Ход работы
Запретим пересылку маршрутов между A,B и C,D
Используем простые списки доступа
RouterA#config t
RouterA(config)#access-list 1 deny 138.1.3.0 0.0.0.255
RouterA(config)#access-list 1 deny 138.1.4.0 0.0.0.255
RouterA(config)#access-list 1 permit any
RouterA(config)#interface s0
RouterA(config-if)#ip access-group 1 in
RouterB#config t
RouterB(config)#access-list 1 deny 138.1.3.0 0.0.0.255
RouterB(config)#access-list 1 deny 138.1.4.0 0.0.0.255
RouterB(config)#access-list 1 permit any
RouterB(config)#interface s0
RouterB(config-if)#ip access-group 1 in
RouterC#config t
RouterC(config)#access-list 1 deny 138.1.1.0 0.0.0.255
RouterC(config)#access-list 1 deny 138.1.2.0 0.0.0.255
RouterC(config)#access-list 1 permit any
RouterC(config)#interface s1
RouterC(config-if)#ip access-group 1 in
RouterE#config t
RouterE(config)#access-list 1 deny 138.1.1.0 0.0.0.255
RouterE(config)#access-list 1 deny 138.1.2.0 0.0.0.255
RouterE(config)#access-list 1 permit any
RouterE(config)#interface s0
RouterE(config-if)#ip access-group 1 in
Проверим работу списков доступа командами ping на рабочих станциях PC1-4 в рабочие станции PC1-4.
PC1:
C:>ping 138.1.2.2
Pinging 138.1.2.2 with 32 bytes of data:
Reply from 138.1.2.2: bytes=32 time=60ms TTL=241
Reply from 138.1.2.2: bytes=32 time=60ms TTL=241
Reply from 138.1.2.2: bytes=32 time=60ms TTL=241
Reply from 138.1.2.2: bytes=32 time=60ms TTL=241
Reply from 138.1.2.2: bytes=32 time=60ms TTL=241
Ping statistics for 138.1.2.2: Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 50ms, Maximum = 60ms, Average = 55ms
C:>ping 138.1.3.2
Pinging 138.1.3.2 with 32 bytes of data:
Request timed out.
Request timed out.
Request timed out.
Request timed out.
Request timed out.
Ping statistics for 138.1.3.2:
Packets: Sent = 4, Received = 0, Lost = 4 (100% loss),
Approximate round trip times in milli-seconds:
Minimum = 0ms, Maximum = 0ms, Average = 0ms
C:>ping 138.1.4.2
Pinging 138.1.4.2 with 32 bytes of data:
Request timed out.
Request timed out.
Request timed out.
Request timed out.
Request timed out.
Ping statistics for 138.1.4.2:
Packets: Sent = 4, Received = 0, Lost = 4 (100% loss),
Approximate round trip times in milli-seconds:
Minimum = 0ms, Maximum = 0ms, Average = 0ms
PC2:
C:>ping 138.1.1.2
Pinging 138.1.1.2 with 32 bytes of data:
Reply from 138.1.1.2: bytes=32 time=60ms TTL=241
Reply from 138.1.1.2: bytes=32 time=60ms TTL=241
Reply from 138.1.1.2: bytes=32 time=60ms TTL=241
Reply from 138.1.1.2: bytes=32 time=60ms TTL=241
Reply from 138.1.1.2: bytes=32 time=60ms TTL=241
Ping statistics for 138.1.1.2: Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 50ms, Maximum = 60ms, Average = 55ms
C:>ping 138.1.3.2
Pinging 138.1.3.2 with 32 bytes of data:
Request timed out.
Request timed out.
Request timed out.
Request timed out.
Request timed out.
Ping statistics for 138.1.3.2:
Packets: Sent = 4, Received = 0, Lost = 4 (100% loss),
Approximate round trip times in milli-seconds:
Minimum = 0ms, Maximum = 0ms, Average = 0ms
C:>ping 138.1.4.2
Pinging 138.1.4.2 with 32 bytes of data:
Request timed out.
Request timed out.
Request timed out.
Request timed out.
Request timed out.
Ping statistics for 138.1.4.2:
Packets: Sent = 4, Received = 0, Lost = 4 (100% loss),
Approximate round trip times in milli-seconds:
Minimum = 0ms, Maximum = 0ms, Average = 0ms
PC3:
C:>ping 138.1.1.2
Pinging 138.1.1.2 with 32 bytes of data:
Request timed out.
Request timed out.
Request timed out.
Request timed out.
Request timed out.
Ping statistics for 138.1.1.2:
Packets: Sent = 4, Received = 0, Lost = 4 (100% loss),
Approximate round trip times in milli-seconds:
Minimum = 0ms, Maximum = 0ms, Average = 0ms
C:>ping 138.1.2.2
Pinging 138.1.2.2 with 32 bytes of data:
Request timed out.
Request timed out.
Request timed out.
Request timed out.
Request timed out.
Ping statistics for 138.1.2.2:
Packets: Sent = 4, Received = 0, Lost = 4 (100% loss),
Approximate round trip times in milli-seconds:
Minimum = 0ms, Maximum = 0ms, Average = 0ms
C:>ping 138.1.4.2
Pinging 138.1.4.2 with 32 bytes of data:
Reply from 138.1.4.2: bytes=32 time=60ms TTL=241
Reply from 138.1.4.2: bytes=32 time=60ms TTL=241
Reply from 138.1.4.2: bytes=32 time=60ms TTL=241
Reply from 138.1.4.2: bytes=32 time=60ms TTL=241
Reply from 138.1.4.2: bytes=32 time=60ms TTL=241
Ping statistics for 138.1.4.2: Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 50ms, Maximum = 60ms, Average = 55ms
PC4:
C:>ping 138.1.1.2
Pinging 138.1.1.2 with 32 bytes of data:
Request timed out.
Request timed out.
Request timed out.
Request timed out.
Request timed out.
Ping statistics for 138.1.1.2:
Packets: Sent = 4, Received = 0, Lost = 4 (100% loss),
Approximate round trip times in milli-seconds:
Minimum = 0ms, Maximum = 0ms, Average = 0ms
C:>ping 138.1.2.2
Pinging 138.1.2.2 with 32 bytes of data:
Request timed out.
Request timed out.
Request timed out.
Request timed out.
Request timed out.
Ping statistics for 138.1.2.2:
Packets: Sent = 4, Received = 0, Lost = 4 (100% loss),
Approximate round trip times in milli-seconds:
Minimum = 0ms, Maximum = 0ms, Average = 0ms
C:>ping 138.1.3.2
Pinging 138.1.3.2 with 32 bytes of data:
Reply from 138.1.3.2: bytes=32 time=60ms TTL=241
Reply from 138.1.3.2: bytes=32 time=60ms TTL=241
Reply from 138.1.3.2: bytes=32 time=60ms TTL=241
Reply from 138.1.3.2: bytes=32 time=60ms TTL=241
Reply from 138.1.3.2: bytes=32 time=60ms TTL=241
Ping statistics for 138.1.3.2: Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 50ms, Maximum = 60ms, Average = 55ms
Отключим списки доступа на маршрутизаторах
RouterA#config t
RouterA(config)#interface s0
RouterA(config-if)#no ip access-group 1 in
RouterB#config t
RouterB(config)#interface s0
RouterB(config-if)#no ip access-group 1 in
RouterC#config t
RouterC(config)#interface s1
RouterC(config-if)#no ip access-group 1 in
RouterE#config t
RouterE(config)#interface s0
RouterE(config-if)#no ip access-group 1
Проверим отключение списков доступа командами ping на рабочих станциях PC1-4 в рабочие станции PC1-4.
PC1:
C:>ping 138.1.1.2
Pinging 138.1.1.2 with 32 bytes of data:
Reply from 138.1.1.2: bytes=32 time=60ms TTL=241
Reply from 138.1.1.2: bytes=32 time=60ms TTL=241
Reply from 138.1.1.2: bytes=32 time=60ms TTL=241
Reply from 138.1.1.2: bytes=32 time=60ms TTL=241
Reply from 138.1.1.2: bytes=32 time=60ms TTL=241
Ping statistics for 138.1.1.2: Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 50ms, Maximum = 60ms, Average = 55ms
C:>ping 138.1.2.2
Pinging 138.1.2.2 with 32 bytes of data:
Reply from 138.1.2.2: bytes=32 time=60ms TTL=241
Reply from 138.1.2.2: bytes=32 time=60ms TTL=241
Reply from 138.1.2.2: bytes=32 time=60ms TTL=241
Reply from 138.1.2.2: bytes=32 time=60ms TTL=241
Reply from 138.1.2.2: bytes=32 time=60ms TTL=241
Ping statistics for 138.1.2.2: Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 50ms, Maximum = 60ms, Average = 55ms
C:>ping 138.1.3.2
Pinging 138.1.3.2 with 32 bytes of data:
Reply from 138.1.3.2: bytes=32 time=60ms TTL=241
Reply from 138.1.3.2: bytes=32 time=60ms TTL=241
Reply from 138.1.3.2: bytes=32 time=60ms TTL=241
Reply from 138.1.3.2: bytes=32 time=60ms TTL=241
Reply from 138.1.3.2: bytes=32 time=60ms TTL=241
Ping statistics for 138.1.3.2: Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 50ms, Maximum = 60ms, Average = 55ms
C:>ping 138.1.4.2
Pinging 138.1.4.2 with 32 bytes of data:
Reply from 138.1.4.2: bytes=32 time=60ms TTL=241
Reply from 138.1.4.2: bytes=32 time=60ms TTL=241
Reply from 138.1.4.2: bytes=32 time=60ms TTL=241
Reply from 138.1.4.2: bytes=32 time=60ms TTL=241
Reply from 138.1.4.2: bytes=32 time=60ms TTL=241
Ping statistics for 138.1.4.2: Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 50ms, Maximum = 60ms, Average = 55ms
PC2:
C:>ping 138.1.1.2
Pinging 138.1.1.2 with 32 bytes of data:
Reply from 138.1.1.2: bytes=32 time=60ms TTL=241
Reply from 138.1.1.2: bytes=32 time=60ms TTL=241
Reply from 138.1.1.2: bytes=32 time=60ms TTL=241
Reply from 138.1.1.2: bytes=32 time=60ms TTL=241
Reply from 138.1.1.2: bytes=32 time=60ms TTL=241
Ping statistics for 138.1.1.2: Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 50ms, Maximum = 60ms, Average = 55ms
C:>ping 138.1.3.2
Pinging 138.1.3.2 with 32 bytes of data:
Reply from 138.1.3.2: bytes=32 time=60ms TTL=241
Reply from 138.1.3.2: bytes=32 time=60ms TTL=241
Reply from 138.1.3.2: bytes=32 time=60ms TTL=241
Reply from 138.1.3.2: bytes=32 time=60ms TTL=241
Reply from 138.1.3.2: bytes=32 time=60ms TTL=241
Ping statistics for 138.1.3.2: Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 50ms, Maximum = 60ms, Average = 55ms
C:>ping 138.1.4.2
Pinging 138.1.4.2 with 32 bytes of data:
Reply from 138.1.4.2: bytes=32 time=60ms TTL=241
Reply from 138.1.4.2: bytes=32 time=60ms TTL=241
Reply from 138.1.4.2: bytes=32 time=60ms TTL=241
Reply from 138.1.4.2: bytes=32 time=60ms TTL=241
Reply from 138.1.4.2: bytes=32 time=60ms TTL=241
Ping statistics for 138.1.4.2: Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 50ms, Maximum = 60ms, Average = 55ms
PC3:
C:>ping 138.1.1.2
Pinging 138.1.1.2 with 32 bytes of data:
Reply from 138.1.1.2: bytes=32 time=60ms TTL=241
Reply from 138.1.1.2: bytes=32 time=60ms TTL=241
Reply from 138.1.1.2: bytes=32 time=60ms TTL=241
Reply from 138.1.1.2: bytes=32 time=60ms TTL=241
Reply from 138.1.1.2: bytes=32 time=60ms TTL=241
Ping statistics for 138.1.1.2: Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 50ms, Maximum = 60ms, Average = 55ms
C:>ping 138.1.2.2
Pinging 138.1.2.2 with 32 bytes of data:
Reply from 138.1.2.2: bytes=32 time=60ms TTL=241
Reply from 138.1.2.2: bytes=32 time=60ms TTL=241
Reply from 138.1.2.2: bytes=32 time=60ms TTL=241
Reply from 138.1.2.2: bytes=32 time=60ms TTL=241
Reply from 138.1.2.2: bytes=32 time=60ms TTL=241
Ping statistics for 138.1.2.2: Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 50ms, Maximum = 60ms, Average = 55ms
C:>ping 138.1.4.2
Pinging 138.1.4.2 with 32 bytes of data:
Reply from 138.1.4.2: bytes=32 time=60ms TTL=241
Reply from 138.1.4.2: bytes=32 time=60ms TTL=241
Reply from 138.1.4.2: bytes=32 time=60ms TTL=241
Reply from 138.1.4.2: bytes=32 time=60ms TTL=241
Reply from 138.1.4.2: bytes=32 time=60ms TTL=241
Ping statistics for 138.1.4.2: Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 50ms, Maximum = 60ms, Average = 55ms
PC4:
C:>ping 138.1.1.2
Pinging 138.1.1.2 with 32 bytes of data:
Reply from 138.1.1.2: bytes=32 time=60ms TTL=241
Reply from 138.1.1.2: bytes=32 time=60ms TTL=241
Reply from 138.1.1.2: bytes=32 time=60ms TTL=241
Reply from 138.1.1.2: bytes=32 time=60ms TTL=241
Reply from 138.1.1.2: bytes=32 time=60ms TTL=241
Ping statistics for 138.1.1.2: Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 50ms, Maximum = 60ms, Average = 55ms
C:>ping 138.1.2.2
Pinging 138.1.2.2 with 32 bytes of data:
Reply from 138.1.2.2: bytes=32 time=60ms TTL=241
Reply from 138.1.2.2: bytes=32 time=60ms TTL=241
Reply from 138.1.2.2: bytes=32 time=60ms TTL=241
Reply from 138.1.2.2: bytes=32 time=60ms TTL=241
Reply from 138.1.2.2: bytes=32 time=60ms TTL=241
Ping statistics for 138.1.2.2: Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 50ms, Maximum = 60ms, Average = 55ms
C:>ping 138.1.3.2
Pinging 138.1.3.2 with 32 bytes of data:
Reply from 138.1.3.2: bytes=32 time=60ms TTL=241
Reply from 138.1.3.2: bytes=32 time=60ms TTL=241
Reply from 138.1.3.2: bytes=32 time=60ms TTL=241
Reply from 138.1.3.2: bytes=32 time=60ms TTL=241
Reply from 138.1.3.2: bytes=32 time=60ms TTL=241
Ping statistics for 138.1.3.2: Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 50ms, Maximum = 60ms, Average = 55ms
ВыВОДЫ
В ходе лабораторной работы были изучены возможности, предоставляемые списками доступа IOS Cisco, которые позволяют осуществить оптимизацию рассылки обновлений таблиц маршрутизации по сети.
Но, изучить практически удалось лишь стандартные списки доступа. Эмулятор Boson, версии, используемой в работе, не поддерживает расширенные списки доступа. А версия, которая поддерживает расширенные списки доступа, некорректно работает с маршрутизаторами. Замкнутый круг.