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Switch collision errors! Need to fix.

Posted on 2009-07-07
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Last Modified: 2012-05-07
We have a PPP connection between are campuses w/ ISP Cisco 3400 routers sitting on both sides. The network is connected but is recieving collision errors on both uplinks to the switches (3560's). The duplex and speed to set to auto, and gets half/10MB's. (There is a 10MB line between the buildings.)

ISP confirms 10MB connection and full duplex. However, when I hardcode the interface is changes to down, down and the activity lights go black.

I need to clean up the connection and have it collision free.
Thanks.


FastEthernet0/47 is up, line protocol is up (connected)

  Hardware is Fast Ethernet, address is 0022.0c4a.ea33 (bia 0022.0c4a.ea33)

  Description: (To Cisco 3400 Router port 1)

  MTU 1500 bytes, BW 10000 Kbit, DLY 1000 usec,

     reliability 255/255, txload 1/255, rxload 3/255

  Encapsulation ARPA, loopback not set

  Keepalive set (10 sec)

  Half-duplex, 10Mb/s, media type is 10/100BaseTX

  input flow-control is off, output flow-control is unsupported

  ARP type: ARPA, ARP Timeout 04:00:00

  Last input 00:00:00, output 00:00:01, 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 126000 bits/sec, 2 packets/sec

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

     9986392 packets input, 8099764936 bytes, 0 no buffer

     Received 1296339 broadcasts (907560 multicasts)

     0 runts, 0 giants, 0 throttles

     1 input errors, 1 CRC, 0 frame, 0 overrun, 0 ignored

     0 watchdog, 907561 multicast, 0 pause input

     0 input packets with dribble condition detected

     10582982 packets output, 5333970718 bytes, 0 underruns

     0 output errors, 368142 collisions, 1 interface resets

     0 babbles, 75356 late collision, 0 deferred

     0 lost carrier, 0 no carrier, 0 PAUSE output

     0 output buffer failures, 0 output buffers swapped out

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Question by:wolf2008
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by:debuggerau
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have you tried setting the interfaces to full duplex?
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by:wolf2008
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Yes, when I hardcode the switch to full/10MB the switch interface goes down/down.

I don't have access to the router, ISP confirmed full/10MB.
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by:debuggerau
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any switches in between? Otherwise you'll need to raise it with the ISP..
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by:wolf2008
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No.. Just

switch -> router --> ISP <-- router <- switch

Both interfaces are assigned as trunks. That wouldn't have anything to do with the hardcoding of full/10MB correct?
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by:debuggerau
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I don't know of that condition.

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by:Don Johnston
Don Johnston earned 500 total points
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>75356 late collisions

This is the result of a duplex mismatch (or a cable length beyond spec).

The device that is connected to fa0/47 is full duplex.
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LVL 23

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by:debuggerau
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how can you tell?

Better find out what sort of connection it is too, if it is infrared, radio, or laser, the trouble may be external..
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Expert Comment

by:JanSc
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What kind of router does ISP use, or is there a hub between ISP and your stuff?
Might explain the collisions.
Some providers use cisco 828H, where H stands for hub. This can't be full-duplex.
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by:wolf2008
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Each campus has a Cisco 3400 ME router.

We had the ISP hardcode auto/auto and it didn't go up/up with our switch setup to auto/auto...

There's  fiber running into each router.
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Expert Comment

by:Don Johnston
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What exactly is the fa0/47 port connected to?
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by:wolf2008
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fa0/5 port of the router w/ a CAT5e straight cable..
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by:wolf2008
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Is the Cisco 3400 ME a layer 3 switch.... ? Should I be using a crossover?
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by:Don Johnston
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Please post the output of a "show int f0/5" from the router.
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by:wolf2008
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Wish I could. That's where the demark begins. I don't have access.
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Don Johnston earned 500 total points
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I'm not familiar with that product. However, multilayer switch to multilayer switch usually requires a crossover cable.

In this case, you're going to have to involve the provider.
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by:wolf2008
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The Cisco 3400 ME is a layer 3 switch and needs a cross-over connected to the Cisco 3560 switch. Hardcoded 10MB/Full no more collisions!!!
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