[c-nsp] Cisco 7500, output errors on FastEth interfaces

[Tantsura, Jeff]

I'd definitely try to change duplex settings.

What Are Collisions?

A collision is the mechanism used by Ethernet to control access and allocate
shared bandwidth among stations that want to transmit at the same time on a
shared medium. Because the medium is shared, a mechanism must exist where
two stations can detect that they want to transmit at the same time. This
mechanism is collision detection.

--
Jeff Tantsura  CCIE# 11416
Senior IP Network Engineer


-----Original Message-----
From: Ray Van Dolson [mailto:rayvd at digitalpath.net] 
Sent: 31 August 2005 16:47
To: cisco-nsp at puck.nether.net
Subject: Re: [c-nsp] Cisco 7500, output errors on FastEth interfaces

On Wed, Aug 31, 2005 at 09:55:31AM +0200, Kristian Larsson wrote:
> > Things seem to be working OK, but now I am beginning to see output
errors on
> > the FastEthernet interfaces.  I'm wondering if this is due to the cef
entry I
> > enabled above.
>
> What kind of output errors?
> Please give us a 'show interface FastEthernet 5/1/0' (or the appropriate
interface).

FastEthernet5/1/0 is up, line protocol is up 
  Hardware is cyBus FastEthernet Interface, address is 0001.63c3.b0a8 (bia
0001.63c3.b0a8)
  Internet address is xxxx
  MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec, 
     reliability 255/255, txload 5/255, rxload 5/255
  Encapsulation ARPA, loopback not set
  Keepalive set (10 sec)
  Half-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: 1/100/0/233195 (size/max/drops/flushes); Total output drops:
0
  Queueing strategy: fifo
  Output queue: 0/40 (size/max)
  5 minute input rate 1966000 bits/sec, 718 packets/sec
  5 minute output rate 2258000 bits/sec, 724 packets/sec
     31934886 packets input, 3273516886 bytes, 0 no buffer
     Received 9708 broadcasts, 0 runts, 0 giants, 0 throttles
     0 input errors, 0 CRC, 0 frame, 0 overrun, 1 ignored
     0 watchdog
     0 input packets with dribble condition detected
     33291597 packets output, 2950886957 bytes, 0 underruns
     454589 output errors, 331949 collisions, 1 interface resets
     0 babbles, 0 late collision, 0 deferred
     4 lost carrier, 0 no carrier
     0 output buffer failures, 0 output buffers swapped out

FastEthernet5/0/0 is up, line protocol is up 
  Hardware is cyBus FastEthernet Interface, address is 0001.63c3.b0a0 (bia
0001.63c3.b0a0)
  Internet address is xxxx
  MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec, 
     reliability 252/255, txload 21/255, rxload 6/255
  Encapsulation ARPA, loopback not set
  Keepalive set (10 sec)
  Half-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: 0/100/510/352338 (size/max/drops/flushes); Total output
drops: 0
  Queueing strategy: fifo
  Output queue: 0/40 (size/max)
  5 minute input rate 2447000 bits/sec, 1083 packets/sec
  5 minute output rate 8313000 bits/sec, 1295 packets/sec
     69765527 packets input, 1693213383 bytes, 0 no buffer
     Received 176595 broadcasts, 0 runts, 0 giants, 10 throttles
     0 input errors, 0 CRC, 1 frame, 0 overrun, 6 ignored
     0 watchdog
     0 input packets with dribble condition detected
     86253000 packets output, 3280376438 bytes, 0 underruns
     1852550 output errors, 1153144 collisions, 1 interface resets
     0 babbles, 0 late collision, 0 deferred
     4 lost carrier, 0 no carrier
     0 output buffer failures, 0 output buffers swapped out

> > interface FastEthernet5/1/0
> >  ip address XX.XXX.XXX.1 255.255.255.0
> >  ip access-group 182 in
> >  no ip proxy-arp
> >  no ip mroute-cache
> >  half-duplex
> >  hold-queue 100 in
> Why half-duplex? This could cause collisions.

>From reading other posts, looks like I may need to hard set this on the
switch
to match.

Thanks for the reply!

Ray
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