November 3, 2010
Cisco DHCP snooping with a Cisco DHCP relay (ip helper) and DHCP option-82
By default, the Cisco DHCP snooping code on the Cisco Catalyst switches inserts option-82 into the DHCP packet but sets giaddr to 0.0.0.0, which causes the Cisco DHCP relay (ip helper) to drop all DHCP packets from a Cisco switch configured with DHCP snooping. To work around this, you can either disable the insertion of Option-82 on the switch performing...