problem with ATM E3 port

[pacquaviva]

Hi,

I noticed that the interface ATM E3 on my router give me this show in which there have been 74 carrier trnsitions in two hours and half.

Now, I would like to know how to understand if the fault is mine (on my PA)?

This router is in live environment and I have difficult to do a debug.

Is there other to do troubleshooting?

Thanks.

Regards.

Paolo

[Mohamed Sobair]

Paolo,

Could you please post the config of your router as well as the output of the E3 interface status?

Thanks,

[pacquaviva]

Hi,

This is a show interface:

7200-Acc#sh int a3/0

ATM3/0 is up, line protocol is up

Hardware is ENHANCED ATM PA

MTU 4470 bytes, sub MTU 4470, BW 33920 Kbit, DLY 200 usec,

reliability 255/255, txload 84/255, rxload 77/255

Encapsulation ATM, loopback not set

Encapsulation(s): AAL5

4095 maximum active VCs, 739 current VCCs

VC idle disconnect time: 300 seconds

32 carrier transitions

Last input 00:00:00, output 00:00:00, output hang never

Last clearing of "show interface" counters 00:40:31

Input queue: 0/1024/0/0 (size/max/drops/flushes); Total output drops: 5656

Queueing strategy: Per VC Queueing

30 second input rate 10325000 bits/sec, 2836 packets/sec

30 second output rate 11188000 bits/sec, 2735 packets/sec

7273362 packets input, 3385856469 bytes, 0 no buffer

Received 0 broadcasts, 0 runts, 3 giants, 0 throttles

3336 input errors, 3336 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort

7218217 packets output, 3726152299 bytes, 0 underruns

0 output errors, 0 collisions, 0 interface resets

0 output buffer failures, 0 output buffers swapped out

Il router is a Cisco 7206VXR with PA-E3 linked to a BPX 8600

PA-E3 --------------- BPX8600

I hope this is enough to understand what happens.

Thank you .

Regards.

Paolo

PA-E3

[tdrais]

carrier transitions are a incoming signal to the router. The router is just reporting the condition.

It is unlikely the router is causing this.

This basically means that the circuit went down. With ATM it will depend on if the atm switch is setting this because another circuit is down or if it a indication of the last hop.

When you get bursts of these on a ATM circuit and then it runs stable you could be getting clock slips.

You will need to contact your provider.

[pacquaviva]

Hi,

thus there isn't fault on my router.But when is the scenery becomes unmanaged?

Now there is traffic but how long does it last?

Thank you.

Regards

Paolo