duficy
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troubleshooting high number of collisions on cisco 3640
I'm noticing a high number of collisions and deferred packets on my ETH connection Nothing has changed on my network. I have about 30 boxes connected to my 3640. One guy is saying that his downloads are very slow but
his uploads are fast. This seems odd but it got me looking at the router.
What should I be looking for. Does this asymetric complaint seem legitimate.
Hardware is AmdP2, address is 0010.7b5a.8141 (bia 0010.7b5a.8141)
Internet address is 63.237.136.1/24
MTU 1500 bytes, BW 10000 Kbit, DLY 1000 usec, rely 255/255, load 22/255
Encapsulation ARPA, loopback not set, keepalive set (10 sec)
ARP type: ARPA, ARP Timeout 00:06:00
Last input 00:00:00, output 00:00:00, output hang never
Last clearing of "show interface" counters 00:03:14
Queueing strategy: fifo
Output queue 0/40, 0 drops; input queue 0/75, 0 drops
5 minute input rate 830000 bits/sec, 237 packets/sec
5 minute output rate 896000 bits/sec, 224 packets/sec
42825 packets input, 16824308 bytes, 0 no buffer
Received 284 broadcasts, 0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
0 input packets with dribble condition detected
42083 packets output, 20129824 bytes, 0 underruns
0 output errors, 2408 collisions, 0 interface resets
^^^^^^^^^^^^^^^
0 babbles, 0 late collision, 1425 deferred
^^^^^^^^^^^^^
0 lost carrier, 0 no carrier
0 output buffer failures, 0 output buffers swapped out
his uploads are fast. This seems odd but it got me looking at the router.
What should I be looking for. Does this asymetric complaint seem legitimate.
Hardware is AmdP2, address is 0010.7b5a.8141 (bia 0010.7b5a.8141)
Internet address is 63.237.136.1/24
MTU 1500 bytes, BW 10000 Kbit, DLY 1000 usec, rely 255/255, load 22/255
Encapsulation ARPA, loopback not set, keepalive set (10 sec)
ARP type: ARPA, ARP Timeout 00:06:00
Last input 00:00:00, output 00:00:00, output hang never
Last clearing of "show interface" counters 00:03:14
Queueing strategy: fifo
Output queue 0/40, 0 drops; input queue 0/75, 0 drops
5 minute input rate 830000 bits/sec, 237 packets/sec
5 minute output rate 896000 bits/sec, 224 packets/sec
42825 packets input, 16824308 bytes, 0 no buffer
Received 284 broadcasts, 0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
0 input packets with dribble condition detected
42083 packets output, 20129824 bytes, 0 underruns
0 output errors, 2408 collisions, 0 interface resets
^^^^^^^^^^^^^^^
0 babbles, 0 late collision, 1425 deferred
^^^^^^^^^^^^^
0 lost carrier, 0 no carrier
0 output buffer failures, 0 output buffers swapped out
As far as the slow downloads go, do you have any access-lists / filters, or a firewall in the mix?
ASKER
the router is plugged into a switch
If it is plugged into a switch, then there should never be any collisions. Try a different switch port, make sure there is no speed/duplex mismatch, and try a new patch cable.
ASKER
how do I display/change duplex settings
From interface configuration mode:
speed 100 (or speed 10)
duplex auto|full|half
speed 100 (or speed 10)
duplex auto|full|half
Depends on the switch...
It should be set to 10/half because your 3640 only has a 10Mb port:
MTU 1500 bytes, BW 10000 Kbit,
MTU 1500 bytes, BW 10000 Kbit,
ASKER
SORRY I WAS GIVEN THE WRONG INFO.
It turns out it's a 2500 router. We plugged the router into a 10 megabyte hub and a laptop into the hub. We tried different ports and different cables. Still getting SLOW downloads but FAST uploads.
Ethernet0 is up, line protocol is up
Hardware is Lance, address is 0000.0c3f.2937 (bia 0000.0c3f.2937)
Internet address is 209.113.196.1/24
MTU 1500 bytes, BW 10000 Kbit, DLY 1000 usec, rely 255/255, load 1/255
Encapsulation ARPA, loopback not set, keepalive set (10 sec)
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:22, output 00:00:00, output hang never
Last clearing of "show interface" counters never
Queueing strategy: fifo
Output queue 0/40, 0 drops; input queue 0/75, 0 drops
5 minute input rate 32000 bits/sec, 2 packets/sec
5 minute output rate 27000 bits/sec, 3 packets/sec
3452 packets input, 2678973 bytes, 0 no buffer
Received 21 broadcasts, 0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
0 input packets with dribble condition detected
3437 packets output, 2663292 bytes, 0 underruns
0 output errors, 9 collisions, 5 interface resets
0 babbles, 0 late collision, 17 deferred
0 lost carrier, 0 no carrier
0 output buffer failures, 0 output buffers swapped out
It turns out it's a 2500 router. We plugged the router into a 10 megabyte hub and a laptop into the hub. We tried different ports and different cables. Still getting SLOW downloads but FAST uploads.
Ethernet0 is up, line protocol is up
Hardware is Lance, address is 0000.0c3f.2937 (bia 0000.0c3f.2937)
Internet address is 209.113.196.1/24
MTU 1500 bytes, BW 10000 Kbit, DLY 1000 usec, rely 255/255, load 1/255
Encapsulation ARPA, loopback not set, keepalive set (10 sec)
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:22, output 00:00:00, output hang never
Last clearing of "show interface" counters never
Queueing strategy: fifo
Output queue 0/40, 0 drops; input queue 0/75, 0 drops
5 minute input rate 32000 bits/sec, 2 packets/sec
5 minute output rate 27000 bits/sec, 3 packets/sec
3452 packets input, 2678973 bytes, 0 no buffer
Received 21 broadcasts, 0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored, 0 abort
0 input packets with dribble condition detected
3437 packets output, 2663292 bytes, 0 underruns
0 output errors, 9 collisions, 5 interface resets
0 babbles, 0 late collision, 17 deferred
0 lost carrier, 0 no carrier
0 output buffer failures, 0 output buffers swapped out
ASKER CERTIFIED SOLUTION
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ASKER
Thanks, I will look elsewhere. I suspect the problem could be the line.
The collisions indicates that the router is plugged into a hub rather than a switch. Switches stop collisions.