How do I get my VLAN 40 to communicated to my DHCP Server to get an Address

[tanoopsungha]

My DHCP Server is on 192.43.100.100

I have VLAN Set up on my SG500 switch.

I want to have the VLAN 40 on my switch to communicate to the DHCP server so that anything on the VLAN40 can pick up an IP Address automatically.

I have created a Scope called VLAN 40 - 192.43.104.0 on the DHCP Server.

What do I need to do to get this to work? What command to I need to type to get this working? Do I need to use IPHelper?

[Sandeep Choudhary]

Hi Tanoop ,

just provide the ip helper address under interface vlan40.

just like this:

interface Vlan40

ip address 192.43.104.254 255.255.255.0----check this according to u

ip helper-address 192.43.x.x--------------Where DHCP server address

and teh interface where ur DHCP server conneted put this config:

interface FastEthernet0/17

description *** xyz ***

.

.

.

ip dhcp snooping trust

Regards

Please rate if it help

[melissaguerrero]

Hello, you can confirm me if it is possible configure as DHCP Server to the SG500?

[Alessio Andreoli]

hi,

use ip helper-address command below the vlan 40 interface config.

Alessio

[tanoopsungha]

Hi,

This is what I get.. what am I missing for the mandatory parameter?

Switch1#config

Switch1(config)#interface Vlan40

Switch1(config-if)#ip address 192.43.104.254 255.255.255.0

Duplicated IP interface on the same subnet.

Switch1(config-if)#ip address 192.43.104.1 255.255.255.0

Switch1(config-if)#ip helper-address 192.43.100.100

% missing mandatory parameter

Switch1(config-if)#

[Sandeep Choudhary]

HI Tanoop,

Can you paste ur config?

so that we can find the error:

I just attached the test config .....see this and tray again.

Regards

Please rate if it helps.

[tanoopsungha]

Switch1#show running-config

vlan database

vlan 20,30,40,50,60,70

exit

voice vlan state disabled

voice vlan oui-table add 0001e3 Siemens_AG_phone________

voice vlan oui-table add 00036b Cisco_phone_____________

voice vlan oui-table add 00096e Avaya___________________

voice vlan oui-table add 000fe2 H3C_Aolynk______________

voice vlan oui-table add 0060b9 Philips_and_NEC_AG_phone

voice vlan oui-table add 00d01e Pingtel_phone___________

voice vlan oui-table add 00e075 Polycom/Veritel_phone___

voice vlan oui-table add 00e0bb 3Com_phone______________

ip dhcp snooping

ip dhcp snooping information option allowed-untrusted

ip dhcp relay address 192.9.100.100

ip dhcp relay enable

ip dhcp information option

bonjour interface range vlan 1

hostname Switch1

line console

exec-timeout 30

exit

line ssh

exec-timeout 30

exit

line telnet

exec-timeout 30

exit

username cisco password encrypted 490c76f46beb5a5fcbf85cc9b29adedd49f35180 privi

lege 15

no snmp-server server

ip http timeout-policy 1800

ip http secure-server

ip domain name mdha.local

ip name-server  192.9.100.100

ip telnet server

!

interface vlan 1

ip address 192.9.100.82 255.255.254.0

no ip address dhcp

!

interface vlan 20

name Voice

!

interface vlan 30

name Servers

!

interface vlan 40

name Computers

ip address 192.9.104.254 255.255.255.0

ip dhcp relay enable

!

interface vlan 50

name Printers

!

interface vlan 60

name Wireless

!

interface vlan 70

name Network

!

interface gigabitethernet1/1/1

ip dhcp snooping trust

!

interface gigabitethernet1/1/7

switchport trunk native vlan 40

switchport default-vlan tagged

!

banner login ^C

CH COMMS ROOM

^C

macro auto processing type host enabled

macro auto processing type router enabled

ip helper-address all 192.0.100.100 37 42 49 53 137 138

ip helper-address all 192.9.100.100 37 42 49 53 137 138

ip route 192.9.102.0 255.255.255.0 192.9.100.100

Switch1#

[melissaguerrero]

Hola, me podrías indicar si es posible que el Switch SG500 actúe como DHCP Server??

[Pradeep S.R.]

Hi Tanoop,

U need to enable intervlan routing for the Server to communicate with that.

Refer Below Docs as well...

http://networkcity.blogspot.in/2010/01/configuring-inter-vlan-routing-and-dhcp.html?spref=fb

http://www.cisco.com/en/US/tech/tk389/tk815/technologies_configuration_example09186a008019e74e.shtml

Regards

Pradeep Poojari

Please rate if it Serves you

[melissaguerrero]

Hola, me podrías indicar si es posible que el Switch SG500 actúe como DHCP Server??

[tanoopsungha]

Any ideas on what I am doing wrong from the Logs??