EIGRP中在T1（1.54Mbps）链路中的hello时间间隔默认为60秒
大于T1链路时hello的时间间隔默认为5秒
修改间隔的命令为：
interface s0/0
ip hello-interval eigrp 1 2 其中1为自治域系统号，2为hello时间间隔
ip hold-time eigrp 1 6，其中1为自治域系统号，6为保持计时器时间
查看修改后的配置
R1#show ip eigrp interfaces detail
IP-EIGRP interfaces for process 1
Xmit Queue Mean Pacing Time Multicast Pending
Interface Peers Un/Reliable SRTT Un/Reliable Flow Timer Routes
Se0/0 1 0/0 205 0/15 927 0
Hello interval is 1 sec
Next xmit serial <none>
Un/reliable mcasts: 0/0 Un/reliable ucasts: 2/10
Mcast exceptions: 0 CR packets: 0 ACKs suppressed: 4
Retransmissions sent: 2 Out-of-sequence rcvd: 0
Authentication mode is not set
Use unicast
实验配置
按照上图配置好借口地址与EIGRP
1.0.0.1 --> 2.0.0.2 是通过fram-relay网络传输，
我们可以做如下测试将R2的s0/0接口手动shutdown后，1.0.0.1 --> 2.0.0.2 多长时间能通
测试方法
R1#ping 2.0.0.2 source loopback 0 repeat 1000 timeout 1
Type escape sequence to abort.
Sending 1000, 100-byte ICMP Echos to 2.0.0.2, timeout is 1 seconds:
Packet sent with a source address of 1.0.0.1
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!!!!!!!!!!!!!!...!!!!!!!!!!!!!!!!
要求：如果要求在R2的s0/0接口shutdown后5秒内 1.0.0.1 -->2.0.0.2 能够ping通
修改方法：在R1和R2的s0/0接口上做如下配置即可
interface s0/0
ip hello-interval eigrp 1 1
ip hold-time eigrp 1 3
其中前面的1为EIGRP的自治域系统号
