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Cisco ROUTER - 라우터 기본 설정, 확인

category 네트워크/Cisco 2018. 10. 20. 13:50
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TEST Network

 ROUTER 시작 시 'Set-up Mode'가 나오는 경우
'Set-up Mode'는 실무에서 거의 사용하지 않는다.

1. 공장 출하

2. 관리자 모드에서 setup 명령어 사용 시

3. 설정 레지스터(Config Register)의 끝에서 두 번째 값0x2142처럼 4일 때

4. 설정 파일을 삭제(erase startup-config)한 후 재부팅할 때


빠져 나오는 방법 : Would you like to enter the initial configuration dialog? [yes/no] 에서 no 입력 or Ctrl+C


기본적인 Cisco ROUTER 모드 종류

Router>enable                                   // 이용자 모드 (User Mode) >
Router#configure terminal                       // 관리자 모드 (Privilege Mode) #
Router(config)#interface ethernet 0/0           // 전체 설정 모드 (전역 모드) (Global Configuration Mode) (config)# 
Router(config-if)#exit                          // 인터페이스 설정 모드 (config-if)#
Router(config)#line vty 0 4                     // ↑전 단계 (exit)
Router(config-line)#exit                        // 라인 설정모드 (config-line)#
Router(config)#router ospf 1                    // ↑전 단계 (exit)
Router(config-router)#end                       // 라우터 설정 모드 (config-router)#
Router#                                         // ↑↑관리자 모드 단계 (end) (Ctrl + Z) 


Cisco ROUTER 기본 설정[각주:1]

Router>                                              // 이용자 모드 >
Router>enable
Router#configure terminal                            // 관리자 모드 #
Enter configuration commands, one per line.  End with CNTL/Z.  // 관리자 모드 진입시 나타나는 문구

Router(config)#hostname R1                            // 라우터 이름 설정 (인증용 ID로도 사용된다.)
R1(config)#enable secret cisco                        // 라우터 관리자 모드 암호 지정 (MD5)
R1(config)#no ip domain-lookup                        // 문자열 입력으로 인한 DNS SERVER 찾는 시간 방지
                                                         Translating "xxxx"...domain server (xxx.xxx.xxx.xxx)
R1(config)#banner motd *                              // 배너 추가 (임의 문자 사용 가능)
Enter TEXT message.  End with the character '*'.
DON'T ACCESS THIS ROUTER IF YOU DON'T HAVE AUTHORIZATION!!
*

R1(config)#line console 0                             // 콘솔 라인 설정모드
R1(config-line)#logging synchronous                   // 시스템 메세지 표시 때 줄바꿈 위한 명령어
R1(config-line)#exec-timeout 0                        // 명령어 입력 없을 때 콘솔 밖으로 빠져나오는 것 방지
R1(config-line)#exit                                  // ↑전 단계

R1(config)#line vty 0 4                               // 텔넷 라인 설정모드
R1(config-line)#password cisco                        // 텔넷 암호 지정
R1(config-line)#exit                                  // ↑전 단계
R1(config)#exit                                       // ↑전 단계

R1#copy running-config startup-config                 // DRAM(running-config)값을 NVRAM(startup-config)값으로 저장
Destination filename [startup-config]?                // Enter
Building configuration...                             // 저장 중
[OK]                                                  // 저장 완료


Cisco ROUTER 현재 설정 확인

Router>enable
Router#show running-config                             // DRAM(running-config) 값 확인
Building configuration...

Current configuration : 1572 bytes
!
! Last configuration change at 07:36:09 EET Sat Feb 1 2020
!
version 15.4
service timestamps debug datetime msec
service timestamps log datetime msec
no service password-encryption
!
...


Cisco ROUTER 초기화 방법

Router#erase startup-config                             // erase 명령어를 이용하여 NVRAM(startup-config) 값 제거
Erasing the nvram filesystem will remove all configuration files! Continue? [confirm]
[OK]
Erase of nvram: complete
Router#reload                                           // 재부팅


Cisco ROUTER 시간 확인

R1#show clock
*11:08:09.476 EET Thu Feb 6 2020                        // 시:분:초.밀리세컨드 표준시 요일 월 일 년 
R1#clock set 18:11:00 6 February 2020                   // clock set 시:분:초 일 월 년
R1#
*Feb  6 16:11:00.000: %SYS-6-CLOCKUPDATE: System clock has been updated from 11:14:31 EET Thu Feb 6 2020 to 18:11:00 EET Thu Feb 6 2020, configured from console by console.


Cisco ROUTER 라인 상황 확인하기

Router#show line
   Tty Typ     Tx/Rx    A Modem  Roty AccO AccI   Uses   Noise  Overruns   Int
*     0 CTY              -    -      -    -    -      0       0     0/0       -
      1 AUX   9600/9600  -    -      -    -    -      0       0     0/0       -       // 현재 접속되어있는 LINE
      2 VTY              -    -      -    -    -      0       0     0/0       -
      3 VTY              -    -      -    -    -      0       0     0/0       -
      4 VTY              -    -      -    -    -      0       0     0/0       -
      5 VTY              -    -      -    -    -      0       0     0/0       -
      6 VTY              -    -      -    -    -      0       0     0/0       -


Cisco ROUTER Interface IP 기본 설정 & 주소 부여
R1#configure terminal                                   // conf t
Enter configuration commands, one per line.  End with CNTL/Z.

R1(config)#interface serial 1/0                         // int s1/0
R1(config-if)#description FOR R2 PORT                   // desc
R1(config-if)#ip address 172.17.1.1 255.255.0.0         // ip add
R1(config-if)#no shutdown                               // no sh
R1(config-if)#exit
R1(config)#interface ethernet 0/0                       // int e0/0
R1(config-if)#description FOR ISP1 PORT                 // desc
R1(config-if)#ip address 192.168.11.10 255.255.255.0    // ip add
R1(config-if)#no shutdown                               // no sh
R1(config-if)#exit

R2#configure terminal
Enter configuration commands, one per line.  End with CNTL/Z.

R2(config)#interface serial 1/0                         // int s1/0
R2(config-if)#description FOR R1 PORT                   // desc
R2(config-if)#ip address 172.17.1.2 255.255.0.0         // ip add
R2(config-if)#no shutdown                               // no sh
R2(config-if)#exit
R2(config)#interface ethernet 0/0                       // int e0/0
R2(config-if)#description FOR ISP2 PORT                 // desc
R2(config-if)#ip address 192.168.11.11 255.255.255.0    // ip add
R2(config-if)#no shutdown                               // no sh
R2(config-if)#exit


Cisco ROUTER Interface 동작 상태, 입력된 IP 주소 확인
Router#show ip interface brief           // sh ip int br
Interface                  IP-Address      OK? Method Status                Protocol
...


R1#show ip interface brief               // sh ip int br
Interface                  IP-Address      OK? Method Status                Protocol
Ethernet0/0                192.168.11.10   YES manual up                    up      
Ethernet0/1                unassigned      YES NVRAM  administratively down down    
Ethernet0/2                unassigned      YES NVRAM  administratively down down    
Ethernet0/3                unassigned      YES NVRAM  administratively down down    
Serial1/0                  172.17.1.1      YES manual up                    up    
Serial1/1                  unassigned      YES NVRAM  administratively down down    
Serial1/2                  unassigned      YES NVRAM  administratively down down    
Serial1/3                  unassigned      YES NVRAM  administratively down down    
R2#show ip interface brief               // sh ip int br
Interface                  IP-Address      OK? Method Status                Protocol
Ethernet0/0                192.168.11.11   YES manual up                    up      
Ethernet0/1                unassigned      YES NVRAM  administratively down down    
Ethernet0/2                unassigned      YES NVRAM  administratively down down    
Ethernet0/3                unassigned      YES NVRAM  administratively down down    
Serial1/0                  172.17.1.2      YES manual up                    up    
Serial1/1                  unassigned      YES NVRAM  administratively down down    
Serial1/2                  unassigned      YES NVRAM  administratively down down    
Serial1/3                  unassigned      YES NVRAM  administratively down down    


Cisco ROUTER 각 Interface별 정보 확인

Router#show interface ethernet 0/0           // sh int e0/0
Ethernet0/0 is up, line protocol is up 
  Hardware is AmdP2, address is aabb.cc00.1000 (bia aabb.cc00.1000)
...


R1#show interface ethernet 0/0                                       // sh int e0/0
Ethernet0/0 is up, line protocol is up                               // 라인 상태
  Hardware is AmdP2, address is aabb.cc00.1000 (bia aabb.cc00.1000)  // MAC 주소
  Description: FOR ISP1 PORT                                         // Description
  Internet address is 192.168.11.10/24                               // IP 주소, 서브넷 마스크
  MTU 1500 bytes, BW 10000 Kbit/sec, DLY 1000 usec,
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation ARPA, loopback not set                               // Encapsulation, Loopback
  Keepalive set (10 sec)
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input 00:00:01, output 00:00:02, output hang never
  Last clearing of "show interface" counters never
  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
  Queueing strategy: fifo
  Output queue: 0/40 (size/max)
  5 minute input rate 2000 bits/sec, 2 packets/sec
  5 minute output rate 0 bits/sec, 0 packets/sec
     496 packets input, 123673 bytes, 0 no buffer
     Received 183 broadcasts (0 IP multicasts)
     0 runts, 0 giants, 0 throttles 
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     0 input packets with dribble condition detected
     34 packets output, 3905 bytes, 0 underruns
     0 output errors, 0 collisions, 1 interface resets
     19 unknown protocol drops
     0 babbles, 0 late collision, 0 deferred
     0 lost carrier, 0 no carrier
     0 output buffer failures, 0 output buffers swapped out


Cisco ROUTER Routing Table 확인

Router#show ip route               // sh ip rou
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area 
       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
       E1 - OSPF external type 1, E2 - OSPF external type 2
       i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
       ia - IS-IS inter area, * - candidate default, U - per-user static route
       o - ODR, P - periodic downloaded static route, H - NHRP, l - LISP
       a - application route
       + - replicated route, % - next hop override
...


R1#show ip route
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area 
(생략)

Gateway of last resort is 192.168.11.2 to network 0.0.0.0

S*    0.0.0.0/0 [1/0] via 192.168.11.2
      172.17.0.0/16 is variably subnetted, 2 subnets, 2 masks
C        172.17.0.0/16 is directly connected, Serial1/0
L        172.17.1.1/32 is directly connected, Serial1/0
      192.168.11.0/24 is variably subnetted, 2 subnets, 2 masks
C        192.168.11.0/24 is directly connected, Ethernet0/0
L        192.168.11.10/32 is directly connected, Ethernet0/0
R2#show ip route
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area 
(생략)

Gateway of last resort is 192.168.11.2 to network 0.0.0.0

S*    0.0.0.0/0 [1/0] via 192.168.11.2
      172.17.0.0/16 is variably subnetted, 2 subnets, 2 masks
C        172.17.0.0/16 is directly connected, Serial1/0
L        172.17.1.2/32 is directly connected, Serial1/0
      192.168.11.0/24 is variably subnetted, 2 subnets, 2 masks
C        192.168.11.0/24 is directly connected, Ethernet0/0
L        192.168.11.11/32 is directly connected, Ethernet0/0


  1. banner motd 부분의 *은 입력 시작과 끝을 나타내며, 다른 임의의 문자로 사용할 수 있다. 또한 default-value exec-character-bits 8 명령어를 사용 하면 한글로 배너를 달 수 있다. [본문으로]
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