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Building FRR on CentOS 6 from Git Source
========================================
Instructions are tested with `CentOS 6.8` on `x86_64` platform
CentOS 6 restrictions:
----------------------
- PIMd is not supported on `CentOS 6`. Upgrade to `CentOS 7` if PIMd is needed
- MPLS is not supported on `CentOS 6`. MPLS requires Linux Kernel 4.5 or higher
(LDP can be built, but may have limited use without MPLS)
Install required packages
-------------------------
Add packages:
sudo yum install git autoconf automake libtool make gawk readline-devel \
texinfo net-snmp-devel groff pkgconfig json-c-devel pam-devel \
flex pytest
Install newer version of bison (CentOS 6 package source is too old) from CentOS 7
curl -O http://vault.centos.org/7.0.1406/os/Source/SPackages/bison-2.7-4.el7.src.rpm
rpmbuild --rebuild ./bison-2.7-4.el7.src.rpm
sudo yum install ./rpmbuild/RPMS/x86_64/bison-2.7-4.el6.x86_64.rpm
rm -rf rpmbuild
Install newer version of autoconf and automake (Package versions are too old)
curl -O http://ftp.gnu.org/gnu/autoconf/autoconf-2.69.tar.gz
tar xvf autoconf-2.69.tar.gz
cd autoconf-2.69
./configure --prefix=/usr
make
sudo make install
cd ..
curl -O http://ftp.gnu.org/gnu/automake/automake-1.15.tar.gz
tar xvf automake-1.15.tar.gz
cd automake-1.15
./configure --prefix=/usr
make
sudo make install
cd ..
Install `Python 2.7` in parallel to default 2.6 (needed for `make check` to run unittests).
Pick correct EPEL based on CentOS version used. Then install current `pytest`
rpm -ivh http://dl.fedoraproject.org/pub/epel/6/x86_64/epel-release-6-8.noarch.rpm
rpm -ivh https://centos6.iuscommunity.org/ius-release.rpm
yum install python27 python27-pip
pip2.7 install pytest
Please note that `CentOS 6` needs to keep python pointing to version 2.6 for `yum` to keep
working, so don't create a symlink for python2.7 to python
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 -g 92 frr
sudo groupadd -r -g 85 frrvt
sudo useradd -u 92 -g 92 -M -r -G frrvt -s /sbin/nologin \
-c "FRR FreeRangeRouting suite" -d /var/run/frr frr
### Download Source, configure and compile it
(You may prefer different options on configure statement. These are just an example.)
You may want to pay special attention to `/usr/lib64` paths and change them if you are not building on a x86_64 architecture
git clone https://github.com/freerangerouting/frr.git frr
cd frr
git checkout stable/2.0
./bootstrap.sh
./configure \
--sysconfdir=/etc/frr \
--libdir=/usr/lib64/frr \
--libexecdir=/usr/lib64/frr \
--localstatedir=/var/run/frr \
--disable-pimd \
--enable-snmp=agentx \
--enable-multipath=64 \
--enable-ospfclient=yes \
--enable-ospfapi=yes \
--enable-user=frr \
--enable-group=frr \
--enable-vty-group=frrvt \
--enable-rtadv \
--disable-exampledir \
--enable-watchfrr \
--enable-tcp-zebra \
--enable-fpm \
--with-pkg-git-version \
--with-pkg-extra-version=-MyOwnFRRVersion
make
make check PYTHON=/usr/bin/python2.7
sudo make install
### Create empty FRR configuration files
sudo mkdir /var/log/frr
sudo mkdir /etc/frr
sudo touch /etc/frr/zebra.conf
sudo touch /etc/frr/bgpd.conf
sudo touch /etc/frr/ospfd.conf
sudo touch /etc/frr/ospf6d.conf
sudo touch /etc/frr/isisd.conf
sudo touch /etc/frr/ripd.conf
sudo touch /etc/frr/ripngd.conf
sudo chown -R frr:frr /etc/frr/
sudo touch /etc/frr/vtysh.conf
sudo chown frr:frrvt /etc/frr/vtysh.conf
sudo chmod 640 /etc/frr/*.conf
### Enable IP & IPv6 forwarding
Edit `/etc/sysctl.conf` and set the following values (ignore the other settings)
# Controls IP packet forwarding
net.ipv4.ip_forward = 1
net.ipv6.conf.all.forwarding=1
# Controls source route verification
net.ipv4.conf.default.rp_filter = 0
**Reboot** or use `sysctl` to apply the same config to the running system
### Add init.d startup files
sudo cp redhat/bgpd.init /etc/init.d/bgpd
sudo cp redhat/isisd.init /etc/init.d/isisd
sudo cp redhat/ospfd.init /etc/init.d/ospfd
sudo cp redhat/ospf6d.init /etc/init.d/ospf6d
sudo cp redhat/ripngd.init /etc/init.d/ripngd
sudo cp redhat/ripd.init /etc/init.d/ripd
sudo cp redhat/zebra.init /etc/init.d/zebra
sudo chkconfig --add zebra
sudo chkconfig --add ripd
sudo chkconfig --add ripngd
sudo chkconfig --add ospf6d
sudo chkconfig --add ospfd
sudo chkconfig --add bgpd
sudo chkconfig --add isisd
### Enable required daemons at startup
Only enable zebra and the daemons which are needed for your setup
sudo chkconfig zebra on
sudo chkconfig ospfd on
sudo chkconfig bgpd on
[...] etc (as needed)
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