I am currently having the same problem right now with a 3640 trunking to a FE card in
a 2912MF. If you change to dotq do you see runt packets? The router interface does
not collect errors of any kind. TAC just sent me a new 2912. I will let you know if
I find anything.
Chuck Collins
CCNP
Your post isn't very clear as to exactly where you are seeing CRC errors -
is it just on the switch ports? Or is it on the router as well?
I've been having a similar problem with a Catalyst 1900. Its got a port
that reported a LOT of CRC and aligmnent errors. Absolutely abysmal file
transfer rates (if the files were able to be transferred at all). I swapped
cables between the PC and the switch port - no change in the error rates.
The NIC was definitely set to 10 Mbps half-duplex operation (as was the
switch port) so it wasn't a case of duplex or speed mismatch. I unplugged
the PC from the switch port, bypassed the switch plugging the PC directly to
a 3COM hub--the file transfer performance of the PC increased dramatically.
That was with a bare-bones switch configuration - no trunking, no
configuration of VLANs.
The switch doesn't show any problems during the POST with any of its
hardware... Other ports seem to be fine (but I haven't had time to test
every port on the switch).
In your case, two options come to mind:
1. See if you've got bad ports that are not being reported by the switch
diagnostics. Select ports on your switch that you are not receiving CRC
errors on - reconfigure the switch to use those ports as trunk ports (and
move your server to a port other than port 23). See if your problem
disappears...
2. If you've got a service contract, ask Cisco to send replacement hardware
and let them figure out the problem.
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of
Rick Thompson
Sent: December 18, 2000 10:49 PM
To: [EMAIL PROTECTED]
Subject: trunking problem
Let's see if anyone can figure this one out:
Running into an interesting problem with trunking. We
have multiple setups running this configuration and
running into CRC's on the trunk ports, and slow
transfer and corrupted files sent inbetween the vlans.
Currently we have had 2 ccie from cisco look at it
with no help, and TAC has been working it for 5 days
with no luck so far. We have 50 locations with this
setup and 6 of them are reporting corrupted files.
There is a 3640 router with 2FE and the switch is
either a 3524xl or 3548XL, all code, cards, memory and
flash are identical.
The 3640 is setup as follows:
interface FastEthernet0/1
no ip address
no cdp enable
speed 100
duplex full
no ip directed-broadcast
interface FastEthernet0/1.1
description Trusted Network
encapsulation isl 1
no ip directed-broadcast
no ip redirects
ip address x.x.x.1 255.255.255.128
interface FastEthernet0/1.2
description Display Network
encapsulation isl 2
no ip directed-broadcast
no ip redirects
ip address x.x.x.129 255.255.255.192
interface FastEthernet0/1.3
description untrusted Network
encapsulation isl 3
no ip directed-broadcast
no ip redirects
ip address x.x.x.193 255.255.255.192
The 3524XL or 3548XL is configured as follows:
interface fast ethernet 0/24
description router
speed 100
duplex full
switchport mode trunk
The CRC increment atleast 1 every 7 secs. The more
data that gets transfere, the worse it gets. We also
see CRC's on port 23 which is the server. I tried
switching from isl trunking to dotq and that appeared
to slow down the CRC, but that is it.
Anybody have any ideas?
Rick Thompson
CCNA, MCSE
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