DDS Problems

[cabell911]

Does anyone see any problem with the following config. of two 56k CSU/DSU's? Notice the high input errors on one interface. Telco. says line seems to be fine and loopback test turns out ok. I just cleared the counters but they went back up in a matter of minutes. I'm at my end on this one.....Thanks for any help.

Serial0/0 is up, line protocol is up

Hardware is PQUICC with 56k 4-wire CSU/DSU

Description: connected to Cisco2611

Internet address is 172.16.1.2/24

MTU 1500 bytes, BW 64 Kbit, DLY 20000 usec,

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

Encapsulation HDLC, loopback not set

Keepalive set (10 sec)

Last input 00:00:07, output 00:00:02, output hang never

Last clearing of "show interface" counters never

Queueing strategy: fifo

Output queue 0/40, 1 drops; input queue 0/75, 0 drops

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

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

69 packets input, 4562 bytes, 0 no buffer

Received 18 broadcasts, 0 runts, 2 giants, 0 throttles

89 input errors, 8 CRC, 60 frame, 0 overrun, 0 ignored, 21 abort

99 packets output, 7061 bytes, 0 underruns

0 output errors, 0 collisions, 13 interface resets

0 output buffer failures, 0 output buffers swapped out

11 carrier transitions

DCD=up DSR=up DTR=up RTS=up CTS=up

Serial0 is up, line protocol is up

Hardware is HD64570 with 56k 4-wire CSU/DSU

Internet address is 172.16.1.1 255.255.255.0

MTU 1500 bytes, BW 56 Kbit, DLY 20000 usec, rely 255/255, load 9/255

Encapsulation HDLC, loopback not set, keepalive set (10 sec)

Last input 0:00:00, output 0:00:00, output hang never

Last clearing of "show interface" counters 2d14

Output queue 0/40, 11 drops; input queue 0/75, 0 drops

5 minute input rate 2000 bits/sec, 3 packets/sec

5 minute output rate 2000 bits/sec, 2 packets/sec

41707 packets input, 6697640 bytes, 0 no buffer

Received 29911 broadcasts, 0 runts, 0 giants

11 input errors, 7 CRC, 0 frame, 0 overrun, 0 ignored, 7 abort

36290 packets output, 5068207 bytes, 0 underruns

0 output errors, 0 collisions, 61 interface resets, 0 restarts

0 output buffer failures, 0 output buffers swapped out

114 carrier transitions

DCD=up DSR=up DTR=up RTS=up CTS=up

[thisisshanky]

Do you have any extended demarcs? When telco did loopback tests, did they test the SJ or at the extended demarc? was a hardware loopback used ?

Also your hardware can be tested by giving a hard loop at the router CSU/DSU port. Take a ethernet 8 wire cable and crimp a rj45 jack on one end, while at the other end, twist pins 1 and 7 together, and, pins 2 and 8 together. Now this is a hard loop. insert the rj 45 end to the router, and now the router Csu/dsu port has been looped.

Now you can do clear the interface counters, assign an ip address to the serial interface and then do extended ping tests, with varying data patterns of all 1s, all 0s and see if the errors are increasing

HTH

[cabell911]

Sorry it took so long to get back guys. Yes, I have done all of the loopback tests successfully and it doesnt seem to show any errors. I'm getting some TAC help on this but they are kind of slow. They seem to be leaning towards an IOS bug. Its currently 11.0(13).

JR