[c-nsp] Serial link CTS=down link UP

[omar parihuana]

I'll suggest that Provider change the CSU/DSU....  since that all signals
are not open a syncronization problem can be there...

Rgds.

On Thu, Dec 17, 2009 at 1:04 PM, Marcelo Zilio <ziliomarcelo at gmail.com>wrote:

> Hi,
>
> Has anyone seen this in serial interfaces before?
> Link is UP and traffic is going through, however router shows CTS=down
> besides a lot CRCs/Input Errors.
> It doesn't make sense to me the parameter which should advise that the link
> is "ready to go" is DOWN while there is traffic on it.
> Users are complaining some application are slow.
>
> The router is a Cisco 2811 IOS 12.4(15)T10.
>
> Router#sh int s0/1/0
> Serial0/1/0 is up, line protocol is up
>  Hardware is GT96K Serial
>  MTU 1500 bytes, BW 256 Kbit/sec, DLY 20000 usec,
>     reliability 255/255, txload 40/255, rxload 42/255
>  Encapsulation FRAME-RELAY IETF, loopback not set
>  Keepalive set (10 sec)
>  CRC checking enabled
>  LMI enq sent  48, LMI stat recvd 48, LMI upd recvd 0, DTE LMI up
>  LMI enq recvd 0, LMI stat sent  0, LMI upd sent  0
>  LMI DLCI 0  LMI type is ANSI Annex D  frame relay DTE  segmentation
> inactive
>  FR SVC disabled, LAPF state down
>  Broadcast queue 0/64, broadcasts sent/dropped 7/0, interface broadcasts 0
>  Last input 00:00:00, output 00:00:00, output hang never
>  Last clearing of "show interface" counters 00:07:55
>  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
>  Queueing strategy: dual fifo
>  Output queue: high size/max/dropped 0/256/0
>  Output queue: 0/128 (size/max)
>  30 second input rate 43000 bits/sec, 68 packets/sec
>  30 second output rate 41000 bits/sec, 78 packets/sec
>     34746 packets input, 2956769 bytes, 0 no buffer
>     Received 0 broadcasts, 0 runts, 0 giants, 0 throttles
>     602 input errors, 602 CRC, 433 frame, 107 overrun, 0 ignored, 323 abort
>     43237 packets output, 3308125 bytes, 0 underruns
>     0 output errors, 0 collisions, 0 interface resets
>     0 unknown protocol drops
>     0 output buffer failures, 0 output buffers swapped out
>     0 carrier transitions
>     DCD=up  DSR=up  DTR=up  RTS=up  *CTS=down*
>
>  Thanks,
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-- 
Omar E.P.T
-----------------
Certified Networking Professionals make better Connections!