D-Link DGS-6600-48T Product Manual - Page 260

DGS-6604 ip dhcp relay information trust-all ip dhcp relay information trust-all Use this global command to direct the DHCP relay agent to accept the packets with giaddr==0 (this relay agent is the first relay of this DHCP request packet) and the relay agent information option already present in the packet. Use the no form of the command to specify to drop these DHCP request packets. ip dhcp relay information trust-all no ip dhcp relay information trust-all Syntax None Default Command Mode The interface default is un-trusted. Global configuration Usage Guideline When the IP DHCP relay information is trusted, and the gateway address in the DHCP request packet is set to all zeros, but the relay agent information option is present in the packet, then the DHCP relay agent will accept the packet. When the packet is not trusted, then it will be discarded. This command is under global configuration; it will enable/disable all existing VLANs' DHCP Relay Agent trusted relay agent information. However, the command takes effect only in the running configuration and is not kept in NVRAM for the next boot cycle using the startup configuration. To configure a specific interface's trust status, use the ip dhcp relay information trusted interface command. Example This command shows how to enable all interfaces with the DHCP relay agent set to accept the packets with giaddr==0 and the relay agent information option already present in the packet. Switch# configure Switch(config)# ip dhcp relay information trust-all Swtich(config)# Verify the settings by entering the show ip dhcp relay information trustedsources command CLI Reference Guide 250