I believe you have 2950 switch which is a pure layer 2 switch and the vlans which you are creating a layer 3 logical interface so layer 2 switch only support one active layer 3 interface at a time for management purpose and taht si the reason when you no shut second interface first one will go down.
What you need to do is either go to vlan database mode and create layer 2 vlans or you can do it from global config mode
I have a core 2950 SW that connected to a checkpoint FW, and a 2 cisco 2950 SWitces
i want to different networks,
so i connect 1st sw to the core, and the 2nd to the core to (without connecting the 2 new together, 1st will be 192.168.1.x and 2nd will be 192.168.2.x) and i will connect 1 port in the core SW to a dmz NIC in the cp fw. 192.168.2.x
and the existing port connected to the lan nic in 192.168.1.x
it's now so securly but less broadcast i think i have.
We are pleased to announce availability of Beta software for 16.6.3.
16.6.3 will be the second rebuild on the 16.6 release train targeted
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