropriate directory (ipv4 or ipv6).
2. Run the corresponding Python script:

python routereducer_ipv4.py
# or
python routereducer_ipv6.py

Subnets Example

IPv4 Subnets Example:

172.16.2.0/24
10.0.0.0/25
172.16.0.0/24
192.168.0.0/24
10.0.0.128/25
192.168.1.0/24

IPv6 Subnets Example:

2001:db8::/32
2001:db8:1::/64
fd00:abcd:12::/64
fd00:abcd:13::/64
2607:f8b0:4005::/48
2607:f8b0:4007::/48

License

RouteReducer is released under the MIT License.

Acknowledgements

RouteReducer uses aggregate6 by Job Snijders, available at https://github.com/job/aggregate6.