Hi, I have setup a network as per diagram attach and turn on DHCP snooping on access layer switch and distribution switch. After configure, an issue is all users at access switch are not able to get IP address. Can I know is it I need to configure DHCP snooping at Server farm switches and also trust the DHCP server? If yes, can I know how to configure the DHCP snooping over layer 3?
Here is the configure at access layer and distribution switch
Access layer
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ip dhcp snooping
ip dhcp snooping vlan <vlan id>
no ip dhcp snooping information option
ip dhcp snnoping database flash:dhcp.txt
Up link port
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interface port-channel<Number>
description <description>
switchport mode trunk
ip dhcp snooping trust
Physical port for up link
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interface TenGigabitEthernet<port number>
description <description>
switchport mode trunk
ip dhcp snooping trust
channel-group <Number> mode active
End host port
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interface GigabitEthernet<port number>
description <description>
switchport mode access
switchport access vlan <ID>
switchport voice vlan <ID>
ip dhcp snooping limit rate 10
Distribution Switch
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ip dhcp snooping
ip dhcp snooping vlan <vlan id>
no ip dhcp snooping information option
ip dhcp snnoping database bootdisk:dhcp.txt
Up link port
-------------
interface port-channel<Number>
description <description>
switchport mode trunk
ip dhcp snooping trust
Physical port for up link
-----------------------------
interface TenGigabitEthernet<port number>
description <description>
switchport mode trunk
ip dhcp snooping trust
channel-group <Number> mode active
I also insert this 3 command at access switch and distribution switch, but it also not work
ip dhcp snooping information option allow-untrusted
ip dhcp snooping database write-delay 30
ip dhcp snooping database timeout 30
Thanks,
John