EIGRP-LAB

实验目的：

了解并掌握EIGRP的配置方法及特性。用EIGRP动态路由协议实现全网的互通。

实验拓扑：

基础配置：

R1
hostname R1
！
interface FastEthernet0/0
ip address 12.1.1.1 255.255.255.0
no shutdown
！
interface FastEthernet0/1
ip address 1.1.1.254 255.255.255.0
no shutdown

R2
hostname R2
！
interface FastEthernet0/0
 ip address 12.1.1.2 255.255.255.0
 no shutdown
！
interface FastEthernet0/1
 ip address 23.1.1.2 255.255.255.0
 no shutdown
！
interface FastEthernet1/0
 ip address 2.2.2.254 255.255.255.0
 no shutdown

R3
hostname R3
！
interface FastEthernet0/0
 ip address 23.1.1.3 255.255.255.0
 no shutdown
！
interface FastEthernet0/1
 ip address 3.3.3.254 255.255.255.0
 no shutdown

 实验步骤：

R1
router eigrp 90 #EIGRP 的AS号为90，在同一路由域内，此 AS 号必需相同
 network 12.0.0.0 #以主类宣告的方法通告对应的网络号
 network 1.0.0.0 
 no auto-summary #关闭自动汇总

R2
router eigrp 90
 network 12.0.0.0
 network 23.0.0.0
 network 2.0.0.0
 no auto-summary

R3
router eigrp 90
 network 23.0.0.0
 network 3.0.0.0
 no auto-summary

结果验证：

R2
show ip eigrp neighbors #在R2上查看与R1和R3的邻居表
IP-EIGRP neighbors for process 90
H   Address         Interface      Hold Uptime    SRTT   RTO   Q   Seq
                                   (sec)          (ms)        Cnt  Num
0   12.1.1.1        Fa0/0          11   00:17:11  40     1000  0   7
1   23.1.1.3        Fa0/1          12   00:17:11  40     1000  0   7

H:队列 0-先建立邻居的路由条目。
Hold=3*hello时间(hello大于等于T1链路上每5秒发送一次，小于等于T1 链路上60S发送一次。）=15s&180s：用来判断15s&180s内两路由器有没有收到hello包邻居就会down。
Uptime：和邻居建立的时间。
SRTT（smooth Round-Trip timer)：平滑的往返时间（ms)。本地给邻居发送一个可靠报文，收到回应的ACK报文的时间。（越小越好）。
RTO（retransmission timeout)：重传超时时间（ms)。本地给邻居发送一个可靠报文，没有收到ACK面进行重传该报文的等待时间。6*SRTT=RTO。16次后重置邻居。

R2
show ip eigrp topology  #在R2上查看拓扑表
IP-EIGRP Topology Table for AS 90/ID(23.1.1.2)

Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,
       r - Reply status

P 1.1.1.0/24, 1 successors, FD is 30720
         via 12.1.1.1 (30720/28160), FastEthernet0/0
P 2.2.2.0/24, 1 successors, FD is 28160
         via Connected, FastEthernet1/0
P 3.3.3.0/24, 1 successors, FD is 30720
         via 23.1.1.3 (30720/28160), FastEthernet0/1
P 12.1.1.0/24, 1 successors, FD is 28160
         via Connected, FastEthernet0/0
P 23.1.1.0/24, 1 successors, FD is 28160
         via Connected, FastEthernet0/1

R2
show ip route  #在R2上查看路由表
Codes: C - connected, S - static, I - IGRP, 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, E - EGP
       i - IS-IS, 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

     1.0.0.0/24 is subnetted, 1 subnets
D       1.1.1.0 [90/30720] via 12.1.1.1, 00:38:16, FastEthernet0/0
     2.0.0.0/24 is subnetted, 1 subnets
C       2.2.2.0 is directly connected, FastEthernet1/0
     3.0.0.0/24 is subnetted, 1 subnets
D       3.3.3.0 [90/30720] via 23.1.1.3, 00:38:16, FastEthernet0/1
     12.0.0.0/24 is subnetted, 1 subnets
C       12.1.1.0 is directly connected, FastEthernet0/0
     23.0.0.0/24 is subnetted, 1 subnets
C       23.1.1.0 is directly connected, FastEthernet0/1