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Building FRR on FreeBSD 9 from Git Source
=========================================

FreeBSD 9 restrictions:
-----------------------

- MPLS is not supported on `FreeBSD`. MPLS requires a Linux Kernel
  (4.5 or higher). LDP can be built, but may have limited use 
  without MPLS
  
Install required packages
-------------------------

Add packages:
(Allow the install of the package managment tool if this is first package 
install and asked)  

    pkg install -y git autoconf automake libtool gmake gawk \
        pkgconf texinfo json-c bison flex py27-pytest

Make sure there is no /usr/bin/flex preinstalled (and use the newly
installed in /usr/local/bin):
(FreeBSD frequently provides a older flex as part of the base OS which
takes preference in path)

    rm -f /usr/bin/flex

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 group and user

    pw groupadd frr -g 101
    pw groupadd frrvty -g 102
    pw adduser frr -g 101 -u 101 -G 102 -c "FRR suite" \
        -d /usr/local/etc/frr -s /usr/sbin/nologin

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

    git clone https://github.com/freerangerouting/frr.git frr
    cd frr
    git checkout stable/2.0
    ./bootstrap.sh
    export MAKE=gmake
    export LDFLAGS="-L/usr/local/lib"
    export CPPFLAGS="-I/usr/local/include"
    ./configure \
        --sysconfdir=/usr/local/etc/frr \
        --enable-pkgsrcrcdir=/usr/pkg/share/examples/rc.d \
        --localstatedir=/var/run/frr \
        --prefix=/usr/local \
        --enable-ospfclient=yes \
        --enable-ospfapi=yes \
        --enable-multipath=64 \
        --enable-user=frr \
        --enable-group=frr \
        --enable-vty-group=frrvty \
        --enable-configfile-mask=0640 \
        --enable-logfile-mask=0640 \
        --enable-rtadv \
        --enable-tcp-zebra \
        --enable-fpm \
        --with-pkg-git-version \
        --with-pkg-extra-version=-MyOwnFRRVersion   
    gmake
    gmake check
    sudo gmake install

### Create empty FRR configuration files
    sudo mkdir /usr/local/etc/frr
    sudo touch /usr/local/etc/frr/zebra.conf
    sudo touch /usr/local/etc/frr/bgpd.conf
    sudo touch /usr/local/etc/frr/ospfd.conf
    sudo touch /usr/local/etc/frr/ospf6d.conf
    sudo touch /usr/local/etc/frr/isisd.conf
    sudo touch /usr/local/etc/frr/ripd.conf
    sudo touch /usr/local/etc/frr/ripngd.conf
    sudo touch /usr/local/etc/frr/pimd.conf
    sudo chown -R frr:frr /usr/local/etc/frr
    sudo touch /usr/local/etc/frr/vtysh.conf
    sudo chown frr:frrvty /usr/local/etc/frr/vtysh.conf
    sudo chmod 640 /usr/local/etc/frr/*.conf

### Enable IP & IPv6 forwarding

Add the following lines to the end of `/etc/sysctl.conf`:

    # Routing: We need to forward packets
    net.inet.ip.forwarding=1
    net.inet6.ip6.forwarding=1

**Reboot** or use `sysctl` to apply the same config to the running system