[联动]VRRP+BFD联动

前言

VRRP 和 BFD 我在之前博客中配置过了，也在最近的BFD综合详细实验配置案例配置过，这次就拿出来单独做配置，方便各位学习

拓扑图

实验思路

1. 配置IP地址
2. 配置IGP-ospf
3. 配置VRRP
4. 配置BFD

实验步骤

1. 配置IP地址
   AR1

[AR1]int g0/0/0.10
[AR1-GigabitEthernet0/0/0.10]dot1q termination vid 10
[AR1-GigabitEthernet0/0/0.10]ip address 192.168.10.251 24	
[AR1-GigabitEthernet0/0/0.10]arp broadcast enable 
[AR1-GigabitEthernet0/0/0.10]q
[AR1]int g0/0/0.20
[AR1-GigabitEthernet0/0/0.20]dot1q termination vid 20
[AR1-GigabitEthernet0/0/0.20]ip address 192.168.20.251 24
[AR1-GigabitEthernet0/0/0.20]arp broadcast enable 
[AR1-GigabitEthernet0/0/0.20]q
[AR1]int g0/0/1
[AR1-GigabitEthernet0/0/1]ip address 12.1.1.1 24
[AR1-GigabitEthernet0/0/1]q
[AR1]

AR2

[AR2]int g0/0/0.10
[AR2-GigabitEthernet0/0/0.10]dot1q termination vid 10
[AR2-GigabitEthernet0/0/0.10]ip address 192.168.10.252 24
[AR2-GigabitEthernet0/0/0.10]arp broadcast enable 
[AR2-GigabitEthernet0/0/0.10]q
[AR2]int g0/0/0.20
[AR2-GigabitEthernet0/0/0.20]dot1q termination vid 20
[AR2-GigabitEthernet0/0/0.20]ip address 192.168.20.252 24
[AR2-GigabitEthernet0/0/0.20]arp broadcast enable 
[AR2-GigabitEthernet0/0/0.20]q
[AR2]int g0/0/1
[AR2-GigabitEthernet0/0/1]ip address 23.1.1.2 24
[AR2-GigabitEthernet0/0/1]q
[AR2]

AR3

[AR3]int g0/0/0
[AR3-GigabitEthernet0/0/0]ip address 12.1.1.3 24
[AR3-GigabitEthernet0/0/0]q
[AR3]int g0/0/1
[AR3-GigabitEthernet0/0/1]ip address 23.1.1.3 24
[AR3-GigabitEthernet0/0/1]q
[AR3]int lo0
[AR3-LoopBack0]ip address 3.3.3.3 32
[AR3-LoopBack0]q
[AR3]

LSW1

[LSW1]vlan batch 10 20 
[LSW1]int g0/0/1
[LSW1-GigabitEthernet0/0/1]p l a
[LSW1-GigabitEthernet0/0/1]p d v 10
[LSW1-GigabitEthernet0/0/1]q
[LSW1]int g0/0/2
[LSW1-GigabitEthernet0/0/2]p l a
[LSW1-GigabitEthernet0/0/2]p d v 20
[LSW1-GigabitEthernet0/0/2]q
[LSW1]int g0/0/3
[LSW1-GigabitEthernet0/0/3]p l t 
[LSW1-GigabitEthernet0/0/3]p t a v 10 20
[LSW1-GigabitEthernet0/0/3]q
[LSW1]int g0/0/4
[LSW1-GigabitEthernet0/0/4]p l t
[LSW1-GigabitEthernet0/0/4]p t a v 10 20
[LSW1-GigabitEthernet0/0/4]q
[LSW1]

2. 配置IGP-ospf
   AR1

[AR1]ospf router-id 1.1.1.1
[AR1-ospf-1]a 0
[AR1-ospf-1-area-0.0.0.0]network 192.168.10.0 0.0.0.255
[AR1-ospf-1-area-0.0.0.0]network 192.168.20.0 0.0.0.255	
[AR1-ospf-1-area-0.0.0.0]network 12.1.1.0 0.0.0.255
[AR1-ospf-1-area-0.0.0.0]q

AR2

[AR2]ospf router-id 2.2.2.2 
[AR2-ospf-1]a 0
[AR2-ospf-1-area-0.0.0.0]network 192.168.10.0 0.0.0.255	
[AR2-ospf-1-area-0.0.0.0]network 192.168.20.0 0.0.0.255
[AR2-ospf-1-area-0.0.0.0]network 23.1.1.0 0.0.0.255
[AR2-ospf-1-area-0.0.0.0]q

AR3

[AR3]ospf router-id 3.3.3.3
[AR3-ospf-1]a 0
[AR3-ospf-1-area-0.0.0.0]network 12.1.1.0 0.0.0.255
[AR3-ospf-1-area-0.0.0.0]network 23.1.1.0 0.0.0.255	
[AR3-ospf-1-area-0.0.0.0]network 3.3.3.3 0.0.0.0
[AR3-ospf-1-area-0.0.0.0]q

3. 配置VRRP
   AR1

[AR1]int g0/0/0.10	
[AR1-GigabitEthernet0/0/0.10]vrrp vrid 1 virtual-ip 192.168.10.254
[AR1-GigabitEthernet0/0/0.10]vrrp vrid 1 priority 200
[AR1-GigabitEthernet0/0/0.10]q
[AR1]int g0/0/0.20
[AR1-GigabitEthernet0/0/0.20]vrrp vrid 2 virtual-ip 192.168.20.254
[AR1-GigabitEthernet0/0/0.20]q

AR2

[AR2]int g0/0/0.10	
[AR2-GigabitEthernet0/0/0.10]vrrp vrid 1 virtual-ip 192.168.10.254
[AR2-GigabitEthernet0/0/0.10]q
[AR2]int g0/0/0.20
[AR2-GigabitEthernet0/0/0.20]vrrp vrid 2 virtual-ip 192.168.20.254	
[AR2-GigabitEthernet0/0/0.20]vrrp vrid 2 priority 200
[AR2-GigabitEthernet0/0/0.20]q

PC1 ping 3.3.3.3 如下图可以访问
![[Pasted image 20250101203142.png]]

当我们断开AR1与AR3之间的链路，还是可以访问，但是会出现中断问题

4. 配置BFD
   AR1

[AR1]bfd 
[AR1-bfd]q
[AR1]bfd vrrp bind peer-ip 12.1.1.3 source-ip 12.1.1.1 auto 
[AR1-bfd-session-vrrp]commit 
[AR1-bfd-session-vrrp]q
[AR1]int g0/0/0.10
//VRRP组1跟踪BFD会话，如果出现故障，优先级减少120，我们上面配置的200 优先级越大越优先
[AR1-GigabitEthernet0/0/0.10]vrrp vrid 1 track bfd-session session-name vrrp red
uced 120
[AR1-GigabitEthernet0/0/0.10]q
[AR1]

AR3

[AR3]bfd 
[AR3-bfd]q	
[AR3]bfd vrrp bind peer-ip 12.1.1.1 source-ip 12.1.1.3 auto 
[AR3-bfd-session-vrrp]commit 
[AR3-bfd-session-vrrp]q
[AR3]

实验验证

在AR1中查看VRRP信息

关闭AR3的G0/0/0的接口

[AR3]int g0/0/0	
[AR3-GigabitEthernet0/0/0]shutdown
[AR3-GigabitEthernet0/0/0]q