Interesting. Have you tried to make the connects
regular ports (not trunks) and disable all autoneg
(trunk, port channel, duplex, speed, etc). I realize
that you may not be able to do a non-trunk test easily
but if you can that would narrow the problem down
further to a trunking issue or not. I ran into a
problem with trunking AND port-channel on a 35xx in
the past which was hardware. On the switch console are
you getting errors, warnings, etc?
As a further test, you could connect a switch port to
another switch and see if CRC errors occur between 2
switches. Same test for router.
If only certain 3640's and 35xx XLs are reporting the
CRC errors have you tried swapping modules, the entire
switch, etc to see if CRC errors follow the
switch/router or stay at that site?
Just some ideas to narrow it down...
--- Rick Thompson <[EMAIL PROTECTED]> wrote:
> 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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