To my knowledge, if both devices are ISL capable, it will NOT produce a CRC
error- even though
the packet size is above 1500 bytes. It's smart enough to know why :)
-----Original Message-----
From: Tony van Ree [mailto:[EMAIL PROTECTED]]
Sent: Tuesday, December 19, 2000 3:19 PM
To: Rick Thompson; [EMAIL PROTECTED]
Subject: Re: trunking problem
Hi,
I'm not sure if this helps but running ISL on the trunk ports increases the
the packet size beyond 1500 bytes. This can produce a CRC error. Whilst
the error exists however the data still goes through ok.
You can check this by doing an extended ping and lifting the packet size to
beyond 1486 bytes.
Teunis,
Hobart, Tasmania
Australia
On Monday, December 18, 2000 at 09:49:28 PM, Rick Thompson 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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