everything else notwithstanding, I would nail the duplex setting.
I think I heard from this list - autonegotiate... "auto" means "ought not
to"
I just finished up a long lab experiment where I had problems with our ISP.
In the end the ISP had the duplex setting wrong on their eqpt. They didn't
tell me if it was autonegotiate or just the wrong setting but I get rid of
all autonegotiation now unless the circuit doesn't work without it. (haven't
found one of those yet)
Kevin Wigle
----- Original Message -----
From: "Jim McDowell" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Tuesday, March 27, 2001 2:00 PM
Subject: CRC errors on Catalyst 3500 XL port
> Hi,
>
> I have a 3640 ("router1") with IOS v11.2 which is routing between IP
subnets
> (class "c" with a one bit subnet mask - using "IP subnet-zero"). There
are
> two Ethernet ports on the router, each is connected to a separate Catalyst
> 3500 XL switch. The two switch ports are hard set to 10 MBS, duplex
> autonegotiate, spanning-tree on, portfast on. I am seeing collisions and
> crc errors on the switch ports that are connected to "router1". The
> remainder of the switch ports ( with the exception of a few ports which
I'll
> explain shortly ) are connected to 100 MBS fastethernet desktops and don't
> show any collisions...I understand why.
>
> I also have another 3640 ("router2") connected to the same switches, in
the
> same manner...for redundancy, I'm told. There are a couple of other 3500
XL
> switches cascaded from these...to accommodate the number users. The LAN
> size is about 125 nodes with about equal number of nodes connected to each
> subnet. I'm new here...I have recommended getting rid of the subnetting
> scheme in favor of a classful LAN. Anyway, the switch ports that are
> connected to "router2" don't show any collisions/crc errors.
> This all started 2 weeks ago. The network has been designed this way for
> about a year.
>
> In short, I can't determine whether routing loops are causing the
collisions
> (and if so, why only on "router1"), or whether there's a port
configuration
> mismatch between "router1"s Ethernet ports and the switch. Or, maybe some
> piece of hardware has just failed? Any suggestions are welcome.
>
>
> Jim McDowell
> Cisco Certified Network Professional
>
> Network Administrator
> Copley Information Systems
> 858.729.8028
>
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