>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").
More accurately, you have a /25 subnet. Classful is dead.
>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.
Why? What's wrong with subnetting? Classful or classless, you still
have subnetting when you have IP.
>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.
Probably a difference in duplex. But is there a problem?
>
>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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