Jovan StosicAs you may know there are layer 2 and layer 3 switches. A layer 2 switch only does layer 2 fowarding, as such it doesn’t have any additional ip interfaces. On a layer 2 switch the ip address is instead assigned to the vlan interface:
config t
interface vlan 1
ip address 192.168.1.1 255.255.255.0
* Note on a L2 switch you can assign an ip to any vlan you want (vlan 1, vlan 2, vlan 4000). You can only assign an ip address to one vlan at a time on a l2 switch. If you configured an ip on a vlan and then try to assign an ip to another vlan…the switch will shut down the first vlan and bring up the second vlan interface)*
On a L3 switch you can have multiple ip interfances. Unlike a L2 switch, an L3 switch can have static ip addresses on multiple vlan interfaces (configuration is the same as the above example). In addtion unlike L2 swithes a L3 switch can have a static ip address assigned to any one of its fastethernet (fa0/1) or gig ethernet ports (gi0/1).
Config t
int fa0/1
ip address 192.168.1.1 255.255.255.0
description *** Assigning an ip address to a physical fast ethernet port on the switch***
int vlan 1
ip address 192.168.2.1 255.255.255.0
description *** Assigning an ip address to the virtual (vlan) interface on the switch ***
int vlan 2
ip address 192.168.3.1 255.255.255.0
description *** Assigning an ip address to another virtual (vlan) interface on the switch ***
Note that although you can assign multiple ip addresses on a L3 switche’s physical (e.g. fa0/1 fa0/2 gi0/1) or virtual (vlan 1, vlan 3, vlan 3000, or a loopback lo1, lo2,lo3), all of the ip address must be in different networks. If subnetting is used, the interfaces belonging to the same switch must have a different subnet mask.
Example
int fa0/1
ip address 192.168.1.1 255.255.255.252
description *** This interface is on the 192.168.1.0/30 network ***
int fa0/2
ip address 192.168.1.5 255.255.255.252
description *** This interface is on the 192.168.1.4/30 network***
int vlan 1
ip address 192.168.9 255.255.255.252
description *** This interface is on the 192.168.1.8/30 network ***
HTH
Source: how to assign static IP on a switch – 14861 – The Cisco Learning Network