Problem Configuring Access Mode on an Interface on a Catalyst 3500XL

I want to configure several FastEthernet interfaces on a Catalyst
3500XL switch so they will not trunk. I used the following command:

conf t
int fa0/1
switchport mode access

It takes the command o.k. but when I do a sh run it does not show that
the interface is in access mode. Moreover, when I connect another
switch to fa0/1 with at cross-over cable, it trunks.

When I use the same command on a Catalyst 2950 switch, this is what I
see when I do a sh run:

interface FastEthernet0/1
switchport mode access

Am I missing something?

Thanks in advance.

 

You need to turn off Dynamic Trunking Protocol

int fa0/1
switchport mode access
switchport nonegotiate

 

I tried it but there is no such command as switchport nonegotiate.
The only commands under switchport are:
access
mode
multi
priority
trunk
voice

I tried the following command in interface config mode:

no negotiation auto

It returns the message: This command is not supported for
FastEthernet0/1

 

to disable trunking on a 3500XL, try the command

no switchport mode

 

I already tried that one. It doesn't seem to do anything. I can
still plug another switch into the port and it lights up.

 

In the message
<> tman
wrote:

| > to disable trunking on a 3500XL, try the command
| >
| > no switchport mode
|
| I already tried that one. It doesn't seem to do anything. I can
| still plug another switch into the port and it lights up.

According to this:
http://www.ciscopress.com/articles/article.asp?p=29803&seqNum=3

"Cisco 2950 and 3500XL switches do not support DTP and are always in a
mode similar to nonegotiate. If you turn trunking on for one of these
devices, it will not negotiate with the other end of the link and
requires that the other link be configured to on or nonegotiate."