Dell Force10 S4820T FTOS Command Reference Guide - Page 509

ip dhcp snooping c e s Enable DHCP Snooping globally. Syntax Command Modes [no] ip dhcp snooping CONFIGURATION Default Disabled Command History Version 8.3.1.0 Version 8.2.1.0 Version 7.8.1.0 Introduced on E-Series. Introduced on C-Series and S-Series for Layer 2 interfaces. Introduced on C-Series and S-Series on Layer 3 interfaces. Usage Information When enabled, no learning takes place until snooping is enabled on a VLAN. Upon disabling DHCP Snooping the binding table is deleted, and Option 82, IP Source Guard, and Dynamic ARP Inspection are disabled. Introduced in FTOS version 7.8.1.0, DHCP Snooping was available for Layer 3 only and dependent on DHCP Relay Agent (ip helper-address). FTOS version 8.2.1.0 extends DHCP Snooping to Layer 2, and you do not have to enable relay agent to snoop on Layer 2 interfaces. Related Commands ip dhcp snooping vlan Enable DHCP Snooping on one or more VLANs. ip dhcp snooping database c e s Delay writing the binding table for a specified time. Syntax Parameters ip dhcp snooping database write-delay minutes minutes Range: 5-21600 Command Modes CONFIGURATION Default None Command History Version 8.3.1.0 Version 7.8.1.0 Introduced on E-Series. Introduced on C-Series and S-Series ip dhcp snooping binding c e s Create a static entry in the DHCP binding table. Dynamic Host Configuration Protocol (DHCP) | 509