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E1 Link

For Router 2811 connected to Two Main Roters through redundant E1 links,

one of the problematic link is showing as

sh int ser0/3/0:0

MTU 1500 bytes, BW 1984 Kbit, DLY 20000 usec,

reliability 247/255, txload 1/255, rxload 1/255

Encapsulation PPP, LCP Open

ACKrcvd: CDPCP

Open: IPCP, loopback not set

Keepalive set (10 sec)

Last input 00:00:01, output 00:00:01, output hang never

Last clearing of "show interface" counters 5w4d

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 0/2/256 (active/max active/max total)

Reserved Conversations 0/0 (allocated/max allocated)

Available Bandwidth 1488 kilobits/sec

5 minute input rate 0 bits/sec, 0 packets/sec

5 minute output rate 0 bits/sec, 0 packets/sec

1253026 packets input, 41299196 bytes, 0 no buffer

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

1162047252 input errors, 1162047252 CRC, 159381633 frame, 86369 overrun, 0

ignored, 158804302 abort

2116905 packets output, 278812603 bytes, 0 underruns

0 output errors, 0 collisions, 17017 interface resets

0 output buffer failures, 0 output buffers swapped out

8 carrier transitions

Timeslot(s) Used:1-31, SCC: 0, Transmitter delay is 0 flags

fine link is showing as below

Hardware is GT96K Serial

MTU 1500 bytes, BW 1984 Kbit, DLY 20000 usec,

reliability 255/255, txload 1/255, rxload 1/255

Encapsulation PPP, LCP Open

Open: IPCP, CDPCP, loopback not set

Keepalive set (10 sec)

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

Last clearing of "show interface" counters 5w4d

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 0/7/256 (active/max active/max total)

Reserved Conversations 0/0 (allocated/max allocated)

Available Bandwidth 1488 kilobits/sec

5 minute input rate 0 bits/sec, 1 packets/sec

5 minute output rate 0 bits/sec, 1 packets/sec

2731947 packets input, 316933485 bytes, 0 no buffer

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

200 input errors, 200 CRC, 126 frame, 89 overrun, 0 ignored, 79 abort

3227477 packets output, 455489904 bytes, 0 underruns

0 output errors, 0 collisions, 1 interface resets

0 output buffer failures, 0 output buffers swapped out

8 carrier transitions

Timeslot(s) Used:1-31, SCC: 1, Transmitter delay is 0 flags

what can be the problem, is there any documents for this Protocols status

1 REPLY
Hall of Fame Super Silver

Re: E1 Link

Hello Cisco-blue,

the message PPP LCP open and IPCP open means that a successful PPP negotiation has been completed.

the message ACKrcvd: CDPCP is only related to CDPCP that is the PPP control protocol for PPP.

This can mean only side has CDP enabled but it shouldn't be a real issue.

The real troubles come when looking at the interface counters:

1253026 packets input, 41299196 bytes, 0 no buffer

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

1162047252 input errors, 1162047252 CRC, 159381633 frame, 86369 overrun, 0

ignored, 158804302 abort

the number of errors is far bigger then the number of correctly received frames.

This can be the sign of a problem in the past or during testing.

I would suggest to clear counters and to see if error counters increase over time.

to help in troubleshooting serial interfaces including E1 look at

http://www.cisco.com/en/US/docs/internetworking/troubleshooting/guide/tr1915.html

and for E1/T1

http://www.cisco.com/en/US/tech/tk713/tk628/technologies_tech_note09186a00800a758d.shtml

Hope to help

Giuseppe

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