====== Cisco - Router - Assign an IP address ======

===== Check state of the available interfaces =====

==== In Privileged EXEC mode ====


<code bash>
show ip interface brief
</code>

----

==== In Global config mode ====

<code bash>
do show ip interface brief
</code>

----

===== Configure Interface =====

Configure FastEthernet0/0:

<code bash>
interface FastEthernet 0/0
ip address 192.168.1.1 255.255.255.0
no shut
</code>

returns:

<code bash>
#
%LINK-5-CHANGED: Interface FastEthernet0/0, changed state to up
</code>

<WRAP info>
**NOTE:**

  * **interface FastEthernet 0/0**:  Enters configuration mode of port FastEthernet 0/0 (FE0/0).
  * **ip address**:  Adds IP address to port FE0/0.
  * **no shut**.  (or **no shutdown**) brings FE0/0 from down (offline) state to up (online).

</WRAP>


----

===== Check port configuration again =====

<code bash>
do show ip interface brief
</code>

<WRAP info>
**NOTE:**  This should show the Port is up with address that was assigned.
</WRAP>

----

===== Remove IP address from the interface =====

<code bash>
interface fastethernet0/0
no ip address
</code>

----

===== Bring down (offline) the interface =====

<code bash>
shutdown
</code>