= Configuring the NEC Switch =
Although configuring the NEC switch is pretty intuitive if you have worked with Cisco switches, some aspects of configuring them might require digging through the Japanese manuals to find. 
 
== Overview ==
All configuration steps assume privileged mode. [[BR]]
The configuration for the following topics are covered here:

 * Undoing configurations 
 * DHCP/BootP relay agent/IP helper

== Undoing Configurations ==
Most of the time, just adding the command `no` to the beginning of what you see when you do the command `show configuration` will suffice for undoing configurations, but occasionally you get some message that can be a tad cryptic. 
=== getting rid of telnet VLAN 4 ===
VLAN 4 was the result of initial telnet configs until we realized we wanted to use Network VLAN 1 for telnet purposes. It was made so that port 0/27 was assigned to VLAN 4 so you can telnet using that port. You get this error if you try to remove VLAN 4 straight up:  
{{{
(config)# no vlan 4
vlan : Can't delete this configuration referred by other configuration.
}}}
and you need to undo the configurations to port 0/27 that have to do with vlan 4 before you can get rid of it. 
{{{
!(config)# int gi 0/27
!(config-if)# sh
interface gigabitethernet 0/27
  switchport mode access
  switchport access vlan 4
!
!(config-if)# no sw acc vlan 4
!(config-if)# exit
!(config)# no vlan 4
!(config)# save
}}}

{{{
interface vlan 3
  ip address 192.168.5.5 255.255.255.0
  ip helper-address 192.168.5.1
!
(config-if)# no  ip address 192.168.5.5 255.255.255.0
interface : IP interface is not defined.
}}}

in above circumstance, type "no ip helper-address" at the CLI before trying to remove ip address.  


== Command `ppupdate` for updating firmware, not actually needed (6/15) ==
The manual specified the command `ppupdate` for updating the firmware. This command copies new firmware (i.e. downloaded with ftp) on to the switch's flash memory. parameters usable: 

`ppupdate [test][no-display][-f][no-reload]<file name>`   

 * `test` - only tests firmware, but doesn't update the firmware 
 * `no-display` - does not show status messages while firmware is being updated
 * `-f` - update without confirmation
 * `no-reload` - does not reboot switch after update, so changes take place after next restart
 * `file-name` - the firmware, usually named k.img 

== DHCP/BootP relay agent/IP helper (6/28) ==
This is a translation from the online NEC guide. 

1. set up VLAN and associated port. Assign static IP address to port. This is the vlan on which the DHCP clients live.
{{{
(config)# vlan 2
(config-vlan)# exit
(config)# interface gigabitethernet 0/5
(config-if)# switchport mode access
(config-if)# switchport access vlan 2
(config-if)# exit
(config)# interface vlan 2
(config-if)# ip address 10.1.0.1 255.255.0.0
(config-if)# exit
}}}　

2. Next, set up the VLAN and interface connected to the DHCP server. 
{{{
(config)# vlan 3
(config-vlan)# exit
(config)# interface gigabitethernet 0/7
(config-if)# switchport mode access
(config-if)# switchport access vlan 3
(config-if)# exit
(config)# interface vlan 3
(config-if)# ip address 20.1.0.1 255.255.0.0
(config-if)# exit
}}}　

3. set the DHCP server's address as the helper address. 
{{{
(config)# interface vlan 2
(config-if)# ip helper-address 20.1.0.10
(config-if)# exit
}}}