Connecting 2950 to existing LAN

I recently purchased a WS-C2950T-24 to add to my existing network. I have mirrored the configuration of other 2950 switches in other offices (with exception of name and subnet info that differs between sites). The existing LAN in this office is comprised of 4 cisco WS-C2924-XL switches. I can connect to all 4 of the 2924 switches but not to the 2950. Any known issues of talking between the two different types of switches?

Its not a good practice to enable portfast on all the interfaces. It should be done only when the connection is terminated to an end host.
I think your problem is because of the trunk between the 2924XL and the 2950. The 2924 switch supports both dot1q and ISL trunk encapsulation whereas the 2950 supports only dot1q
try this
on the 2924XL port connecting to 2950
interface fa 0/24
switchport trunk encapsulation dot1q
switchport mode trunk
on the 2950 port conencting to 2924XL
interface fa 0/24
switchport mode trunk
HTH, rate if it does
Narayan

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