學習回顧—靜态路由配置與管理(4)-靜态路由與BFD關聯的配置示例

【實驗要求】RouterA通過配置靜态路由，經由RouterB與外部相連，其中RouterA與RouterB之間通過二層交換機SwitchC互連。現要求RouterA能正常通路外部網絡，且要在RouterA和RouterB之間實作毫秒級故障感覺，提高收斂速度。

【Router-A配置】

interface GigabitEthernet1/0/0

ip address 1.1.1.1 255.255.255.0

#

interface GigabitEthernet2/0/0

ip address 192.168.1.1 255.255.255.0

#

bfd aa bind peer-ip 1.1.1.2

discriminator local 10

discriminator remote 20

commit

#

ip route-static 0.0.0.0 0.0.0.0 1.1.1.2 track bfd-session aa

#

【Router-B配置】

interface GigabitEthernet1/0/0

ip address 1.1.1.2 255.255.255.0

#

interface GigabitEthernet2/0/0

ip address 2.2.2.2 255.255.255.0

#

bfd bb bind peer-ip 1.1.1.1

discriminator local 20

discriminator remote 10

commit

#

ip route-static 192.168.1.0 255.255.255.0 1.1.1.1

#

【驗證結果】

l 在RouterA和RouterB上執行display bfd session all

<Router-A>display bfd session all

---------------------------------------------------------------------

Local Remote PeerIpAddr State Type InterfaceName

---------------------------------------------------------------------

10 20 1.1.1.2 Up S_IP_PEER -

---------------------------------------------------------------------

Total UP/DOWN Session Number : 1/0

<Router-B>display bfd session all

---------------------------------------------------------------------

Local Remote PeerIpAddr State Type InterfaceName

---------------------------------------------------------------------

20 10 1.1.1.1 Up S_IP_PEER -

---------------------------------------------------------------------

Total UP/DOWN Session Number : 1/0

l 路由驗證

[Router-A]display ip routing-table | exclude 127.0.0.1

Route Flags: R - relay, D - download to fib

---------------------------------------------------------------------

Routing Tables: Public

Destinations : 11 Routes : 11

Destination/Mask Proto Pre Cost Flags NextHop Interface

0.0.0.0/0 Static 60 0 RD 1.1.1.2 GigabitEthernet1/0/0

1.1.1.0/24 Direct 0 0 D 1.1.1.1 GigabitEthernet1/0/0

192.168.1.0/24 Direct 0 0 D 192.168.1.1 GigabitEthernet2/0/0

對RouterB的GE1/0/0接口執行shutdown指令模拟鍊路故障。然後檢視RouterA的路由表，發現除了直連路由，靜态預設路由不存在了。

<Router-A>display ip routing-table | exclude 127.0.0.1

Route Flags: R - relay, D - download to fib

---------------------------------------------------------------------

Routing Tables: Public

Destinations : 11 Routes : 10

Destination/Mask Proto Pre Cost Flags NextHop Interface

1.1.1.0/24 Direct 0 0 D 1.1.1.1 GigabitEthernet1/0/0

192.168.1.0/24 Direct 0 0 D 192.168.1.1 GigabitEthernet2/0/0