네트워크/라우터

0508 라우터 loopback과 축약

work01 2020. 5. 10. 17:47

R1]
enable
conf t


int e0/0
ip add 172.16.0.254 255.255.255.0

int e0/1

====> int loopback 0(장치 대신씀 테스트 용도 21억개까지 지정가능 ethernet 0/0)


[R1]
interface loopback 0
ip add 172.16.0.254 255.255.255.0

interface loopback 1
ip add 172.16.1.254 255.255.255.0

interface loopback 2
ip add 172.16.2.254 255.255.255.0

interface loopback 3
ip add 172.16.3.254 255.255.255.0

interface loopback 4
ip add 172.16.4.254 255.255.255.0

interface loopback 5
ip add 172.16.5.254 255.255.255.0

interface loopback 6
ip add 172.16.6.254 255.255.255.0

interface loopback 7
ip add 172.16.7.254 255.255.255.0

interface loopback 8
ip add 172.16.8.254 255.255.255.0

interface loopback 9
ip add 172.16.9.254 255.255.255.0

interface loopback 10
ip add 172.16.10.254 255.255.255.0

interface loopback 11
ip add 172.16.11.254 255.255.255.0

interface loopback 12
ip add 172.16.12.254 255.255.255.0

interface loopback 13
ip add 172.16.13.254 255.255.255.0

interface loopback 14
ip add 172.16.14.254 255.255.255.0

interface loopback 15
ip add 172.16.15.254 255.255.255.0

interface s 2/0
ip add 192.168.12.1 255.255.255.0
~static~
ip route 172.16.1.254 255.255.255.0

[R2]
interface loopback 16
ip add 172.16.16.254 255.255.255.0

interface loopback 17
ip add 172.16.17.254 255.255.255.0

interface loopback 18
ip add 172.16.18.254 255.255.255.0

interface loopback 19
ip add 172.16.19.254 255.255.255.0

interface loopback 20
ip add 172.16.20.254 255.255.255.0

interface loopback 21
ip add 172.16.21.254 255.255.255.0

interface loopback 22
ip add 172.16.22.254 255.255.255.0

interface loopback 23
ip add 172.16.23.254 255.255.255.0

interface loopback 24
ip add 172.16.24.254 255.255.255.0

interface loopback 25
ip add 172.16.25.254 255.255.255.0

interface loopback 26
ip add 172.16.26.254 255.255.255.0

interface loopback 27
ip add 172.16.27.254 255.255.255.0

interface loopback 28
ip add 172.16.28.254 255.255.255.0

interface loopback 29
ip add 172.16.29.254 255.255.255.0

interface loopback 30
ip add 172.16.30.254 255.255.255.0

interface loopback 31
ip add 172.16.31.254 255.255.255.0

interface s 2/0
ip add 192.168.12.2 255.255.255.0

interface s 2/1
ip add 192.168.23.1 255.255.255.0
~static~


[R3]
interface loopback 0
ip add 10.1.0.0 255.255.255.0

interface loopback 1
ip add 10.1.1.1 255.255.255.0

interface loopback 2
ip add 10.1.2.2 255.255.255.0

interface loopback 3
ip add 10.1.3.3 255.255.255.0

interface loopback 4
ip add 10.1.4.4 255.255.255.0

interface loopback 5
ip add 10.1.5.5 255.255.255.0


interface s 2/1
ip add 192.168.23.2 255.255.255.0

~static~

이렇게 긴 루프백을 축약을 이용하여 세개로 줄일 수 있다.

축약
subnet -00000000.000000000….
128 64 32 16 8 4 2 1
-------
supernet
128 64 32 16 8 4 2 1
<--------------
128+64+32+8= 240

172.16.0.0 -- 255.255.240.0

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