Ubuntu 16.04LTS

  • MPLS is not supported on Ubuntu 16.04 with default kernel. MPLS requires Linux Kernel 4.5 or higher (LDP can be built, but may have limited use without MPLS) For an updated Ubuntu Kernel, see http://kernel.ubuntu.com/~kernel-ppa/mainline/

Install required packages

Add packages:

apt-get install \
   git autoconf automake libtool make gawk libreadline-dev texinfo dejagnu \
   pkg-config libpam0g-dev libjson-c-dev bison flex python-pytest \
   libc-ares-dev python3-dev libsystemd-dev python-ipaddress \
   python3-sphinx install-info build-essential libsystemd-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 binary libyang packages, which we offer for download here.


libyang version 0.16.74 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
sudo make install

When building libyang on CentOS 6, it’s also necessary to pass the -DENABLE_CACHE=OFF parameter to cmake.

Get FRR, compile it and install it (from Git)

This assumes you want to build and install FRR from source and not using any packages

Add frr groups and user

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

Download Source, configure and compile it

(You may prefer different options on configure statement. These are just an example.)

git clone https://github.com/frrouting/frr.git frr
cd frr
./configure \
    --prefix=/usr \
    --enable-exampledir=/usr/share/doc/frr/examples/ \
    --localstatedir=/var/run/frr \
    --sbindir=/usr/lib/frr \
    --sysconfdir=/etc/frr \
    --enable-multipath=64 \
    --enable-user=frr \
    --enable-group=frr \
    --enable-vty-group=frrvty \
    --enable-configfile-mask=0640 \
    --enable-logfile-mask=0640 \
    --enable-fpm \
    --enable-systemd=yes \
    --with-pkg-git-version \
make check
sudo make install

Create empty FRR configuration files

sudo install -m 755 -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 frr /dev/null /etc/frr/zebra.conf
sudo install -m 640 -o frr -g frr /dev/null /etc/frr/bgpd.conf
sudo install -m 640 -o frr -g frr /dev/null /etc/frr/ospfd.conf
sudo install -m 640 -o frr -g frr /dev/null /etc/frr/ospf6d.conf
sudo install -m 640 -o frr -g frr /dev/null /etc/frr/isisd.conf
sudo install -m 640 -o frr -g frr /dev/null /etc/frr/ripd.conf
sudo install -m 640 -o frr -g frr /dev/null /etc/frr/ripngd.conf
sudo install -m 640 -o frr -g frr /dev/null /etc/frr/pimd.conf
sudo install -m 640 -o frr -g frr /dev/null /etc/frr/ldpd.conf
sudo install -m 640 -o frr -g frr /dev/null /etc/frr/nhrpd.conf
sudo install -m 640 -o frr -g frrvty /dev/null /etc/frr/vtysh.conf

Enable IPv4 & IPv6 forwarding

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

Enable MPLS Forwarding (with Linux Kernel >= 4.5)

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

# Enable MPLS Label processing on all interfaces

Add MPLS kernel modules

Add the following lines to /etc/modules-load.d/modules.conf:

# Load MPLS Kernel Modules

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

Install the systemd service (if rebooted from last step, change directory back to frr directory)

sudo install -m 644 tools/frr.service /etc/systemd/system/frr.service
sudo install -m 644 tools/etc/frr/daemons /etc/frr/daemons
sudo install -m 644 tools/etc/frr/frr.conf /etc/frr/frr.conf
sudo install -m 644 -o frr -g frr tools/etc/frr/vtysh.conf /etc/frr/vtysh.conf

Enable daemons

Edit /etc/frr/daemons and change the value from “no” to “yes” for those daemons you want to start by systemd.
For example.

Enable the systemd service

  • systemctl enable frr

Start the systemd service

  • systemctl start frr
  • use systemctl status frr to check its status.