I've always considered it best practice to not put ports in desirable mode.  I like to clearly "state" what it is that i want them to do.  Try them all with switchport mode trunk instead.What are your ports 49 and 50?

Yes, that's the image mine had on it.System image file is "flash:c2900xl-c3h2s-mz.120-5.WC17.bin"If you have console access, I'd just set up a tftp server on your laptop and grab the new image from there.  You'll probably have to delete the current i...

I  recently set up a trunk between a 2924xl and 2950.  here is my sample config:2950:interface FastEthernet0/24 description dot1q trunk link to Lamson (S2 2924) on port fa0/23 switchport trunk native vlan 70 switchport trunk allowed vlan 10,20,30,70 ...