08-27-2014 10:34 AM - edited 03-03-2019 07:34 AM
I have a network with mutiple vlans multiple dhcp servers. Someone else set it up but is unavailable to make the any changes. I would like to use a network that was shutdown vlan 26/192.168.26.x/23 see the config below. I have the dhcp server 192.168.26.0 length 23 I changed one of the interfaces to that vlan and i am not getting a dhcp address. I can ping the dhcp server 192.168.16.12.
!
interface GigabitEthernet1/0/27
switchport access vlan 26
interface Vlan1
ip address 192.168.29.1 255.255.255.0
ip helper-address 192.168.28.2
!
interface Vlan2
description CBT Internet
ip address 66.42.138.142 255.255.255.224
shutdown
!
interface Vlan5
ip address 192.168.5.1 255.255.255.0
!
interface Vlan9
description OldSAN Do Not ShutDown
ip address 192.168.6.1 255.255.255.0
!
interface Vlan16
description Servers
ip address 192.168.30.1 255.255.255.0 secondary
ip address 192.168.16.1 255.255.255.0
!
interface Vlan19
description AspectServers
ip address 192.168.19.1 255.255.255.0
!
interface Vlan21
description Wireless
ip address 192.168.21.1 255.255.255.0
shutdown
!
interface Vlan24
ip address 192.168.24.1 255.255.255.0
!
interface Vlan26
ip address 192.168.26.1 255.255.254.0
ip helper-address 192.168.16.12
!
interface Vlan28
description ShoreTel
ip address 192.168.28.1 255.255.255.0
!
interface Vlan121
ip address 192.168.121.1 255.255.255.0
!
ip classless
ip route 0.0.0.0 0.0.0.0 192.168.16.4
ip route 192.168.120.0 255.255.255.0 192.168.16.4
no ip http server
no ip http secure-server
Thank you for any help you can provide
08-27-2014 10:52 AM
If this is your interface config
interface GigabitEthernet1/0/27
switchport access vlan 26
you need to add switchport mode access
08-27-2014 11:40 AM
Yes that is the interface how could i forget the mode let me change it.
08-27-2014 05:59 PM
Hi there,
Cisco has DTP enabled by default set to "auto" if connected to a server or PC it will automatically go to access.
Nonetheless, try hardcoding it into access see if it works
Based on your config, can you verify your DHCP server IP?
You stated in your problem that it is 192.168.16.12, but in your configuration it is 192.168.16.2
Kindly check and change if necessary.
Don't forget to rate or mark as correct helpful post! :)
08-28-2014 06:35 AM
I check switchport mode access that isnt it. I dont see 192.168.16.2 where do you see that?
08-28-2014 06:51 AM
interface Vlan1
ip address 192.168.29.1 255.255.255.0
ip helper-address 192.168.28.2
Please verify your configuration
09-02-2014 03:39 AM
This ^^, it doesn't matter, it will still work, however, in the interests of security all access ports should be configured as such.
OP, how do you know your DHCP server is working correctly?
Martin
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