Administrator Guide

Version 9.0.2.0 Introduced on the S6000.
Version 8.3.11.1 Introduced on the Z9000.
Version 8.3.1.0 Introduced on the E-Series.
Version 7.8.1.0 Introduced on the C-Series and S-Series.
Usage
Information
When enabled, the system begins creating entries in the binding table for the
specified VLANs.
NOTE: Learning only happens if there is a trusted port in the VLAN.
Related
Commands
ip dhcp snooping trust — configures an interface as trusted.
ip dhcp relay information-option
Enable Option 82.
Z9000
Syntax
ip dhcp relay information-option [trust-downstream] [vpn]
Parameters
trust-
downstream
Configure the system to trust Option 82 when it is received
from the previous-hop router.
vpn Enter the keyword vpn to add VPN/VRF related sub-option
to relay agent information Option 82.
NOTE: Adds the VPN/VRF related sub-options into the
relay agent information option(82). When DHCP
broadcasts are forwarded by the relay agent from clients
to DHCP server.
Default Disabled.
Command
Modes
CONFIGURATION
Command
History
This guide is platform-specific. For command information about other platforms,
refer to the relevant Dell Networking OS Command Line Reference Guide.
The following is a list of the Dell Networking OS version history for this command.
Version 9.4.
(0.0)
Added support for VRF.
Version 9.0.2.0 Introduced on the S6000.
Version
8.3.19.0
Introduced on the S4820T.
Version 8.3.11.1 Introduced on the Z9000.
Dynamic Host Configuration Protocol (DHCP)
539