前言
如果要在vpp上启用ospf，当前选择的是frrouting。业务模型是
和之前一篇vpp+wg实现三层转发一样，不过之前是通过静态路由实现，这次通过动态路由实现。
配置
vpp设备配置
- vpp中接口配置
## 打开镜像开关
sudo vppctl lcp lcp-sync on
## 配置wan口，对应的内核接口eth1
sudo vppctl lcp create GigabitEthernet3/0/0 host-if eth1
sudo ip link set dev eth1 up
sudo ip link set mtu 1500 dev eth1
sudo ip address add 10.10.10.1/24 dev eth1
## 配置wg隧道
sudo vppctl wireguard create listen-port 9999 private-key wNw3zMmL/MSvnlIZ+dBnJkHCD5gMEP1HS0cU5gHdhnM= src 10.10.10.1
sudo vppctl lcp create wg0 host-if wg0 tun
sudo vppctl wireguard peer add wg0 public-key rFHqtOHXmAlhat+xHk3XI1WpFy8CJv87S1XIPjDD1HA= allowed-ip 0.0.0.0/0 persistent-keepalive 25
sudo ip link set dev wg0 up
sudo ip link set mtu 1420 dev wg0
sudo ip address add 40.40.42.1/30 dev wg0
sudo ip route add 40.40.42.2/32 dev wg0
## 配置lan口， 对应的内核接口是eth2
sudo vppctl lcp create GigabitEthernet1b/0/0 host-if eth2
sudo ip link set dev eth2 up
sudo ip link set mtu 1500 dev eth2
sudo ip address add 172.16.1.3/24 dev eth2
- ospf配置
interface wg0
ip ospf network non-broadcast
exit
!
router ospf
ospf router-id 192.168.152.133
network 40.40.42.0/30 area 0
network 172.16.1.0/24 area 0
neighbor 40.40.42.2
exit
此处，将wg接口类型改成了NBMA，它默认是点对点的，但是vpp中的wg接口一直发不出去组播报文（除非配一条组播的明细路由），所以采用NBMA。
CPE配置
- 接口配置
config interface 'wan'
option type 'ovs-bridge'
option proto 'static'
option ipaddr '10.10.10.2'
option netmask '255.255.255.0'
option gateway '10.10.10.1'
list ifname 'eth1'
config interface 'seth2'
option type 'ovs-bridge'
option proto 'static'
option ipaddr '192.168.73.4'
option netmask '255.255.255.0'
list ifname 'eth2'
config interface 'wg1'
option proto 'wireguard'
option private_key 'CCX+tFOKNPMQg2nhH/7PNGcCp6ycKC/JtX2Y2m4Rw1c='
list addresses '40.40.42.2/30'
config wireguard_wg1 'wgserver1'
option public_key 'bzbI5vzSogyEOqlQBeElu7A3kipdlI6NFGdMUzTnzWw='
option endpoint_host '10.10.10.1'
option endpoint_port '9999'
option route_allowed_ips '1'
option persistent_keepalive '25'
list allowed_ips '0.0.0.0/0'
- ospf 配置
interface wg1
ip ospf network non-broadcast
!
router ospf
ospf router-id 192.168.152.136
network 40.40.42.0/30 area 0
network 192.168.73.0/24 area 0
neighbor 40.40.42.1
同样，wg接口修改成NBMA。
状态
- 邻居正常建立
show ip ospf neighbor
Neighbor ID Pri State Dead Time Address Interface RXmtL RqstL DBsmL
192.168.152.133 1 Full/Backup 39.867s 40.40.42.1 wg1:40.40.42.2 0 0 0
- 能学习到对端lan侧路由 CPE:学到172.16.1.0/24路由：
show ip ospf route
============ OSPF network routing table ============
N 40.40.42.0/30 [10] area: 0.0.0.0
directly attached to wg1
N 172.16.1.0/24 [20] area: 0.0.0.0
via 40.40.42.1, wg1
N 192.168.73.0/24 [10] area: 0.0.0.0
directly attached to br-seth2
HUB:学到192.168.73.0/24路由：
vpp# show ip ospf route
============ OSPF network routing table ============
N 40.40.42.0/30 [10] area: 0.0.0.0
directly attached to wg0
N 172.16.1.0/24 [10] area: 0.0.0.0
directly attached to eth2
N 192.168.73.0/24 [20] area: 0.0.0.0
via 40.40.42.2, wg0
其间遇到一个问题，HUB上学到的路由是inactive，将frr源码(最新代码)编译正常学习到路由，见文章源码编译frr
