[c-nsp] Dumb question of the day (on vlans)

[Marco van den Bovenkamp]

Security Admin (NetSec) wrote:

> Been having trouble setting up vlans on a Cisco 2950 switch.  I add one using the typical method via CLI:
> 
> Int vlan x
> Ip address 192.xxx.yyy.zzz 255.255.255.240
> No ip route-cache
> No shut
> 
> The CLI screen notes that the vlan is up. As soon as I add another vlan (vlan y) vlan y will come up but vlan x will administratively go down.  This process is repeated each time I add a vlan so that only one vlan is up at any one time, which is the last vlan created.  Please note that I have vlan 1 shutdown and it is not used.
> 
> Question is how do I keep all my vlans up simultaneously?

You don't, at least not like that. A 2950 is a pure L2 switch, and it 
can have only one IP address at the same time, purely for management 
purposes. So as soon as you assign an IP adress to a VLAN interface (the 
'int vlan xxx' command), the other one will go admin down.

You create L2 VLANs with the 'vlan xxx' command.

		Regards,

			Marco.