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

.. include:: building-libyang.rst

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
    ./bootstrap.sh
    ./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 \
        --with-pkg-extra-version=-MyOwnFRRVersion
    make
    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
    net.ipv4.ip_forward=1

    # Uncomment the next line to enable packet forwarding for IPv6
    #  Enabling this option disables Stateless Address Autoconfiguration
    #  based on Router Advertisements for this host
    net.ipv6.conf.all.forwarding=1

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
    net.mpls.conf.eth0.input=1
    net.mpls.conf.eth1.input=1
    net.mpls.conf.eth2.input=1
    net.mpls.platform_labels=100000

Add MPLS kernel modules
^^^^^^^^^^^^^^^^^^^^^^^

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

::

    # Load MPLS Kernel Modules
    mpls-router
    mpls-iptunnel

**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.

::

    zebra=yes
    bgpd=yes
    ospfd=yes
    ospf6d=yes
    ripd=yes
    ripngd=yes
    isisd=yes

Enable the systemd service
^^^^^^^^^^^^^^^^^^^^^^^^^^

-  systemctl enable frr

Start the systemd service
^^^^^^^^^^^^^^^^^^^^^^^^^

-  systemctl start frr
-  use ``systemctl status frr`` to check its status.