EIGRP分流互备实验

问题：AB去R1走R3 ，R4备份CD 去R1走R4，R3备份A去C走R3，R4备份B去D走R4，R3不能提供备份来回路径一致解决方法1、 EIGRP选路主要受延时和带宽的影响，通过修改延时解决AB

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问题：
AB去R1走R3 ，R4备份
CD 去R1走R4，R3备份
A去C走R3，R4备份
B去D走R4，R3不能提供备份
来回路径一致

解决方法
1、 EIGRP选路主要受延时和带宽的影响，通过修改延时解决AB访问公网R1的选路，CD同理
R4
interface Serial0/1
delay 2001

R5
interface Serial0/1
delay 2001
2、 通过偏移列表影响AB互访的路径（来去路径都要做）
R5
router eigrp 90
offset-list 1 in 10 Serial0/1

access-list 1 permit 172.16.69.0 0.0.0.255

R6
router eigrp 90
offset-list 1 in 10 Serial0/1

 access-list 1 permit 172.16.57.0 0.0.0.255

3、 通过分发列表阻止BD通过R3
R5
router eigrp 90
distribute-list 2 in Serial0/0

access-list 2 deny 172.16.60.0 0.0.0.255
access-list 2 permit any
R6
router eigrp 90
distribute-list 2 in Serial0/0

  access-list 2 deny   172.16.58.0 0.0.0.255

access-list 2 permit any
4、 由于本实验需要访问公网，存在访问公网的的默认路由，故只有分发列表无法阻止，可以通过静态放空通过R3的备份（注意：由于EIGRP支持宣告静态，故R5和R6需要做EIGRP的精确宣告）
R5
ip route 172.16.60.0 255.255.255.0 Null0 100
R6
ip route 172.16.58.0 255.255.255.0 Null0 100

详细配置命令

R1
interface Loopback0
ip address 1.1.1.1 255.255.255.0

interface Serial0/0
ip address 12.1.1.1 255.255.255.0

R2
interface Loopback0
ip address 172.16.2.2 255.255.255.0

interface Serial0/0
ip address 12.1.1.2 255.255.255.0
ip nat outside

interface Serial0/1
ip address 172.16.23.1 255.255.255.0
ip nat inside

interface Serial0/2
ip address 172.16.24.1 255.255.255.0
ip nat inside

inrouter eigrp 90
network 172.16.0.0
redistribute static metric 1544 100 255 1 1500

ip nat inside source list 1 interface Serial0/0 overload
ip route 0.0.0.0 0.0.0.0 Serial0/0

access-list 1 permit 172.16.0.0 0.0.255.255

R3
interface Loopback0
ip address 172.16.3.3 255.255.255.0

interface Serial0/0
ip address 172.16.23.2 255.255.255.0

interface Serial0/1
ip address 172.16.35.1 255.255.255.0

interface Serial0/2
ip address 172.16.36.1 255.255.255.0
delay 2001

router eigrp 90
network 172.16.0.0

R4
interface Loopback0
ip address 172.16.4.4 255.255.255.0

interface Serial0/0
ip address 172.16.24.2 255.255.255.0

interface Serial0/1
ip address 172.16.45.1 255.255.255.0
delay 2001

interface Serial0/2
ip address 172.16.46.1 255.255.255.0
serial restart-delay 0

router eigrp 90
network 172.16.0.0

R5
interface Loopback0
ip address 172.16.5.5 255.255.255.0

interface Serial0/0
ip address 172.16.35.2 255.255.255.0

interface Serial0/1
ip address 172.16.45.2 255.255.255.0
delay 2001

interface Serial0/2
ip address 172.16.57.1 255.255.255.0

interface Serial0/3
ip address 172.16.58.1 255.255.255.0

router eigrp 90
distribute-list 2 in Serial0/0
network 172.16.35.0 0.0.0.255
network 172.16.45.0 0.0.0.255
network 172.16.57.0 0.0.0.255
network 172.16.58.0 0.0.0.255
offset-list 1 in 10 Serial0/1

ip route 172.16.60.0 255.255.255.0 Null0 100

access-list 1 permit 172.16.69.0 0.0.0.255
access-list 2 deny 172.16.60.0 0.0.0.255
access-list 2 permit any

R6
interface Loopback0
ip address 172.16.6.6 255.255.255.0

interface Serial0/0
ip address 172.16.36.2 255.255.255.0
delay 2001

interface Serial0/1
ip address 172.16.46.2 255.255.255.0

interface Serial0/2
ip address 172.16.69.1 255.255.255.0

interface Serial0/3
ip address 172.16.60.1 255.255.255.0

router eigrp 90
distribute-list 2 in Serial0/0
network 172.16.36.0 0.0.0.255
network 172.16.46.0 0.0.0.255
network 172.16.60.0 0.0.0.255
network 172.16.69.0 0.0.0.255
offset-list 1 in 10 Serial0/1

ip route 172.16.58.0 255.255.255.0 Null0 100

access-list 1 permit 172.16.57.0 0.0.0.255
access-list 2 deny 172.16.58.0 0.0.0.255
access-list 2 permit any

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