简介

FRR 是一个路由软件套件,它衍生自 Quagga,并在 GNU GPL2 许可下分发。与 Quagga 一样,它为类 Unix 平台提供了所有主要路由协议的实现,例如 OSPF、 路由信息协议(Routing Information Protocol)(RIP)、 边界网关协议(Border Gateway Protocol)(BGP) 和 中间系统到中间系统(Intermediate system-to-intermediate system) (IS-IS)。

FRRouting(FRR)是用于Linux和Unix平台的IP路由协议套件,其中 包括BGP,IS-IS,LDP,OSPF,PIM和RIP的协议守护程序。FRR与本机Linux / Unix IP网络堆栈的无缝集成 使其适用于各种用例,包括将 主机/ VM /容器连接到网络,广告网络服务,LAN 交换和路由,Internet接入路由器以及Internet对等。FRR起源于Quagga项目。实际上,它是由许多Quagga长期开发人员开始的,他们共同努力以改善Quagga的行之有效的基础,以创建可用的最佳路由协议堆栈。

官网文档http://docs.frrouting.org/en/latest/overview.html

演示步骤

TIP:代码块#开头为全部主机都需配置,[[email protected] ~]#开头则为对应主机

环境

主机网卡IPgw
server01enp0s3192.168.1.11192.168.1.1
server02enp0s3---enp0s8192.168.1.12---172.25.0.6192.168.1.1---172.25.0.1
server03enp0s3---enp0s8 172.25.0.5---192.168.56.102172.25.0.1---192.168.56.1

目标

server01和server02可以访问server03的192.168.56.102

路由流程:
(1)server01--enp0s3-->enp0s3--server02--enp0s8-->enp0s3--server03--enp0s8
(2)server03--enp0s3-->enp0s8--server02--enp0s3-->enp0s3--server01

查看路由表状态

[[email protected] ~]# route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         192.168.1.1     0.0.0.0         UG    100    0        0 enp0s3

192.168.1.0     0.0.0.0         255.255.255.0   U     100    0        0 enp0s3

[[email protected] ~]# route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         192.168.1.1     0.0.0.0         UG    100    0        0 enp0s3
0.0.0.0         172.25.0.1      0.0.0.0         UG    101    0        0 enp0s8
172.25.0.0      0.0.0.0         255.255.255.0   U     101    0        0 enp0s8
192.168.1.0     0.0.0.0         255.255.255.0   U     100    0        0 enp0s3

[[email protected] ~]# route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         172.25.0.1      0.0.0.0         UG    100    0        0 enp0s3
172.25.0.0      0.0.0.0         255.255.255.0   U     100    0        0 enp0s3
192.168.56.0    0.0.0.0         255.255.255.0   U     101    0        0 enp0s8


安装frr软件

# FRRVER="frr-8"
# curl -O https://rpm.frrouting.org/repo/$FRRVER-repo-1-0.el8.noarch.rpm
# sudo yum install ./$FRRVER*
# sudo yum install frr frr-pythontools

配置frr

# sed -i "s/ospfd=no/ospfd=yes/" /etc/frr/daemons
# systemctl enable frr && systemctl start frr

配置ospf路由

[[email protected] ~]# vtysh
config t
router ospf
network 192.168.1.0/24 area 0
end
do write file
exit

[[email protected] ~]# vtysh
config t
router ospf
network 192.168.1.0/24 area 0
network 172.25.0.0/24 area 0
end
do write file
exit

[[email protected] ~]# vtysh
config t
router ospf
network 172.25.0.0/24 area 0
network 192.168.56.0/24 area 0
end
do write file
exit

配置路由转发

[[email protected] ~]# echo "net.ipv4.ip_forward=1" > /etc/sysctl.conf
[[email protected] ~]# sysctl -p

由于数据在server02上中转,仅配置server02

注意:frr服务执行restart后转发配置会失效,需要重新执行sysctl -p

查看路由

[[email protected] ~]# route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         192.168.1.1     0.0.0.0         UG    100    0        0 enp0s3
172.25.0.0      192.168.1.12    255.255.255.0   UG    20     0        0 enp0s3
192.168.1.0     0.0.0.0         255.255.255.0   U     100    0        0 enp0s3
192.168.56.0    192.168.1.12    255.255.255.0   UG    20     0        0 enp0s3

[[email protected] ~]# route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         192.168.1.1     0.0.0.0         UG    100    0        0 enp0s3
0.0.0.0         172.25.0.1      0.0.0.0         UG    101    0        0 enp0s8
172.25.0.0      0.0.0.0         255.255.255.0   U     101    0        0 enp0s8
192.168.1.0     0.0.0.0         255.255.255.0   U     100    0        0 enp0s3
192.168.56.0    172.25.0.5      255.255.255.0   UG    20     0        0 enp0s8

[[email protected] ~]# route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         172.25.0.1      0.0.0.0         UG    100    0        0 enp0s3
172.25.0.0      0.0.0.0         255.255.255.0   U     100    0        0 enp0s3
192.168.1.0     172.25.0.6      255.255.255.0   UG    20     0        0 enp0s3
192.168.56.0    0.0.0.0         255.255.255.0   U     101    0        0 enp0s8

验证

# ping -c 1 10.0.3.15 && echo "connect success" || echo "connect fail"