Ubuntu 18.04 LTS

This document describes installation from source. If you want to build a deb, see Packaging Debian.

Installing Dependencies

sudo apt update
sudo apt-get install \
   git autoconf automake libtool make libreadline-dev texinfo \
   pkg-config libpam0g-dev libjson-c-dev bison flex python3-pytest \
   libc-ares-dev python3-dev libsystemd-dev python-ipaddress python3-sphinx \
   install-info build-essential libsystemd-dev libsnmp-dev perl libcap-dev

FRR depends on the relatively new libyang library to provide YANG/NETCONF support. Unfortunately, most distributions do not yet offer a libyang package from their repositories. Therefore we offer two options to install this library.

Option 1: Binary Install

The FRR project builds some binary libyang packages.

RPM packages are at our RPM repository.

DEB packages are available as CI artifacts here.


libyang version 1.0.184 or newer is required to build FRR.


The libyang development packages need to be installed in addition to the libyang core package in order to build FRR successfully. Make sure to download and install those from the link above alongside the binary packages.

Depending on your platform, you may also need to install the PCRE development package. Typically this is libpcre-dev or pcre-devel.


For Debian-based systems, the official libyang package requires recent versions of swig (3.0.12) and debhelper (11) which are only available in Debian buster (10). However, libyang packages built on Debian buster can be installed on both Debian jessie (8) and Debian stretch (9), as well as various Ubuntu systems. The python3-yang package will not work, but the other packages (libyang-dev is the one needed for FRR) will.

Option 2: Source Install


Ensure that the libyang build requirements are met before continuing. Usually this entails installing cmake and libpcre-dev or pcre-devel.

git clone https://github.com/CESNET/libyang.git
cd libyang
mkdir build; cd build
      -D CMAKE_BUILD_TYPE:String="Release" ..
sudo make install


sudo apt-get install protobuf-c-compiler libprotobuf-c-dev


sudo apt-get install libzmq5 libzmq3-dev

Building & Installing FRR

Add FRR user and groups

sudo groupadd -r -g 92 frr
sudo groupadd -r -g 85 frrvty
sudo adduser --system --ingroup frr --home /var/run/frr/ \
   --gecos "FRR suite" --shell /sbin/nologin frr
sudo usermod -a -G frrvty frr


Clone the FRR git repo and use the included configure script to configure FRR’s build time options to your liking. The full option listing can be obtained by running ./configure -h. The options shown below are examples.


If your platform uses systemd, please make sure to add --enable-systemd=yes to your configure options.

git clone https://github.com/frrouting/frr.git frr
cd frr
./configure \
    --prefix=/usr \
    --includedir=\${prefix}/include \
    --enable-exampledir=\${prefix}/share/doc/frr/examples \
    --bindir=\${prefix}/bin \
    --sbindir=\${prefix}/lib/frr \
    --libdir=\${prefix}/lib/frr \
    --libexecdir=\${prefix}/lib/frr \
    --localstatedir=/var/run/frr \
    --sysconfdir=/etc/frr \
    --with-moduledir=\${prefix}/lib/frr/modules \
    --with-libyang-pluginsdir=\${prefix}/lib/frr/libyang_plugins \
    --enable-configfile-mask=0640 \
    --enable-logfile-mask=0640 \
    --enable-snmp=agentx \
    --enable-multipath=64 \
    --enable-user=frr \
    --enable-group=frr \
    --enable-vty-group=frrvty \
    --with-pkg-git-version \
sudo make install

Install FRR configuration files

sudo install -m 775 -o frr -g frr -d /var/log/frr
sudo install -m 775 -o frr -g frrvty -d /etc/frr
sudo install -m 640 -o frr -g frrvty tools/etc/frr/vtysh.conf /etc/frr/vtysh.conf
sudo install -m 640 -o frr -g frr tools/etc/frr/frr.conf /etc/frr/frr.conf
sudo install -m 640 -o frr -g frr tools/etc/frr/daemons.conf /etc/frr/daemons.conf
sudo install -m 640 -o frr -g frr tools/etc/frr/daemons /etc/frr/daemons

Tweak sysctls

Some sysctls need to be changed in order to enable IPv4/IPv6 forwarding and MPLS (if supported by your platform). If your platform does not support MPLS, skip the MPLS related configuration in this section.

Edit /etc/sysctl.conf and uncomment the following values (ignore the other settings):

# Uncomment the next line to enable packet forwarding for IPv4

# Uncomment the next line to enable packet forwarding for IPv6
#  Enabling this option disables Stateless Address Autoconfiguration
#  based on Router Advertisements for this host

Reboot or use sysctl -p to apply the same config to the running system.

Add MPLS kernel modules

Ubuntu 18.04 ships with kernel 4.15. MPLS modules are present by default. To enable, add the following lines to /etc/modules-load.d/modules.conf:

# Load MPLS Kernel Modules

And load the kernel modules on the running system:

sudo modprobe mpls-router mpls-iptunnel

If the above command returns an error, you may need to install the appropriate or latest linux-modules-extra-<kernel-version>-generic package. For example apt-get install linux-modules-extra-`uname -r`-generic

Enable MPLS Forwarding

Edit /etc/sysctl.conf and the following lines. Make sure to add a line equal to net.mpls.conf.eth0.input for each interface used with MPLS.

# Enable MPLS Label processing on all interfaces

Install service files

sudo install -m 644 tools/frr.service /etc/systemd/system/frr.service
sudo systemctl enable frr

Enable daemons

Open /etc/frr/daemons with your text editor of choice. Look for the section with watchfrr_enable=... and zebra=... etc. Enable the daemons as required by changing the value to yes.

Start FRR

systemctl start frr