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 1.rip全网可达

[r1]rip 1
[r1-rip-1]version 2
[r1-rip-1]network 12.0.0.0
[r1-rip-1]network 1.0.0.0
[r1-rip-1]ping 4.4.4.4 
  PING 4.4.4.4: 56  data bytes, press CTRL_C to break
    Request time out
    Request time out
    Reply from 4.4.4.4: bytes=56 Sequence=3 ttl=253 time=50 ms
    Reply from 4.4.4.4: bytes=56 Sequence=4 ttl=253 time=30 ms
    Reply from 4.4.4.4: bytes=56 Sequence=5 ttl=253 time=20 ms

  --- 4.4.4.4 ping statistics ---
    5 packet(s) transmitted
    3 packet(s) received
    40.00% packet loss
    round-trip min/avg/max = 20/33/50 ms

[r1-rip-1]

2.明文加密

[r1]int g0/0/0
[r1-GigabitEthernet0/0/0]rip authentication-mode simple cipher 123
[r1-GigabitEthernet0/0/0]

[r2]int g0/0/0
[r2-GigabitEthernet0/0/0]rip authentication-mode simple cipher 123
[r2-GigabitEthernet0/0/0]

3.密文加密

[r2-GigabitEthernet0/0/0]int g0/0/1	
[r2-GigabitEthernet0/0/1]rip authentication-mode md5 usual  cipher 123
[r2-GigabitEthernet0/0/1]

[r3]int g0/0/0	
[r3-GigabitEthernet0/0/0]rip authentication-mode md5 usual cipher 123
[r3-GigabitEthernet0/0/0]

3.环回汇总

[r3-GigabitEthernet0/0/0]rip summary-address 192.168.0.0 255.255.252.0
[r3-GigabitEthernet0/0/0]quit
[r3]int g0/0/1
[r3-GigabitEthernet0/0/1]rip summary-address 192.168.0.0 255.255.252.0
[r3-GigabitEthernet0/0/1]

问题：那个r1的环回不知道怎么undo