BFD的应用实验

BFD实验记录

1、BFD联动静态路由

路由器	端口	IP地址
R1	0/0/0	192.168.12.1/24
R1	0/0/1	192.168.13.1/24
R2	0/0/0	192.168.12.2/24
R2	0/0/1	192.168.234.2/24
R3	0/0/0	192.168.234.3/24
R4	0/0/0	192.168.13.2/24
R4	0/0/1	192.168.234.4/24

	R1:
		[r1]bfd
		[r1-bfd]q
		[r1]bfd 1 bind peer-ip 192.168.12.2 source 192.168.12.1
		[r1-bfd-session-1]discriminator local 1
		[r1-bfd-session-1]discriminator remote 2
		[r1-bfd-session-1]commit
		[r1-bfd-session-1]q
		
	R2:
		[r2]bfd
		[r2-bfd]q
		[r2]bfd 1 bind peer-ip 192.168.12.1 source 192.168.12.2
		[r2-bfd-session-1]discriminator local 2
		[r2-bfd-session-1]discriminator remote 1
		[r2-bfd-session-1]commit
		[r2-bfd-session-1]q

	R1:
		[r1]ip route-static 192.168.234.0 24 192.168.12.2 track bfd-session 1
		[r1]ip route-static 192.168.234.0 24 192.168.13.2 preference 100

	R3:
		[r3]ip route-static 192.168.12.0 24 192.168.234.2
		[r3]ip route-static 192.168.13.0 24 192.168.234.4

验证：断掉交换机LSW1的0/0/2接口，看是否能到达192.168.234.3

2、BFD与OSPF联动

路由器	端口	IP地址
R1	0/0/0	192.168.12.1
R2	0/0/0	192.168.12.2
R2	0/0/1	192.168.23.1
R3	0/0/0	192.168.23.2

		R1:
			[r1-GigabitEthernet0/0/0]ospf 1 rou 1.1.1.1
			[r1-ospf-1]ar 0
			[r1-ospf-1-area-0.0.0.0]network 192.168.12.0 0.0.0.255
			[r1-ospf-1-area-0.0.0.0]q
			[r1-ospf-1]bfd all-interfaces enable
			[r1-ospf-1]bfd all-interfaces min-rx-interval 100 min-tx-interval 100 detect-multiplier 3

		R2:
			[r2-GigabitEthernet0/0/1]ospf 1 rou 2.2.2.2
			[r2-ospf-1]ar 0
			[r2-ospf-1-area-0.0.0.0]network 192.168.12.0 0.0.0.255
			[r2-ospf-1-area-0.0.0.0]network 192.168.23.0 0.0.0.255
			[r2-ospf-1-area-0.0.0.0]q
			[r2-ospf-1]bfd all-interfaces enable 
			[r2-ospf-1]bfd all-interfaces min-rx-interval 100 min-tx-interval 100 detect-multiplier 3
		
		R3:
			[r3-GigabitEthernet0/0/0]ospf 1 rou 3.3.3.3
			[r3-ospf-1]ar 0
			[r3-ospf-1-area-0.0.0.0]network 192.168.23.0 0.0.0.255
			[r3-ospf-1-area-0.0.0.0]q
			[r3-ospf-1]bfd all-interfaces enable 
			[r3-ospf-1]bfd all-interfaces min-rx-interval 100 min-tx-interval 100 detect-multiplier 3

验证：
	将交换机LSW1的0/0/2接口shutdown，看R1和R2的邻居关系是不是立即断开

3、BFD的单臂回声

路由器	接口	IP地址
R1	/0/0/0	192.168.12.1/24
R1	loopback 0	1.1.1.1/32
R2	/0/0/0	192.168.12.2/24
R2	loopback 0	2.2.2.2/32

		将R2假设为不支持BFD的服务器，单臂回声只有必要配一个本地标识，和一个传送的频率
		R1:
			[r1]bfd
			[r1-bfd]q
			[r1]bfd 1 bind peer-ip 192.168.12.2 interface GigabitEthernet 0/0/0 one-arm-echo
			[r1-bfd-session-1]discriminator local  1
			[r1-bfd-session-1]commit 


验证:看BFD是否UP
	[r1]display bfd session all verbose 

4、BFD和VRRP联动

	PC配置

路由器	接口	IP地址
R1	0/0/1	192.168.100.1
R1	0/0/0	192.168.13.1
R2	0/0/1	192.168.100.2
R2	0/0/0	192.168.24.1
(R1,R2)	VRRP 1	192.168.100.254
R3	0/0/0	192.168.35.1
R3	0/0/1	192.168.13.2
R4	0/0/0	192.168.45.1
R4	0/0/1	192.168.24.2
R5	0/0/0	192.168.35.2
R5	0/0/0	192.168.45.2
R5	loopback 0	5.5.5.5

路由打通用OSPF
配置VRRP
	R1：
		[r1]int g 0/0/1
		[r1-GigabitEthernet0/0/1]vrrp vrid 1 virtual-ip 192.168.100.254
		[r1-GigabitEthernet0/0/1]vrrp vrid  1 priority 120
		[r1-GigabitEthernet0/0/1]vrrp vrid 1 preempt-mode timer delay 15
	R2:
		[r2]int g 0/0/1
		[r2-GigabitEthernet0/0/1]vrrp vrid 1 virtual-ip 192.168.100.254
		[r2-GigabitEthernet0/0/1]vrrp vrid  1 priority 100
		[r2-GigabitEthernet0/0/1]vrrp vrid 1 preempt-mode timer delay 15

验证

走的是R1，现在模拟链路故障，在R3上将0/0/0接口断开，再次tracert 5.5.5.5

路由线路不是走R2->R4->R5，而是R1->R2->R4->R5，这是因为vrrp检测不到链路出现了故障，现在配置BFD检测链路状况与VRRP联动
配置BFD
	R1：
		[r1]bfd
		[r1-bfd]q
		[r1]bfd 1to5 bind peer-ip 192.168.35.2
		[r1-bfd-session-1to5]discriminator local 1
		[r1-bfd-session-1to5]discriminator remote 2
		[r1-bfd-session-1to5]min-rx-interval 10
		[r1-bfd-session-1to5]min-tx-interval 10
		[r1-bfd-session-1to5]commit
	
	R5：
		[r5]bfd
		[r5-bfd]q
		[r5]bfd 1to5 bind peer-ip 192.168.100.1
		[r5-bfd-session-1to5]discriminator local 2
		[r5-bfd-session-1to5]discriminator remote 1
		[r5-bfd-session-1to5]min-rx-interval 10
		[r5-bfd-session-1to5]min-tx-interval 10
		[r5-bfd-session-1to5]commit
在R1VRRP中联动BFD
	R1：
		[r1]int g 0/0/1
		[r1-GigabitEthernet0/0/1]vrrp vrid 1 track bfd-session 1 reduced 50

验证：模拟R3与R5之间链路出现故障，用PC去ping 5.5.5.5，看经过的路径

现在的路由路径为R2->R4->R5，证明BFD起了作用