要求分析：
1.R3自带环路，R1和R2需要配置两个环路，骨干链路自己设计 ，区域为192.168.1.0/24
2.使用RIPv2，且不能直接宣告R3环路
3.全网可达，数据安全（设置密文），汇总路由
解：
首先是网络地址的分析，需要2+1个网段2^n-2>3 --- n为3，借三位
192.168.1.0/24+3
192.168.1.0/27 ---骨干链路
192.168.1.0/30 --- R1和R2之间的地址段
192.168.1.4/30 ---R2和R3之间的地址段
192.168.1.32/27 ---R1环回
192.168.1.33/28 ---R1的环回1
192.168.1.49/28 ---R1的环回2
192.168.1.64/27 ---R2环回
192.168.1.65/28 ---R2的环回1
192.168.1.81/28 ---R2的环回2
此时地址已经分配完毕。
然后开始设置汇总:
R1 的汇总可以设置为192.168.1.32/27
R2 的汇总可以设置为192.168.1.64/27
这个时候不要忘记设置空接口，防止黑洞
然后就密文设置，我在R1和R2之间设置一个123456，R2和R3之间设置654321。
解题：
基础配置
//R1
<Huawei>SYS
Enter system view, return user view with Ctrl+Z.
[Huawei]SYS R1
[R1]inte
[R1]interface g0/0/0
[R1-GigabitEthernet0/0/0]ip a
[R1-GigabitEthernet0/0/0]ip accounting
[R1-GigabitEthernet0/0/0]ip address 192.168.1.1 30
Nov 16 2021 23:04:59-08:00 R1 %%01IFNET/4/LINK_STATE(l)[0]:The line protocol IP
on the interface GigabitEthernet0/0/0 has entered the UP state.
[R1-GigabitEthernet0/0/0]int l0
[R1-LoopBack0]ip a
[R1-LoopBack0]ip address 192.168.1.33 28
[R1-LoopBack0]int l1
[R1-LoopBack1]ip ad
[R1-LoopBack1]ip address 192.168.1.49 28
//配置null0空接口，防汇总环路
[R1]ip route-static 192.168.1.32 27 null 0
//R2
[R2]int
[R2]interface g0/0/0
[R2-GigabitEthernet0/0/0]ip ad
[R2-GigabitEthernet0/0/0]ip address 192.168.1.2 30
Nov 16 2021 23:05:52-08:00 R2 %%01IFNET/4/LINK_STATE(l)[0]:The line protocol IP
on the interface GigabitEthernet0/0/0 has entered the UP state.
[R2-GigabitEthernet0/0/0]interface g0/0/1
[R2-GigabitEthernet0/0/1]ip address 192.168.1.5 30
Nov 16 2021 23:06:06-08:00 R2 %%01IFNET/4/LINK_STATE(l)[1]:The line protocol IP
on the interface GigabitEthernet0/0/1 has entered the UP state.
[R2-GigabitEthernet0/0/1]int l0
[R2-LoopBack0]ip ad
[R2-LoopBack0]ip address 192.168.1.65 28
[R2-LoopBack0]int l1
[R2-LoopBack1]ip address 192.168.1.81 28
[R2-LoopBack1]q
//R2的空接口配置
[R2]ip route-static 192.168.1.64 27 null0
//R3
[R3]int
[R3]interface g0/0/0
[R3-GigabitEthernet0/0/0]ip ad
[R3-GigabitEthernet0/0/0]ip address 192.168.1.6 30
Nov 16 2021 23:06:57-08:00 R3 %%01IFNET/4/LINK_STATE(l)[0]:The line protocol IP
on the interface GigabitEthernet0/0/0 has entered the UP state.
[R3-GigabitEthernet0/0/0]int l0
[R3-LoopBack0]ip ad
[R3-LoopBack0]ip address 3.3.3.0 24
Error: The specified IP address is invalid.
[R3-LoopBack0]ip address 3.3.3.1 24
[R3-LoopBack0]q
//R3自带环回接口，所以不配置null0配置RIP
//R1
[R1]rip
[R1-rip-1]ver
[R1-rip-1]verify-source
[R1-rip-1]version 2
[R1-rip-1]net
[R1-rip-1]network 192.168.1.0
//R2
[R2]rip
[R2-rip-1]ver
[R2-rip-1]verify-source
[R2-rip-1]version 2
[R2-rip-1]network 192.168.1.0
//R3
[R3]rip
[R3-rip-1]ver
[R3-rip-1]verify-source
[R3-rip-1]version 2
[R3-rip-1]net
[R3-rip-1]network 192.168.1.0RIP汇总
//R1汇总
[R1]int
[R1]interface g0/0/0
[R1-GigabitEthernet0/0/0]rip s
[R1-GigabitEthernet0/0/0]rip split-horizon
[R1-GigabitEthernet0/0/0]rip summary-address 192.168.1.32 255.255.255.224
//R2汇总
[R2]interface g0/0/0
[R2-GigabitEthernet0/0/0]rip summary-address 192.168.1.64 255.255.255.224
[R2-GigabitEthernet0/0/0]int g0/0/1
[R2-GigabitEthernet0/0/1]rip summary-address 192.168.1.64 255.255.255.224
//R3只有一个环回不需要汇总，此时分别查看R1,R2,R3的RIP条目
//R1
<R1>display rip 1 route
Route Flags : R - RIP
A - Aging, G - Garbage-collect
----------------------------------------------------------------------------
Peer 192.168.1.2 on GigabitEthernet0/0/0
Destination/Mask Nexthop Cost Tag Flags Sec
192.168.1.4/30 192.168.1.2 1 0 RA 22
192.168.1.64/27 192.168.1.2 1 0 RA 22
//R2
[R2]display rip 1 route
Route Flags : R - RIP
A - Aging, G - Garbage-collect
----------------------------------------------------------------------------
Peer 192.168.1.1 on GigabitEthernet0/0/0
Destination/Mask Nexthop Cost Tag Flags Sec
192.168.1.32/27 192.168.1.1 1 0 RA 25
//R3
<R3>display rip 1 route
Route Flags : R - RIP
A - Aging, G - Garbage-collect
----------------------------------------------------------------------------
Peer 192.168.1.5 on GigabitEthernet0/0/0
Destination/Mask Nexthop Cost Tag Flags Sec
192.168.1.5/30 192.168.1.5 1 0 RA 13
192.168.1.32/27 192.168.1.5 2 0 RA 13
192.168.1.64/27 192.168.1.5 1 0 RA 13
！！！为了安全起见，我在R1和R2之间设置密文登录，密文为123456
而R2和R3之间设置密文的密码为654321
//R1
[R1]rip
[R1-rip-1]ver
[R1-rip-1]verify-source
[R1-rip-1]version 2
[R1-rip-1]int
[R1-rip-1]int g0/0/0
[R1-GigabitEthernet0/0/0]rip au
[R1-GigabitEthernet0/0/0]rip authentication-mode ?
hmac-sha256
md5 MD5 authentication
simple Simple authentication
[R1-GigabitEthernet0/0/0]rip authentication-mode md5 ?
nonstandard Nonstandard MD5 authentication packet format (IETF)
usual Huawei MD5 authentication packet format
[R1-GigabitEthernet0/0/0]rip authentication-mode md5 u
[R1-GigabitEthernet0/0/0]rip authentication-mode md5 usual c
[R1-GigabitEthernet0/0/0]rip authentication-mode md5 usual cipher 123456
[R1-GigabitEthernet0/0/0]q
//R2
[R2]rip
[R2-rip-1] ver
[R2-rip-1]version 2
[R2-rip-1]int
[R2-rip-1]int
[R2-rip-1]int g0/0/1
[R2-GigabitEthernet0/0/1]rip a
[R2-GigabitEthernet0/0/1]rip authentication-mode md5 us
[R2-GigabitEthernet0/0/1]rip authentication-mode md5 usual c
[R2-GigabitEthernet0/0/1]rip authentication-mode md5 usual cipher 654321
[R2]int g0/0/0
[R2-GigabitEthernet0/0/0]rip a
[R2-GigabitEthernet0/0/0]rip authentication-mode md5 us
[R2-GigabitEthernet0/0/0]rip authentication-mode md5 usual c
[R2-GigabitEthernet0/0/0]rip authentication-mode md5 usual cipher 123456
[R2-GigabitEthernet0/0/0]q
//R3
[R3]rip
[R3-rip-1]ver
[R3-rip-1]verify-source
[R3-rip-1]version 2
[R3-rip-1]int
[R3-rip-1]int g0/0/0
[R3-GigabitEthernet0/0/0]rip
[R3-GigabitEthernet0/0/0]rip a
[R3-GigabitEthernet0/0/0]rip authentication-mode md5 u
[R3-GigabitEthernet0/0/0]rip authentication-mode md5 usual c
[R3-GigabitEthernet0/0/0]rip authentication-mode md5 usual cipher 654321
//再次查看rip表格，R2从之前的无效时间，重新变成周期时间
[R2]display rip 1 route
Route Flags : R - RIP
A - Aging, G - Garbage-collect
----------------------------------------------------------------------------
Peer 192.168.1.1 on GigabitEthernet0/0/0
Destination/Mask Nexthop Cost Tag Flags Sec
192.168.1.32/27 192.168.1.1 16 0 RG 104
[R2]display rip 1 route
Route Flags : R - RIP
A - Aging, G - Garbage-collect
----------------------------------------------------------------------------
Peer 192.168.1.1 on GigabitEthernet0/0/0
Destination/Mask Nexthop Cost Tag Flags Sec
192.168.1.32/27 192.168.1.1 1 0 RA 3
此时R1和R3之间互相ping通
//R1
<R1>ping 192.168.1.6
PING 192.168.1.6: 56 data bytes, press CTRL_C to break
Reply from 192.168.1.6: bytes=56 Sequence=1 ttl=254 time=70 ms
Reply from 192.168.1.6: bytes=56 Sequence=2 ttl=254 time=10 ms
Reply from 192.168.1.6: bytes=56 Sequence=3 ttl=254 time=30 ms
Reply from 192.168.1.6: bytes=56 Sequence=4 ttl=254 time=20 ms
Reply from 192.168.1.6: bytes=56 Sequence=5 ttl=254 time=30 ms
--- 192.168.1.6 ping statistics ---
5 packet(s) transmitted
5 packet(s) received
0.00% packet loss
round-trip min/avg/max = 10/32/70 ms
//R3
<R3>ping 192.168.1.1
PING 192.168.1.1: 56 data bytes, press CTRL_C to break
Reply from 192.168.1.1: bytes=56 Sequence=1 ttl=254 time=40 ms
Reply from 192.168.1.1: bytes=56 Sequence=2 ttl=254 time=30 ms
Reply from 192.168.1.1: bytes=56 Sequence=3 ttl=254 time=20 ms
Reply from 192.168.1.1: bytes=56 Sequence=4 ttl=254 time=20 ms
Reply from 192.168.1.1: bytes=56 Sequence=5 ttl=254 time=30 ms
--- 192.168.1.1 ping statistics ---
5 packet(s) transmitted
5 packet(s) received
0.00% packet loss
round-trip min/avg/max = 20/28/40 ms完成！！！