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Update kernel
Install ELRepo Repository
rpm --import https://www.elrepo.org/RPM-GPG-KEY-elrepo.org
rpm -Uvh https://www.elrepo.org/elrepo-release-7.0-3.el7.elrepo.noarch.rpm
Install the new kernel and enable it
yum -y --enablerepo=elrepo-kernel install kernel-ml
grub2-set-default 0
reboot
Open BBR and reboot
echo "net.core.default_qdisc=fq" >> /etc/sysctl.conf
echo "net.ipv4.tcp_congestion_control=bbr" >> /etc/sysctl.conf
sysctl –p
Check for success
sysctl net.ipv4.tcp_available_congestion_control
sysctl net.ipv4.tcp_congestion_control
sysctl net.core.default_qdisc
lsmod | grep bbr
Delete the old kernel
yum -y remove kernel kernel-tools