CCNP实验二：EIGRP手动汇总
1. EIGRP配置实验手动汇总
1.1. 文档介绍
本文档主要讲述了
EIGRP
的手动汇总。
EIGRP
默认是使用自动汇总。自动汇总在不连续子网、次有路由选择上存在问题，因此需要我们对
EIGRP
路由进行手动汇总。
1.2. 实验拓扑
1.3. 实验配置
1.3.1. R1
R1#sh run
Building configuration...
Current configuration : 1276 bytes
!
version 12.4
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname R1
!
boot-start-marker
boot-end-marker
!
ip cef
multilink bundle-name authenticated
!
//
启用三个
loopback
口
!
interface Loopback0
ip address 1.1.1.1 255.255.255.0
!
interface Loopback1
ip address 1.1.2.1 255.255.255.0
!
interface Loopback2
ip address 1.1.3.1 255.255.255.0
!
interface FastEthernet0/0 //
连
R2f0/0
ip address 12.1.1.1 255.255.255.0
ip summary-address eigrp 1 1.1.0.0 255.255.0.0 5
//
在路由出口汇总三个
loopback
口的子网为
16
位
duplex auto
speed auto
!
router eigrp 1
network 1.0.0.0
network 12.0.0.0 0.0.0.255
network 12.0.0.0
no auto-summary //
取消自动汇总
!
no ip http server
no ip http secure-server
!
!
!
logging alarm informational
!
!
control-plane
gatekeeper
shutdown
!
!
line con 0
exec-timeout 0 0
logging synchronous
stopbits 1
line aux 0
stopbits 1
line vty 0 4
!
!
end
1.3.2. R2配置
R2#sh run
!
version 12.4
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname R2
!
boot-start-marker
boot-end-marker
!
!
no aaa new-model
ip cef
no ip domain lookup
!
interface FastEthernet0/0
ip address 12.1.1.2 255.255.255.0
duplex auto
speed auto
!
!
interface FastEthernet2/0
ip address 23.1.1.2 255.255.255.0
duplex half
!
!
//EIGRP
配置
router eigrp 1
network 12.0.0.0
network 23.0.0.0
auto-summary
!
!
!
logging alarm informational
!
gatekeeper
shutdown
!
!
line con 0
logging synchronous
stopbits 1
line aux 0
stopbits 1
line vty 0 4
!
!
end
1.3.3. R3配置
R3#sh run
Building configuration...
Current configuration : 1128 bytes
!
version 12.4
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
hostname R3
!
boot-start-marker
boot-end-marker
!
!
no aaa new-model
ip cef
!
no ip domain lookup
!
interface Loopback0
ip address 3.1.1.1 255.255.255.0
!
interface Loopback1
ip address 3.1.2.1 255.255.255.0
!
interface Loopback2
ip address 3.1.3.1 255.255.255.0
!
!
interface FastEthernet2/0
ip address 23.1.1.3 255.255.255.0
duplex half
!
!
router eigrp 1
network 3.0.0.0
network 23.0.0.0
auto-summary
!
!
gatekeeper
shutdown
!
!
line con 0
exec-timeout 0 0
logging synchronous
stopbits 1
line aux 0
stopbits 1
line vty 0 4
!
!
End
1.4. 查看路由表
1.4.1.1. R1路由表
默认自动汇总
R1#sh ip route
1.0.0.0/8 is variably subnetted, 4 subnets, 2 masks
C 1.1.1.0/24 is directly connected, Loopback0
D 1.0.0.0/8 is a summary, 00:00:31, Null0 //
汇总路由指向
null0
C 1.1.2.0/24 is directly connected, Loopback1
C 1.1.3.0/24 is directly connected, Loopback2
D 3.0.0.0/8 [90/158720] via 12.1.1.2, 00:36:36, FastEthernet0/0
D 23.0.0.0/8 [90/30720] via 12.1.1.2, 00:36:36, FastEthernet0/0
12.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C 12.1.1.0/24 is directly connected, FastEthernet0/0
D 12.0.0.0/8 is a summary, 00:00:31, Null0//
汇总路由指向
null0
当仅仅自动汇总，路由表将显示明细路由，不像自动汇总和手动汇总会指向
NULL0
R1#sh ip route
Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external ty
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS
ia - IS-IS inter area, * - candidate default, U - per-user
o - ODR, P - periodic downloaded static route
Gateway of last resort is not set
1.0.0.0/24 is subnetted, 3 subnets
C 1.1.1.0 is directly connected, Loopback0
C 1.1.2.0 is directly connected, Loopback1
C 1.1.3.0 is directly connected, Loopback2
D 3.0.0.0/8 [90/158720] via 12.1.1.2, 02:17:49, FastEthernet0/
D 23.0.0.0/8 [90/30720] via 12.1.1.2, 02:17:49, FastEthernet0/
12.0.0.0/24 is subnetted, 1 subnets
C 12.1.1.0 is directly connected, FastEthernet0/0
关闭自动汇总且手动汇总
R1#sh ip route
Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route
Gateway of last resort is not set
1.0.0.0/8 is variably subnetted, 4 subnets, 2 masks
D 1.1.0.0/16 is a summary, 00:46:49, Null0 //
指向
NULL0
C 1.1.1.0/24 is directly connected, Loopback0
C 1.1.2.0/24 is directly connected, Loopback1
C 1.1.3.0/24 is directly connected, Loopback2
D 3.0.0.0/8 [90/158720] via 12.1.1.2, 00:32:42, FastEthernet0/0
D 23.0.0.0/8 [90/30720] via 12.1.1.2, 00:32:42, FastEthernet0/0
12.0.0.0/24 is subnetted, 1 subnets
C 12.1.1.0 is directly connected, FastEthernet0/0
如果没有关闭自动汇总直接进行手动汇总，我们可以发现两种汇总路由都存在于路由表
R1#sh ip route
Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route
Gateway of last resort is not set
1.0.0.0/8 is variably subnetted, 5 subnets, 3 masks
D 1.1.0.0/16 is a summary, 00:00:04, Null0//
指向
NULL0
C 1.1.1.0/24 is directly connected, Loopback0
D 1.0.0.0/8 is a summary, 00:03:19, Null0//
指向
NULL0
C 1.1.2.0/24 is directly connected, Loopback1
C 1.1.3.0/24 is directly connected, Loopback2
D 3.0.0.0/8 [90/158720] via 12.1.1.2, 00:39:23, FastEthernet0/0
D 23.0.0.0/8 [90/30720] via 12.1.1.2, 00:39:23, FastEthernet0/0
12.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C 12.1.1.0/24 is directly connected, FastEthernet0/0
D 12.0.0.0/8 is a summary, 00:03:19, Null0 //
指向
NULL0
1.4.1.2. R2路由表
在
EIGRP
中无论自动汇总还是手动汇总，汇总路由都会指向
Null0
，当路由时，找不到符合条件的明细路由，那么该数据包会丢向
null0
（垃圾桶），这样避免了默认路由等潜在的环路可能
。
R1自动汇总
R2#sh ip route
1.0.0.0/8 is subnetted, 1 subnets
D 1.0.0.0 [90/156160] via 12.1.1.1, 00:05:17, FastEthernet0/0
D 3.0.0.0/8 [90/156160] via 23.1.1.3, 01:02:07, FastEthernet2/0
23.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C 23.1.1.0/24 is directly connected, FastEthernet2/0
D 23.0.0.0/8 is a summary, 01:03:45, Null0//
指向
NULL0
12.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C 12.1.1.0/24 is directly connected, FastEthernet0/0
D 12.0.0.0/8 is a summary, 01:03:45, Null0//
指向
NULL0
R1关闭自动汇总且手动汇总
R2#sh ip route
1.0.0.0/16 is subnetted, 1 subnets
D 1.1.0.0 [90/156160] via 12.1.1.1, 00:00:05, FastEthernet0/0 //
汇总成
16
位
D 3.0.0.0/8 [90/156160] via 23.1.1.3, 00:00:45, FastEthernet2/0
23.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C 23.1.1.0/24 is directly connected, FastEthernet2/0
D 23.0.0.0/8 is a summary, 00:00:45, Null0//
指向
NULL0
12.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C 12.1.1.0/24 is directly connected, FastEthernet0/0
D 12.0.0.0/8 is a summary, 00:00:45, Null0//
指向
NULL0
不关闭自动汇总情况下手动汇总
R2#sh ip route
Codes: C - connected, S - static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2
i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
ia - IS-IS inter area, * - candidate default, U - per-user static route
o - ODR, P - periodic downloaded static route
Gateway of last resort is not set
1.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
D 1.1.0.0/16 [90/156160] via 12.1.1.1, 00:05:14, FastEthernet0/0
D 1.0.0.0/8 [90/156160] via 12.1.1.1, 00:00:09, FastEthernet0/0
D 3.0.0.0/8 [90/156160] via 23.1.1.3, 00:05:55, FastEthernet2/0
23.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C 23.1.1.0/24 is directly connected, FastEthernet2/0
D 23.0.0.0/8 is a summary, 00:05:55, Null0//
指向
NULL0
12.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
C 12.1.1.0/24 is directly connected, FastEthernet0/0
D 12.0.0.0/8 is a summary, 00:05:55, Null0//
指向
NULL0