Yes. It's happened with me before.

--
Jordan Mills - J Mills Consulting
Zero Administration Networks for Small Businesses
http://www.jordanmills.com/
..
"Jay [Work]" wrote in message
...
We are noticing a long delay in the PC gettig an IP address. We usually
have to wait at logon at least 30seconds before we can try to logon. When
we logon locally or cached, we can't see network resources until 20-30
seconds. I heard that spanning tree enabled on the switches can cause
this.
Could this be the reason? Please let me know.
thanks