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building-frr-for-debian12.rst

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Debian 12

Install required packages

Add packages:

sudo apt-get install git autoconf automake libtool make \
   libprotobuf-c-dev protobuf-c-compiler build-essential \
   python3-dev python3-pytest python3-sphinx libjson-c-dev \
   libelf-dev libreadline-dev cmake libcap-dev bison flex \
   pkg-config texinfo gdb libgrpc-dev python3-grpc-tools

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 addgroup --system --gid 92 frr
sudo addgroup --system --gid 85 frrvty
sudo adduser --system --ingroup frr --home /var/opt/frr/ \
   --gecos "FRR suite" --shell /bin/false 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 \
    --sysconfdir=/etc \
    --localstatedir=/var \
    --sbindir=/usr/lib/frr \
    --enable-multipath=64 \
    --enable-user=frr \
    --enable-group=frr \
    --enable-vty-group=frrvty \
    --enable-configfile-mask=0640 \
    --enable-logfile-mask=0640 \
    --enable-fpm \
    --with-pkg-git-version \
    --with-pkg-extra-version=-MyOwnFRRVersion
make
make check
sudo make install

For more compile options, see ./configure --help

Create empty FRR configuration files

sudo install -m 640 -o frr -g frr /dev/null /etc/frr/frr.conf
sudo install -m 640 -o frr -g frr tools/etc/frr/daemons /etc/frr/daemons

Edit /etc/frr/daemons and enable the FRR daemons for the protocols you need

Enable IP & 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

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

Troubleshooting

Shared library error

If you try and start any of the frrouting daemons you may see the below error due to the frrouting shared library directory not being found:

./zebra: error while loading shared libraries: libfrr.so.0: cannot open
shared object file: No such file or directory

The fix is to add the following line to /etc/ld.so.conf which will continue to reference the library directory after the system reboots. To load the library directory path immediately run the ldconfig command after adding the line to the file eg:

echo include /usr/local/lib >> /etc/ld.so.conf
ldconfig