11-04-2002 02:12 AM - edited 03-02-2019 02:36 AM
Hello,
3550 has got lot of collisions on ports.
3,4 ports have got this message :
Error Message ETHCNTR-3-HALF_DUX_COLISION_EXCEED_THRESHOLD: Collision at [chars] exceed threshold. Consider as loop-back.
like show on this url http://www.cisco.com/en/US/products/hw/switches/ps646/products_system_message_guide_chapter09186a008007ef4c.html#xtocid20365
and the port pass in shutdown mode.
To reactivate the port, we pass the command : "no shutdown".
Follow informations about one of trouble ports.
FastEthernet0/6 is up, line protocol is up
Hardware is Fast Ethernet, address is 0009.43e3.e906 (bia 0009.43e3.e906)
Description: Vers Hub_10_12_5_126_LAN
MTU 1500 bytes, BW 10000 Kbit, DLY 1000 usec,
reliability 255/255, txload 4/255, rxload 1/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Half-duplex, 10Mb/s
input flow-control is off, output flow-control is off
ARP type: ARPA, ARP Timeout 04:00:00
Last input never, output 00:00:00, output hang never
Last clearing of "show interface" counters 6d23h
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 0 bits/sec, 0 packets/sec
5 minute output rate 170000 bits/sec, 39 packets/sec
2896528 packets input, 1608516928 bytes, 0 no buffer
Received 39267 broadcasts, 0 runts, 0 giants, 0 throttles
1237 input errors, 1237 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 468 multicast, 0 pause input
0 input packets with dribble condition detected
16467500 packets output, 3535857678 bytes, 6277 underruns
4 output errors, 670428 collisions, 2 interface resets
0 babbles, 0 late collision, 168682 deferred
0 lost carrier, 0 no carrier, 0 PAUSE output
6277 output buffer failures, 0 output buffers swapped out
We can't reduce this collisions on this ports and we search a solution to avoid the passage on shutdown mode.
Has someone got a idea ?
Thank You.
11-04-2002 05:23 AM
First check the configuration of the device that is plugged into the port with exdessive collisons. Make sure it and the ports are set to autodetect speed and duplex. If not, change them both and reboot the device.
If this doesn't take care of the problem, take the device that is plugged into the port with excessive collisions and move it to a different port. If the collisions follow the device, replace the NIC in the device.
11-04-2002 07:08 AM
Hello John and thank You for your answer.
The speed and the duplex are forced to 10 and half in both sides.
Behind the 3550, there are 3 Hub Cascade 3-Com.
We have already move the port into another but this problem persist.
The problem is present on 3,4 ports aleatory.
We can have no problem (no shutdown) during 1 week and many shutdown on this 3550 during
short time.
I hope that i'm explicit =)
All ideas are welcome.
11-04-2002 07:30 AM
If you can't reduce the high number of collisions that you are experiencing on your Hub stack, my recommendation would be to break the 3Com stack. Uplink each of the hubs individually to a seperate port on the switch and eliminate the problem.
Hope it helps.
Bob
11-04-2002 07:57 AM
Hello Bob and thank you for your help,
It's not really possible to break down the stacked Hub 3Com
because there is no port available on the 3550 :|.
We search a solution which is the cheapest.
All advices are excepts.
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