CCNP-1 EIGRP基本配置(BSCI)
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CCNP1-EIGRP基本配置实验拓扑：  实验要求：1-R1与R2起EIGRP；
2-在R1上起Loopback，配置连续IP，观察EIGRP自动汇总，然后取消自动汇总，配置手动汇总，观察与自动汇总的区别；
3-在R2上配置到R3上的静态路由，并使用缺省路由通告给R1，观察R1与R2的路由表变化；
试验目的：掌握EIGRP的基本配置。
试验配置：
R1：
R1(config)#int s1/0
R1(config-if)#ip add
R1(config-if)#no shu
R1(config-if)#exit
R1(config)#int loop0
R1(config-if)#ip add 199.99.1.1 255.255.255.0
R1(config-if)#exit
R1(config)#router eigrp 100
R1(config-router)#net
R1(config-router)#net 199.99.1.0
R2：
R2(config)#int s1/0
R2(config-if)#ip add
R2(config-if)#clock rate 64000
R2(config-if)#no shu
R2(config-if)#exit
R2(config)#int s1/1
R2(config-if)#ip add 172.16.0.2 255.255.255.0
R2(config-if)#clock rate 64000
R2(config-if)#no shu
R2(config-if)#exit
R2(config)#router eigrp 100
R2(config-router)#net
R2(config-router)#net 172.16.0.0
在R1与R2上show ip route察看路由表：
R1#show ip route
Codes: C - connected, S - static, R - RIP, M - mobile, B
- BGP
D - EIGRP,
EX - EIGRP external, O -
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
D 172.16.0.0/16
[90/2681856] vi
C 199.99.1.0/24
is directly connected, Loopback0
C
D
R2#show ip route
Codes: C - connected, S - static, R - RIP, M - mobile, B
- BGP
D - EIGRP,
EX - EIGRP external, O -
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
172.16.0.0/16
is variably subnetted, 2 subnets, 2 masks
C
172.16.0.0/24 is directly connected, Serial1/1
D
172.16.0.0/16 is a summary, 00:00:03, Null0
D 199.99.1.0/24
[90/2297856] vi
C
D
可以看到收到了EIGRP的路由，OK，下面我们来比较自动汇总和手动汇总的区别：在R1上起Loopback接口测试：
R1(config)#int loop1
R1(config-if)#ip add
144.44.0.1 255.255.255.0
R1(config-if)#int loop2
R1(config-if)#ip add
144.44.1.1 255.255.255.0
R1(config-if)#int loop3
R1(config-if)#ip add
144.44.2.1 255.255.255.0
R1(config-if)#int loop4
R1(config-if)#ip add
144.44.3.1 255.255.255.0
R1(config-if)#exit
R1(config)#router eigrp
100
R1(config-router)#network
144.44.0.0
R1(config-router)#network
144.44.1.0
R1(config-router)#network
144.44.2.0
R1(config-router)#network
144.44.3.0
好，然后我们在R2上show ip route查看路由表：
R2#show ip route
Codes: C - connected, S
- static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O -
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
172.16.0.0/16 is variably subnetted, 2
subnets, 2 masks
C 172.16.0.0/24 is directly connected,
Serial1/1
D 172.16.0.0/16 is a summary, 00:00:40,
Null0
D 144.44.0.0/16 [90/2297856] vi
D 199.99.1.0/24 [90/2297856] vi
C
D
EIGRP自动汇总功能把144的路由自动汇总成一个B类网络，下面我们取消自动汇总：
R1(config-router)#no
auto-summary
到R2上察看路由表，观察有什么变化？
R2#show ip route
Codes: C - connected, S
- static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O -
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
172.16.0.0/16 is variably subnetted, 2
subnets, 2 masks
C 172.16.0.0/24 is directly connected,
Serial1/1
D 172.16.0.0/16 is a summary, 00:00:43,
Null0
144.44.0.0/24 is subnetted, 4 subnets
D 144.44.0.0 [90/2297856] vi
D 144.44.1.0 [90/2297856] vi
D 144.44.2.0 [90/2297856] vi
D 144.44.3.0 [90/2297856] vi
D 199.99.1.0/24 [90/2297856] vi
C
D
路由表中列出了4条到144网络的路由，下面再配置手动汇总，观察区别。
R1(config)#int s1/0
R1(config-if)#ip
summary-address eigrp 100 144.44.0.0 255.255.252.0
再到R2上察看路由表，观察有什么变化？
R2#show ip route
Codes: C - connected, S
- static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O -
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
172.16.0.0/16 is variably subnetted, 2
subnets, 2 masks
C 172.16.0.0/24 is directly connected,
Serial1/1
D 172.16.0.0/16 is a summary, 00:00:50,
Null0
144.44.0.0/22 is subnetted, 1 subnets
D 144.44.0.0 [90/2297856] vi
D 199.99.1.0/24 [90/2297856] vi
C
D
通告的掩码由原来自动汇总的16位，到没有汇总的24位，现在又到手动配置汇总的22位。这样可以大大减小路由标的大小，又可以配置一些不连续子网的汇聚（建议设计网络的时候都设计成连续的子网）。
路由器R3的配置如下：
R3(config)#int s1/0
R3(config-if)#ip add
172.16.0.1 255.255.255.0
R3(config-if)#no shu
R3(config-if)#exit
R3(config)#int loop0
R3(config-if)#ip add 172.16.1.1
255.255.255.0
R3(config-if)#int loop1
R3(config-if)#ip add
172.16.2.1 255.255.255.0
R3(config-if)#int loop2
R3(config-if)#ip add
172.16.3.1 255.255.255.0
R3(config-if)#exit
R3(config)#ip route
然后在R2上添加下面的两条命令：
R2(config)#ip
default-network 172.16.0.0
R2(config)#ip route
172.16.0.0 255.255.0.0 172.16.0.1
然后在R2上show ip route察看路由表：
R2#show ip route
Codes: C - connected, S
- static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O -
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
172.16.0.1 to network 172.16.0.0
*
172.16.0.0/16 is variably subnetted, 2 subnets, 2 masks
C 172.16.0.0/24 is directly connected, Serial1/1
S* 172.16.0.0/16 [1/0] via 172.16.0.1
144.44.0.0/22 is subnetted, 1 subnets
D 144.44.0.0 [90/2297856] vi
D 199.99.1.0/24 [90/2297856] vi
C
D
再到R1上察看一下路由表：
R1#show ip route
Codes: C - connected, S
- static, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O -
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
D* 172.16.0.0/16 [90/2681856] vi
144.44.0.0/16 is variably subnetted, 5
subnets, 2 masks
C 144.44.0.0/24 is directly connected,
Loopback1
D 144.44.0.0/22 is a summary, 00:01:07,
Null0
C 144.44.1.0/24 is directly connected,
Loopback2
C 144.44.2.0/24 is directly connected,
Loopback3
C 144.44.3.0/24 is directly connected,
Loopback4
C 199.99.1.0/24 is directly connected,
Loopback0
C
看到了有个D*路由，说明R1通过R2学到一条到172.16.0.0/16的缺省路由，这样配置一般都是在EIGRP自治系统边界路由器上配置，为了向自治系统内通告一条缺省到自治系统外的路由。下面进行ping验证：
R1#ping 172.16.0.1
Type escape sequence to
abort.
Sending 5, 100-byte
ICMP Echos to 172.16.0.1, timeout is 2 seconds:
!!!!!
Success rate is 100
percent (5/5), round-trip min/avg/max = 168/201/264 ms
R1#ping 172.16.1.1
Type escape sequence to
abort.
Sending 5, 100-byte
ICMP Echos to 172.16.1.1, timeout is 2 seconds:
!!!!!
Success rate is 100
percent (5/5), round-trip min/avg/max = 168/239/288 ms
R1#
R1#ping 172.16.2.1
Type escape sequence to
abort.
Sending 5, 100-byte
ICMP Echos to 172.16.2.1, timeout is 2 seconds:
!!!!!
Success rate is 100
percent (5/5), round-trip min/avg/max = 144/224/288 ms
都通了。
总结：通过实验掌握EIGRP基本配置，以及EIGRP自动汇聚与手动汇聚的区别，默认为自动汇聚，还掌握了ip default-network命令的用法和配置方法。 本文出自 “★Beckham~23” 博客，请务必保留此出处http://loveme23.blog.51cto.com/7891/45310 本文出自 51CTO.COM技术博客 |
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