Park,
I had exactly the same problem this morning on a
point-to-point circuit. I power cycled CSUs on both
ends and everything came back up.
If that doesn't work, and your CSUs support it, you
may want to throw a loopback towards one end and check
to see if the router sees it. The interface should go
to UP/UP/Looped, that would verify your path.
Debbie
--- "Lupi, Guy" wrote:
> Park, if you look at the output you can see that the
> last time you cleared
> the counters on the interface was approximately 18
> hours ago:
>
> Last clearing of "show interface" counters 18:08:32
>
> Since that time you have had:
>
> 8940 input errors, 1913 CRC, 0 frame, 6028 overrun,
> 0 ignored, 999 abort
>
> 3438 interface resets
>
> This would indicate that there is a problem with the
> T1 line or the cabling
> between the router(s) and their interface with the
> T1 whether it be through
> a V.35 into a CSU, or a straight cable into the NIU
> or smartjack. I would
> recommend calling the circuit into the carrier that
> provides it and asking
> them to test the line. In my experience about 97%
> of the time it is a
> carrier issue such as a bad cross connect in the CO.
> It is also possible,
> although very unlikely, that the router interface
> itself has a problem but
> you will probably find that this is a carrier issue
> and that it can be
> repaired by them.
>
> -----Original Message-----
> From: park jeongwoo
> To: [EMAIL PROTECTED]
> Sent: 5/18/01 11:04 AM
> Subject: point to point T1 troubleshooting [7:4987]
>
> HI all
> Have anyone troubleshooted PPP TI before?
> it is leased line and ppp encapsulation.
> Here is output of "sh int s2/0"
>
> #sh int s2/0
> Serial2/0 is up, line protocol is down
> Hardware is M4T
> Description: Leased Line to branch
> Internet address is 10.10.14.86/30
> MTU 1500 bytes, BW 2048 Kbit, DLY 20000 usec,
> reliability 255/255, txload 1/255, rxload 1/255
> Encapsulation PPP, crc 16, loopback not set
> Keepalive set (10 sec)
> LCP Listen
> Closed: IPCP, CDPCP
> Last input never, output 00:00:03, output hang
> never
> Last clearing of "show interface" counters
> 18:08:32
> Input queue: 0/75/0 (size/max/drops); Total output
> drops: 0
> Queueing strategy: weighted fair
> Output queue: 0/1000/64/0 (size/max
> total/threshold/drops)
> Conversations 0/1/256 (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, 2368 giants, 0
> throttles
> 8940 input errors, 1913 CRC, 0 frame, 6028
> overrun, 0 ignored, 999 abort
> 13556 packets output, 189784 bytes, 0 underruns
> 0 output errors, 0 collisions, 3438 interface
> resets
> 0 output buffer failures, 0 output buffers
> swapped out
> 3672 carrier transitions DCD=up DSR=up
> DTR=up RTS=up CTS=up
>
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