目录
实验需求
1、R1能访问23.0、24.0,同时能访问100.0以及R5的所有LOOPBACK接口
2、R1访问R5下属LOOPBACK接口时,数据流走向为R1、R2、R3、R5,同时确保往返路径一致
分析
EIGRP和RIP不关自动汇总:
先看EIGRP,R1会把172.16.1.1/24的路由汇总成172.16.0.0/16发给R2。再看RIP,重分布进RIP的路由,因为有自动汇总,到达R2会是以172.16.0.0/16的形式展现
由于EIGRP的AD值比RIP低,所以R2路由表上展示的是从R1来的172.16.0.0/16。(RIP自动汇总本地有效)
EIGRP关闭自动汇总,RIP开启自动汇总:
先看EIGRP,172.16.1.1/24的路由在R2的 eigrp topology里面是这样展示的:
出现的问题1:在R2、R5的RIP的数据库里面都有/24和/16的路由,为什么路由表里就显示最长掩码的,是更精确吗?
现在知道R2会把172.16.1.1/24汇总给R3,R3又汇总给R5,那么可以将R2,R3关闭自动汇总,R3传递172.16.1.1/24的路由给R5就是明细,而R5又开启自动汇总,传递给R3的将是汇总路由,可以看到都正常了
EIGRP开启自动汇总,RIP关闭自动汇总:
EIGRP和RIP都关闭自动汇总:
小结
有连续的网段重分布进协议可以在重发布的路由器上做自动汇总,单个或者不连续的网段可以关闭自动汇总。
代码
R1:
!
interface Loopback0
ip address 172.16.1.1 255.255.255.0
!
interface FastEthernet0/0
ip address 192.168.12.1 255.255.255.0
duplex auto
speed auto
!
router eigrp 100
network 172.16.0.0
network 192.168.12.0
no auto-summary
!
R2:
!
interface FastEthernet0/0
ip address 192.168.12.2 255.255.255.0
duplex auto
speed auto
!
interface Serial1/0
ip address 192.168.23.2 255.255.255.0
serial restart-delay 0
!
interface Serial1/1
ip address 192.168.24.2 255.255.255.0
serial restart-delay 0
!
router eigrp 100
redistribute rip metric 1000 100 255 10 1
redistribute ospf 1 metric 1000 100 255 10 1
network 192.168.12.0
no auto-summary
!
router ospf 1
log-adjacency-changes
redistribute eigrp 100 subnets
network 192.168.24.2 0.0.0.0 area 0
!
router rip
version 2
redistribute eigrp 100 metric 2
network 192.168.23.0
no auto-summary
!
R3:
!
interface FastEthernet0/0
ip address 192.168.100.3 255.255.255.0
duplex auto
speed auto
!
interface Serial1/0
ip address 192.168.23.3 255.255.255.0
serial restart-delay 0
!
router rip
version 2
network 192.168.23.0
network 192.168.100.0
no auto-summary
!
R4:
!
interface Loopback0
ip address 172.16.4.1 255.255.255.0
!
interface FastEthernet0/0
ip address 192.168.100.4 255.255.255.0
duplex auto
speed auto
!
interface Serial1/0
ip address 192.168.24.4 255.255.255.0
serial restart-delay 0
!
router ospf 1
log-adjacency-changes
network 192.168.24.4 0.0.0.0 area 0
!
R5:
!
interface Loopback0
ip address 172.16.65.1 255.255.255.0
!
interface Loopback1
ip address 172.16.66.1 255.255.255.0
!
interface Loopback2
ip address 172.16.67.1 255.255.255.0
!
interface FastEthernet0/0
ip address 192.168.100.5 255.255.255.0
duplex auto
speed auto
!
router rip
version 2
redistribute connected metric 2
network 192.168.100.0
!