Question

Debugging Cisco input errors

Asked by: ibtaya

Have a p2p t with two cisco 1720's terminating.  One side is giving me input and abort errors when I do a show int (attached)  the other side is not showing any errors.  

My switch is showing excessive collisions from the cable attached to the Fa0 from the 1720.

My question is, how do I debug this.  I have syslog logging but there is nothing good being logged and yet I am dropping packets and the routers continue to increase in error numbers when I do a show int.

A side show int
 
Main1721#show int
FastEthernet0 is up, line protocol is up
  Hardware is PQUICC_FEC, address is 0011.204c.b3de (bia 0011.204c.b3de)
  Internet address is 10.1.1.3/23
  MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation ARPA, loopback not set
  Keepalive set (10 sec)
  Full-duplex, 100Mb/s, 100BaseTX/FX
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input 00:00:00, output 00:00:00, output hang never
  Last clearing of "show interface" counters never
  Input queue: 2/75/0/0 (size/max/drops/flushes); Total output drops: 0
  Queueing strategy: fifo
  Output queue: 0/40 (size/max)
  5 minute input rate 153000 bits/sec, 133 packets/sec
  5 minute output rate 719000 bits/sec, 123 packets/sec
     114511 packets input, 18678099 bytes
     Received 25621 broadcasts, 0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     0 watchdog
     0 input packets with dribble condition detected
     111316 packets output, 88259759 bytes, 0 underruns
     0 output errors, 0 collisions, 2 interface resets
     0 babbles, 0 late collision, 0 deferred
     0 lost carrier, 0 no carrier
     0 output buffer failures, 0 output buffers swapped out
Serial0 is up, line protocol is up
  Hardware is PQUICC with Fractional T1 CSU/DSU
  Description: North Hardin
  Internet address is 192.168.1.1/30
  MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec,
     reliability 255/255, txload 16/255, rxload 114/255
  Encapsulation HDLC, 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 never
  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0
  Queueing strategy: Class-based queueing
  Output queue: 0/1000/64/0 (size/max total/threshold/drops)
     Conversations  0/8/256 (active/max active/max total)
     Reserved Conversations 0/0 (allocated/max allocated)
     Available Bandwidth 902 kilobits/sec
  5 minute input rate 693000 bits/sec, 113 packets/sec
  5 minute output rate 101000 bits/sec, 93 packets/sec
     100090 packets input, 85201679 bytes, 0 no buffer
     Received 78 broadcasts, 0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
     77148 packets output, 11132856 bytes, 0 underruns
     0 output errors, 0 collisions, 1 interface resets
     0 output buffer failures, 0 output buffers swapped out
     1 carrier transitions
     DCD=up  DSR=up  DTR=up  RTS=up  CTS=up
 
Serial1 is up, line protocol is up
  Hardware is PQUICC with Fractional T1 CSU/DSU
  Description: Crowne Pointe
  Internet address is 192.168.1.5/30
  MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec,
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation HDLC, loopback not set
  Keepalive set (10 sec)
  Last input 00:00:00, 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: 0
  Queueing strategy: Class-based queueing
  Output queue: 0/1000/64/0 (size/max total/threshold/drops)
     Conversations  0/6/256 (active/max active/max total)
     Reserved Conversations 0/0 (allocated/max allocated)
     Available Bandwidth 902 kilobits/sec
  5 minute input rate 5000 bits/sec, 6 packets/sec
  5 minute output rate 7000 bits/sec, 5 packets/sec
     8945 packets input, 1560233 bytes, 0 no buffer
     Received 78 broadcasts, 0 runts, 0 giants, 0 throttles
     9 input errors, 0 CRC, 4 frame, 0 overrun, 0 ignored, 5 abort
     9993 packets output, 3832549 bytes, 0 underruns
     0 output errors, 0 collisions, 1 interface resets
     0 output buffer failures, 0 output buffers swapped out
     1 carrier transitions
     DCD=up  DSR=up  DTR=up  RTS=up  CTS=up
 
Main1721#
 
 
B side show int
 
Crowne1720#show int
FastEthernet0 is up, line protocol is up
  Hardware is PQUICC_FEC, address is 0002.1761.1720 (bia 0002.1761.1720)
  Internet address is 10.1.2.1/24
  MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation ARPA, loopback not set
  Keepalive set (10 sec)
  Full-duplex, 100Mb/s, 100BaseTX/FX
  ARP type: ARPA, ARP Timeout 04:00:00
  Last input 00:00:00, 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: 0
  Queueing strategy: fifo
  Output queue: 0/40 (size/max)
  5 minute input rate 8000 bits/sec, 8 packets/sec
  5 minute output rate 9000 bits/sec, 9 packets/sec
     200922 packets input, 31120526 bytes
     Received 3444 broadcasts, 0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
     0 watchdog
     0 input packets with dribble condition detected
     224362 packets output, 108007858 bytes, 0 underruns
     0 output errors, 0 collisions, 3 interface resets
     0 babbles, 0 late collision, 0 deferred
     0 lost carrier, 0 no carrier
     0 output buffer failures, 0 output buffers swapped out
Serial0 is up, line protocol is up
  Hardware is PQUICC with Fractional T1 CSU/DSU
  Internet address is 192.168.1.6/30
  MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec,
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation HDLC, loopback not set
  Keepalive set (10 sec)
  Last input 00:00:00, 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: 4
  Queueing strategy: Class-based queueing
  Output queue: 0/1000/64/0 (size/max total/threshold/drops)
     Conversations  0/8/256 (active/max active/max total)
     Reserved Conversations 0/0 (allocated/max allocated)
     Available Bandwidth 902 kilobits/sec
  5 minute input rate 10000 bits/sec, 11 packets/sec
  5 minute output rate 10000 bits/sec, 9 packets/sec
     251635 packets input, 129995160 bytes, 0 no buffer
     Received 1077 broadcasts, 0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
     229206 packets output, 52913704 bytes, 0 underruns
     0 output errors, 0 collisions, 10 interface resets
     0 output buffer failures, 0 output buffers swapped out
     15 carrier transitions
     DCD=up  DSR=up  DTR=up  RTS=up  CTS=up
 
Crowne1720#

                                  
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Asked On
2009-01-14 at 09:49:50ID24051740
Tags

Cicso Router Debugging

Topics

Frame Relay

,

Cisco PIX Firewall

Participating Experts
1
Points
500
Comments
6

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Answers

 

by: equalizerPosted on 2009-01-14 at 10:30:45ID: 23375793

Serial Input error is related with Layer 2. IF your router isnot connected backtoback you cannot see output error message in remote router. L2 means some wrong frames are coimg to serial1 from your operator F/R switch. Serial input errors are also not related with your fastethernet collision.

you can debug F/R layer opearation below commands.

 - debug frame-relay ipc
 - debug frame-relay lmi
 - debug frame-relay packet

 

by: ibtayaPosted on 2009-01-14 at 10:55:44ID: 23376067

thanks for the post, a little clarification for my unintelligence.  F/R switch, would this be ATT?  They are providing the T.

Also, what would you suggest I do to test the "high collision or drop rate" error that's coming from the switch for the port that FA0 is plugged into?

Syslog is showing a bunch of S0 changed state to up, then down, then up ....

It's also showing a bunch of S0 is up: new adjancency.

Thanks for your knowledge.

 

by: equalizerPosted on 2009-01-14 at 11:12:10ID: 23376268

As i see from your comments, you have layer2 problem. if s0 is flapping it is loosing connecitvity. problem can happen  F//R modem or line quality.

 

by: ibtayaPosted on 2009-01-14 at 11:15:27ID: 23376313

so it's either the hardware itself or a problem with ATT, sorry for the numbing questions, I'm new

 

by: equalizerPosted on 2009-01-14 at 11:17:29ID: 23376346

yes. most probably it looks ATT line problem.

 

by: ibtayaPosted on 2009-01-14 at 11:20:48ID: 23376380

thanks, much respect!!!

20120131-EE-VQP-002

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