按所说要求搭建一个新的拓扑图！
AR1-AR6为路由器3260
1、R6为isp，接口IP地址均为公有地址，该设备只能配置ip地址，之后不能再对其进行其它任何配置；
2、R1-R5为局域网，私有地址IP192.168.1.0/24，请合理分配；
3、R1,R2,R3，各有两个环回地址；R5,R6各有一个换回地址；所有路由器上环回地址均代表连接用户的接口；
4、R3下的两台PC通过DHCP自动获取IP地址；
5、选路最佳，路由表尽量小，避免环路；
6、R1-R5均可以访问R6的环回；
7、R6telnetR5的公有IP时，实际登录到R1上；
8R4与R5正常通过1000M链路，故障时通过100M链路；
网络规划思路：
环回： R1环回： [r1]interface LoopBack 0 [r1-LoopBack0]ip address 192.168.1.33 28 [r1-LoopBack0]int lo1 [r1-LoopBack1]ip address 192.168.1.49 28 R2环回： [r2]interface LoopBack 0 [r2-LoopBack0]ip address 192.168.1.65 28 [r2-LoopBack0]int lo1 [r2-LoopBack1]ip address 192.168.1.81 28 R4环回： [r4]interface LoopBack 0 [r4-LoopBack0]ip address 192.168.1.129 28 [r4-LoopBack0]interface LoopBack 1 [r4-LoopBack1]ip address 192.168.1.145 28 R5环回： [r5]interface LoopBack 0 [r5-LoopBack0]ip address 192.168.1.161 27 R6： [r6]interface LoopBack 0 [r6-LoopBack0]ip address 6.6.6.6 24
R1 192.168.1.32/27
(192.168.1.32/28 192.168.1.48/28)
R2 192.168.1.64/27
( 192.168.1.64/28 192.168.1.80/28)
R3 192.168.1.96/27
R4 192.168.1.128/27
( 192.168.1.128/28 192.168.1.144/28)
R5 192.168.1.160/27
R1: [R1-GigabitEthernet0/0/0]ip address 192.168.1.1 30 [R1-GigabitEthernet0/0/0]int g0/0/1 [R1-GigabitEthernet0/0/1]ip address 192.168.1.14 30
R2: [R2]interface g0/0/0 [R2-GigabitEthernet0/0/0]ip address 192.168.1.2 30 [R2-GigabitEthernet0/0/0]interface g0/0/1 [R2-GigabitEthernet0/0/1]ip address 192.168.1.5 30
R3: [R3]interface g0/0/0 [R3-GigabitEthernet0/0/0]ip address 192.168.1.13 30 [R3-GigabitEthernet0/0/0]interface g0/0/1 [R3-GigabitEthernet0/0/1]ip address 192.168.1.10 30
R4: [R4]interface g0/0/0 [R4-GigabitEthernet0/0/0]ip address 192.168.1.6 30 [R4-GigabitEthernet0/0/0]interface g0/0/1 [R4-GigabitEthernet0/0/1]ip address 192.168.1.9 30 [R4]interface g4/0/0 [R4-GigabitEthernet4/0/0]ip address 192.168.1.17 30 [R4-GigabitEthernet4/0/0]interface g0/0/2 [R4-GigabitEthernet0/0/2]ip address 192.168.1.21 30
