以前为了全表或者收发表基本都是bird，或者用gobgp做控制，但是在想用一些功能的时候，还是喜欢FRR（早知道还得原道）

用法1：全部路由都不写入Fib

route-map DENY deny 100
ip protocol bgp route-map DENY 
ipv6 protocol bgp route-map DENY 

你需要先定义一个拒绝全部的Route-map，应用在protocol即可，当然您可以根据route-map来决定哪些路由写进fib。

如果要在vrf应用，需要在vrf下面敲入这个命令

坑：不能通过BGP Community匹配

一开始我想通过收到的Community匹配那些写Fib，那些不写，但是经过测试（漏了两次之后）发现你在route-map里面匹配community是无效的。

实战案例：客户（下游）写入fib、上游只写入rib、给客户导出全表

ip prefix-list CustomerV4 permit 10.0.0.0/24
ipv6 prefix-list CustomerV6 permit 2400::/48
route-map FIB:Import permit 100
 match ip address prefix-list CustomerV4
exit
!
route-map FIB:Import permit 105
 match ipv6 address prefix-list CustomerV6
exit
!
route-map ALLOW permit 100
!
route-map UPSTREAM:EXPORT permit 100
 match ip address prefix-list CustomerV4
!
route-map UPSTREAM:EXPORT permit 105
 match ipv6 address prefix-list CustomerV6
!
router bgp 65525
 bgp router-id 11.4.5.14
 no bgp default ipv4-unicast
 neighbor 10.0.0.1 remote-as 65526
 neighbor 10.0.0.1 description "UPStream Full Table"
 neighbor 11.0.0.1 remote-as 65526
 neighbor 11.0.0.1 description "Downstream Full Table"
 neighbor 2400::1 remote-as 65526
 neighbor 2400::1 description "UPStream Full Table"
 !
 address-family ipv4 unicast
  network 11.4.5.14/32
  neighbor 10.0.0.1 activate
  neighbor 10.0.0.1 soft-reconfiguration inbound
  neighbor 10.0.0.1 route-map ALLOW in
  neighbor 10.0.0.1 route-map UPSTREAM:EXPORT out
  neighbor 11.0.0.1 activate
  neighbor 11.0.0.1 soft-reconfiguration inbound
  neighbor 11.0.0.1 route-map ALLOW in
  neighbor 11.0.0.1 route-map ALLOW out
 address-family ipv6 unicast
  neighbor 2400::1 activate
  neighbor 2400::1 soft-reconfiguration inbound
  neighbor 2400::1 route-map ALLOW in
  neighbor 2400::1 route-map UPSTREAM:EXPORT out

只是作为最小案例配置且单上游环境、环境变更请自行修改