Ситуація наступна. Після перенесення обладнання в іншу шафу перестав працювати один модем. Дивимося інформацію по інтерфейсу
show int serial0/1/0
Serial0/1/0 is down, line protocol is down
Hardware is HWIC-Serial
Internet address is 10.85.253.33/30
MTU 1500 bytes, BW 57 Kbit, DLY 100000 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation PPP, LCP Closed, loopback not set
Keepalive not set
DTR is pulsed for 5 seconds on reset
Last input never, output 00:32:57, output hang never
Last clearing of "show interface" counters 00:35:48
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 0/1/16 (active/max active/max total)
Reserved Conversations 0/0 (allocated/max allocated)
Available Bandwidth 42 kilobits/sec
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
3 packets output, 72 bytes, 0 underruns
0 output errors, 0 collisions, 3 interface resets
0 output buffer failures, 0 output buffers swapped out
0 carrier transitions
DCD=down DSR=down DTR=down RTS=down CTS=down
Ніби все добре, наступна команда
show controllers serial0/1/0
HWIC-Serial unit 0 slot 0/1/0,
No serial cable attached
Stats for LED(s):
Loopback bitmask 0x0
LED1 is Green
HWIC Register Base: 0x43A00000
------------------
HWIC Common Registers:
---------------------
id(0x00): 0x00000001 rev(0x01): 0x00000002 status(0x02): 0x00000000
tx crc(0x01): 0x00000000 ctrl(0x06): 0x00008081
HWIC Serial Common Registers:
----------------------------
hwic_serial_rev(0x1000): 0x07292004 hwic_serial_ctrl(0x1004): 0x00000009
intr1_enable(0x1020): 0x0000002A intr2_enable(0x1022): 0x0000000F
HWIC Serial SCC Registers:
----------------------------
ch_mode_cfg: 0x08019035 ch_flag_cfg: 0x00001311 ch_floctrl_cfg: 0x00003200
..........
Все опинилося дуже просто не до кінця запханий кабель.
router#show int serial0/1/0
Serial0/1/0 is up, line protocol is up
Hardware is HWIC-Serial
Internet address is 10.85.253.33/30
MTU 1500 bytes, BW 57 Kbit, DLY 100000 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation PPP, LCP Open
Open: IPCP, loopback not set
Keepalive not set
DTR is pulsed for 5 seconds on reset
Last input 00:00:00, output 00:00:01, output hang never
Last clearing of "show interface" counters 00:36:30
Input queue: 1/75/0/0 (size/max/drops/flushes); Total output drops: 0
Queueing strategy: weighted fair
Output queue: 0/1000/64/0 (size/max total/threshold/drops)
Conversations 0/1/16 (active/max active/max total)
Reserved Conversations 0/0 (allocated/max allocated)
Available Bandwidth 42 kilobits/sec
5 minute input rate 0 bits/sec, 1 packets/sec
5 minute output rate 0 bits/sec, 1 packets/sec
9 packets input, 248 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
9 packets output, 217 bytes, 0 underruns
0 output errors, 0 collisions, 3 interface resets
0 output buffer failures, 0 output buffers swapped out
0 carrier transitions
DCD=up DSR=up DTR=down RTS=down CTS=up
Як бачим все запрацювало "line protocol is up"
