Switch collision errors! Need to fix.

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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wolf2008Asked:
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debuggerauCommented:
have you tried setting the interfaces to full duplex?
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wolf2008Author Commented:
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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debuggerauCommented:
any switches in between? Otherwise you'll need to raise it with the ISP..
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wolf2008Author Commented:
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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debuggerauCommented:
I don't know of that condition.

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Don JohnstonInstructorCommented:
>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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debuggerauCommented:
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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JanScCommented:
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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wolf2008Author Commented:
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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Don JohnstonInstructorCommented:
What exactly is the fa0/47 port connected to?
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wolf2008Author Commented:
fa0/5 port of the router w/ a CAT5e straight cable..
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wolf2008Author Commented:
Is the Cisco 3400 ME a layer 3 switch.... ? Should I be using a crossover?
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Don JohnstonInstructorCommented:
Please post the output of a "show int f0/5" from the router.
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wolf2008Author Commented:
Wish I could. That's where the demark begins. I don't have access.
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Don JohnstonInstructorCommented:
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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wolf2008Author Commented:
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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