We have recently migrated our management vlan off vlan 1, to a new dedicated vlan. Our network consists of 2 6500 at the core, and the rest 3560, snd 3548 all running L2. Some of the switches have vlan 1 admin down, and some admin up, is it necessary to still have vlan 1 up or down on all switches?
L2 only devices like a 2950 can have only one active vlan so on those platforms you will see only the new management vlan SVI up/up and the SVI for Vlan1 will be admin down.
Some switches that actually have some L3 capabilities can have both SVI up/up.
My suggestion is to shut down the SVI of Vlan1 manually on devices that have it still up/up.
The main reason for moving away from vlan1 as management vlan are security reasons: leaving an alive L3 interface in vlan1 would expose the switches to some threats as it was before the migration.
Hope to help