For Ubuntu and Debian:

  To add this repository to your Debian/Ubuntu system, do:

# add GPG key
curl -s https://deb.frrouting.org/frr/keys.asc | sudo apt-key add -

# possible values for FRRVER: frr-6 frr-7 frr-8 frr-stable
# frr-stable will be the latest official stable release
FRRVER="frr-stable"
echo deb https://deb.frrouting.org/frr $(lsb_release -s -c) $FRRVER | sudo tee -a /etc/apt/sources.list.d/frr.list

# update and install FRR
sudo apt update && sudo apt install frr frr-pythontools

NOTE: To revert to FRR version 8.1 or 8.0, please replace frr with frr8.0 or frr8.1 in the sources url above. For example to revert to FRR 8.1, use: deb.frrouting.org/frr8.1

For RedHat and CentOS:

    To add this repository to your RedHat/CentOS system, do:

# possible values for FRRVER: frr-6 frr-7 frr-8 frr-stable
# frr-stable will be the latest official stable release
FRRVER="frr-stable"

# add RPM repository on CentOS 6
curl -O https://rpm.frrouting.org/repo/$FRRVER-repo-1-0.el6.noarch.rpm
sudo yum install ./$FRRVER*

# add RPM repository on CentOS 7
curl -O https://rpm.frrouting.org/repo/$FRRVER-repo-1-0.el7.noarch.rpm
sudo yum install ./$FRRVER*

# add RPM repository on CentOS 8
curl -O https://rpm.frrouting.org/repo/$FRRVER-repo-1-0.el8.noarch.rpm
sudo yum install ./$FRRVER*

# install FRR
sudo yum install frr frr-pythontools

More info: http://docs.frrouting.org/en/latest/installation.html

source: https://deb.frrouting.org/ https://rpm.frrouting.org/