First off, I'd say you are dealing with a poor design. You're most likely
dealing with a bandwidth issue on that 10 Meg link. Check the show
interface @ the 3600 (I think R1 router). I would venture to say the
broadcasts & valid traffic together are causing the 10/half to saturate. I
wish I wasn't knee deep in OSPF, or I'm sure I could conger a few design
ideas (I'm sure the list will help ;-). I know you're looking @ a candidate
for clusters & ISL. It wouldn't hurt to implement a better IP addressing
scheme, even 10.0.0.0's (but that's not the issue here). I had a similar
problem months back, a fellow had installed a 6509 using a 10/ half
connection to a 7507 for routing between VLAN's & as the access link out.
What a waste of expensive equipment. His only reply was that it worked-
sorta...
I'll watch this thread for your progress
Phil
----- Original Message -----
From: "Jim McDowell" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Tuesday, March 27, 2001 6:00 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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