unmanaged switch connected to managed switch is not passing dhcp and traffic

[Liban]

I have unmanaged switch that is connected to cisco 2960 switch on a port with vlan160. the unmanaged switch is not passing the dhcp for the vlan160. the port is configured as access. I tried to configure as trunk but it is still not passing the dhcp. Also the port is configured as a dhcp snooping trust.

[Julio E. Moisa]

Hi

Have you tried configuring the port as access on the Cisco 2960 and removing dhcp snooping trust?

[Liban]

@Julio E. Moisa   I didn't try that. since dhcp snooping is configured on the vlan, i thought it would be necessary to add that port to the trusted list. anyway i'll try

[Julio E. Moisa]

Hi

Ip dhcp snooping trust is configured under the interface(s) over the path going through the DHCP server, with that you can guarantee the path to a legitime DHCP server in your infrastructure. 

SW2960 ---- trunk (ip dhcp snooping trust) ----- Switch ---- Company DHCP Server

    |

access mode

    |

Unmanaged switch 

I assume your unmmanage switch is used for end users, right?. 

[Liban]

@Julio E. Moisa , yes it is for end users. APs are also connected to the unmanaged switch

[Julio E. Moisa]

Hi Liban,

Have you already tried just configuring the port as access?

[Liban]

Hi @Julio E. Moisa,
Initial config of the port is access, i tried changing it to trunk, it didn't work.

[paul driver]

Hello

SW2960 ---- trunk (ip dhcp snooping trust) ----- Switch ---- Company DHCP Server

The switch highlighted, is this a L3 switch - what make/model is it?

if your DHCP server isnt local to you lan network then you will require helper addressing.

with snooping on - no ip dhcp relay information option.

However I would suggest removing dhcp snooping and troubleshoot dhcp allocation first then apply snooping once you know it works.

access-list 100 permit ip host 0.0.0.0 host 255.255.255.255
debug ip packet detail 100

res
Paul

[Yachay]

Assuming that the port is configured in access mode and as a trusted port, have you tried running the following command: SW1(config)# ip dhcp snooping information option?