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DHCP Snooping

Rupesh Kashyap
Level 1
Level 1

‎11-12-2009 03:38 AM - edited ‎03-04-2019 06:41 AM

Hi, I have server farm and user farm having 5 layer-2 switches each farm.Connectivity between both farms are L3. I have DHCP server in Server farm. I want to enable DHCP Snooping. I have made all ports as Untrusted in User farm. Now Should I have to make Trust port on Server farm switch where DHCP server is hosted? Can DHCP snooping cross L-3 domain?

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Amit Singh
Cisco Employee
Cisco Employee

‎11-12-2009 05:15 AM

Yes, you have the trust interface from where the DHCP packets will be travelling to the switches. If its a trunk port, trust the trunk port. If it is a Vlan SVI or L3 port using the IP helper-address command to DHCP relay, trust the ports as well.

http://www.cisco.com/en/US/docs/switches/lan/catalyst3560/software/release/12.2_25_see/configuration/guide/swdhcp82.html#wp1070843

HTH

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