There is no way you can spoof a serial line to up/up state via
configuration...
Here is what I did:
!
interface Serial1
ip address 10.1.1.1 255.255.255.0
loopback
no keepalive
!
Still...
R2#sh int ser 1
Serial1 is down, line protocol is down
Hardware is PQUICC Serial
Internet address is 10.1.1.1/24
MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation HDLC, crc 16, loopback set
Keepalive not set
Scramble enabled
Last input never, output never, 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: weighted fair
Output queue: 0/1000/64/0 (size/max total/threshold/drops)
Conversations 0/0/256 (active/max active/max total)
Reserved Conversations 0/0 (allocated/max allocated)
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, 33 interface resets
0 output buffer failures, 0 output buffers swapped out
0 carrier transitions
Cable attached: No cable
Hardware config: No cable; DTE; DSR = DOWN DTR = DOWN RTS = DOWN
CTS = DOWN DCD = DOWN
If you haven't attached a cable, serial interface will always be
down/down.
Only if you build a harware loopback interface and can cross the correct
signals you can spoof the interface...
Only the Ethernet intarfaces can be spoofed by disabling the keepalives..
Dvass
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