Solved: Closing connection because of an I/O error in FRR - at least in Ubuntu

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 If you are getting this message in FRR:

Closing connection because of an I/O error in FR

The solution is straight forward. You have to compile FRR with this flag:

--enable-systemd

So, it would be something like:

./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 \

    --enable-systemd

    --with-pkg-extra-version=-MyOwnFRRVersion

you can follow those instructions and adding my previous solution:

http://docs.frrouting.org/projects/dev-guide/en/latest/building-frr-for-ubuntu2004.html