ip dhcp snooping...what happens when cisco 3750 is dhcp server?

Unanswered Question
Nov 24th, 2008
User Badges:

I want to implement dhcp snooping on a LAN for vlan 2. On this LAN, one 3750 is in ip routing mode and is configured as a dhcp server for clients on vlan2. I understand how to implement dhcp snooping on 2960 swithes so that their uplink ports trust the connection to this 3750, but how do I configure the 3750? Do I need to configure this switch, since it would need to effectively trust itself?

  • 1
  • 2
  • 3
  • 4
  • 5
Overall Rating: 0 (0 ratings)
Mark Yeates Mon, 11/24/2008 - 10:59
User Badges:
  • Gold, 750 points or more


I would still apply DHCP snooping on the VLAN interface on the 3750. Although it is still local to the switch there is still the possibility.... It's better to be safe then sorry.



murray-davis Mon, 11/24/2008 - 11:21
User Badges:

Thank you, Mark. If I understand correctly, here is how I would configure the 3750:

ip dhcp snooping vlan 2

int vlan 2

ip dhcp snooping trust

no ip dhcp snooping information option

ip dhcp snooping

NOTE: Here is how I have dhcp configured on this 3750 switch for vlan 2 which has been working fine for about 2 years.

ip dhcp excluded-address


ip dhcp pool Clients




interface Vlan2

ip address

Mark Yeates Mon, 11/24/2008 - 11:29
User Badges:
  • Gold, 750 points or more

That should work just fine.



This Discussion