DHCP on CAT4006 running IOS

[tgconsulting]

Hello,

I have a CAT4006 with SUP 3 running IOS (not CatOS). I upgraded the IOS from cat4000-is-mz.121-19.EW.bin to cat4000-i9s-mz.122-20.EWA.bin

After the upgrade the 4006 switch stopped issuing dhcp addresses. I recreated the IP dhcp pool without success. My only command change was "boot system flash: cat4000-i9s-mz.122-20.EWA.bin"

Any ideas why the upgrade stopped the DHCP from issuing IP addresses?

Thanks for your help and suggestions.

[glen.grant]

Make sure that the upgrade didn't modify the spantree portfast settings on your user ports . We are using that version and haven't seen any issues, though we do not use the switch to issue addresses . We are using Sup II pluses though .

[tgconsulting]

Glen,

Thanks for the quick response. This switch has a SUP III (WS-X4014)

The new IOS did add "desirable" after one of the commands. At the moment I do not remember if it was spantree portfast or switchport mode.

[tgconsulting]

Glen,

Looks like I remembered wrong. I checked the desirable was on the channel-group for both IOSes.

The running config was the same for both IOSes:

switchport access vlan 2

switchport mode access

spanning-tree portfast

Any ideas?