Cisco Systems OL-6426-02 Benutzerhandbuch

To verify that you have properly configured the loopback interface, enter the show interface loopback 
command. You should see verification output similar to the following example.

Router# show interface loopback 0

Loopback0 is up, line protocol is up 

  Hardware is Loopback

  Internet address is 200.200.100.1/24

  MTU 1514 bytes, BW 8000000 Kbit, DLY 5000 usec, 

     reliability 255/255, txload 1/255, rxload 1/255

  Encapsulation LOOPBACK, loopback not set

  Last input never, output never, output hang never

  Last clearing of "show interface" counters never

  Queueing strategy: fifo

  Output queue 0/0, 0 drops; input queue 0/75, 0 drops

  5 minute input rate 0 bits/sec, 0 packets/sec

  5 minute output rate 0 bits/sec, 0 packets/sec

     0 packets input, 0 bytes, 0 no buffer

     Received 0 broadcasts, 0 runts, 0 giants, 0 throttles

     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort

     0 packets output, 0 bytes, 0 underruns

     0 output errors, 0 collisions, 0 interface resets

     0 output buffer failures, 0 output buffers swapped out

Another way to verify the loopback interface is to ping it:

Router# ping 200.200.100.1 

Type escape sequence to abort.

Sending 5, 100-byte ICMP Echos to 200.200.100.1, timeout is 2 seconds:

!!!!!

Success rate is 100 percent (5/5), round-trip min/avg/max = 1/2/4 ms

Perform these steps to configure parameters to control access to the router, beginning in global 
configuration mode:

line [aux | console | tty | vty] line-number 

Router(config)# line console 0

Router(config)# 

Enters line configuration mode, and specifies the 
type of line.

This example specifies a console terminal for 
access.

password password

Router(config)# password 5dr4Hepw3

Router(config)# 

Specifies a unique password for the console 
terminal line.