Cisco 1720 - Many Input Errors, CRC and the like
Posted on 2004-09-02
A little about my setup:
I have a Cisco 1720 Connected to a Fractional T1 through a phone compnay owned CSU/DSU. We are using 7 timeslots, or 448k. This is our border router and is used strictly at this point as our Internet Connection and that is all.
Auditing the interfaces, I noticed the listed below show interface serial 0 command with many input errors.
MTU 1500 bytes, BW 448 Kbit, DLY 20000 usec,
reliability 255/255, txload 4/255, rxload 19/255
Encapsulation HDLC, loopback not set
Keepalive set (10 sec)
Last input 00:00:04, output 00:00:00, output hang never
Last clearing of "show interface" counters never
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 1
Queueing strategy: weighted fair
Output queue: 0/1000/64/0 (size/max total/threshold/drops)
Conversations 0/24/256 (active/max active/max total)
Reserved Conversations 0/0 (allocated/max allocated)
5 minute input rate 34000 bits/sec, 6 packets/sec
5 minute output rate 8000 bits/sec, 6 packets/sec
3020709 packets input, 2582061765 bytes, 0 no buffer
Received 124253 broadcasts, 0 runts, 5 giants, 0 throttles
8570 input errors, 1664 CRC, 1345 frame, 0 overrun, 0 ignored, 5558 abort
2485337 packets output, 300385519 bytes, 0 underruns
0 output errors, 0 collisions, 1 interface resets
0 output buffer failures, 0 output buffers swapped out
9 carrier transitions
DCD=up DSR=up DTR=up RTS=up CTS=up
Now, considering the error rate % is .003% -- not too bad, and I'm not particularly noticing any performance issues. The last time I cleared this counter was about a 10 days ago.
Things I have Checked:
* I have taken the router to the Smart Jack in the Phone Room and plugged directly in, same results as far as error incrementing. This elimated the cabling between CSU/DSU and Router.
* I have called our ISP who called CTSI (our phone company) and they apparently came on site when I wasn't hear and tested their equipment, they had no troubles. (this doesn't surprise me)
* Phone company says there must be something wrong with your Router
Is there anything else I should focus my eyes on with this type of problem?
I was reading another post and they used the command show controllers serial 0, and that shows me another little bit of info (i guess it reads the Serial Card directly)? Here the end of that information.
buffer size 1524
PowerQUICC SCC specific errors:
5558 input aborts on receiving flag sequence
0 throttles, 0 enables
0 transmitter underruns
0 transmitter CTS losts
I hate dealing with the phone company, they are always perfect.