Dell Force10 S25N-S50N FTOS Command Line Reference Guide FTOS 8.4.2.7 E-Series - Page 467

Command Modes 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 ip dhcp snooping database write-delay minutes Parameters 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. Syntax [no] ip dhcp snooping binding mac address vlan-id vlan-id ip ip-address interface type slot/port lease number Parameters mac address vlan-id vlan-id ip ip-address Enter the keyword mac followed by the MAC address of the host to which the server is leasing the IP address. Enter the keyword vlan-id followed by the VLAN to which the host belongs. Range: 2-4094 Enter the keyword ip followed by the IP address that the server is leasing. Dynamic Host Configuration Protocol (DHCP) | 467