DHCP snooping blocks all dhcp traffic

[harm.prins]

Hello,

I'm struggling with DHCP snooping, and I can't find any helpful information on the internet. So i hope someone here can help.

I'm configuring DHCP snooping, and (as far as i know), I've configured it according to the manual. But now my DHCP won't work anymore (DHCP request failed on end devices). When I disable DHCP snooping, everything works again.

Context: This all takes place in Packet Traces, on a 2960 switch

My config looks like this (all fastethernet ports are end devices, g0/1 is connected to the DHCP server via some other switches):

Building configuration...

Current configuration : 2970 bytes
!
version 15.0
no service timestamps log datetime msec
no service timestamps debug datetime msec
no service password-encryption
!
hostname Sw-Zw-Office-1
!
!
!
!
!
ip dhcp snooping vlan 10,20,50,100,150
ip dhcp snooping
!
spanning-tree mode pvst
spanning-tree extend system-id
!
interface FastEthernet0/1
 switchport access vlan 10
 ip dhcp snooping limit rate 10
 switchport mode access
 switchport port-security
 switchport port-security mac-address sticky 
 switchport port-security mac-address sticky 0060.3E05.7998
 spanning-tree portfast
 spanning-tree bpduguard enable
!
interface FastEthernet0/2
 switchport access vlan 10
 ip dhcp snooping limit rate 10
 switchport mode access
 switchport port-security
 switchport port-security mac-address sticky 
 switchport port-security mac-address sticky 0002.16BD.2461
 spanning-tree portfast
 spanning-tree bpduguard enable
!
interface FastEthernet0/3
 switchport access vlan 20
 ip dhcp snooping limit rate 10
 switchport mode access
 switchport port-security
 switchport port-security mac-address sticky 
 switchport port-security mac-address sticky 0090.215B.1C3D
 spanning-tree portfast
 spanning-tree bpduguard enable
!
interface FastEthernet0/4
 switchport access vlan 20
 ip dhcp snooping limit rate 10
 switchport mode access
 switchport voice vlan 150
 switchport port-security
 switchport port-security maximum 3
 switchport port-security mac-address sticky 
 switchport port-security mac-address sticky 0001.C7C1.6B70
 switchport port-security mac-address sticky 0005.5E95.C343
 spanning-tree portfast
 spanning-tree bpduguard enable
 mls qos trust cos
!
interface FastEthernet0/5
 switchport access vlan 10
 ip dhcp snooping limit rate 10
 switchport mode access
 switchport port-security
 switchport port-security mac-address sticky 
 switchport port-security mac-address sticky 0060.5C17.69BC
 spanning-tree portfast
 spanning-tree bpduguard enable
!
interface FastEthernet0/6
 shutdown
!
interface FastEthernet0/7
 shutdown
!
interface FastEthernet0/8
 shutdown
!
interface FastEthernet0/9
 shutdown
!
interface FastEthernet0/10
 shutdown
!
interface FastEthernet0/11
 shutdown
!
interface FastEthernet0/12
 shutdown
!
interface FastEthernet0/13
 shutdown
!
interface FastEthernet0/14
 shutdown
!
interface FastEthernet0/15
 shutdown
!
interface FastEthernet0/16
 shutdown
!
interface FastEthernet0/17
 shutdown
!
interface FastEthernet0/18
 shutdown
!
interface FastEthernet0/19
 shutdown
!
interface FastEthernet0/20
 shutdown
!
interface FastEthernet0/21
 shutdown
!
interface FastEthernet0/22
 shutdown
!
interface FastEthernet0/23
 shutdown
!
interface FastEthernet0/24
 shutdown
!
interface GigabitEthernet0/1
 switchport trunk native vlan 100
 switchport trunk allowed vlan 10,20,50,100,150
 ip dhcp snooping trust
 switchport mode trunk
!
interface GigabitEthernet0/2
 shutdown
!
interface Vlan1
 no ip address
 shutdown
!
!
!
!
line con 0
!
line vty 0 4
 login
line vty 5 15
 login
!
!
!
!
end

[MHM Cisco World]

follow

[paul driver · Accepted solution]

Hello

Appy the following and test again:

no ip dhcp snooping information option 

[harm.prins]

Yeah that works! But why?

Thanks!