Reference Guide

ip dhcp snooping vlan
Enable DHCP Snooping on one or more VLANs.
C-Series, E-Series, Z-Series, S-Series
Syntax
[no] ip dhcp snooping vlan name
Parameters
name Enter the name of a VLAN on which to enable DHCP Snooping.
Defaults Disabled
Command Modes CONFIGURATION
Command History
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
VLAN(s).
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.
C-Series, E-Series, S-Series, Z-Series
Syntax
ip dhcp relay information-option [trust-downstream]
Parameters
trust-downstream Configure the system to trust Option 82 when it is received from the
previous-hop router.
Default Disabled.
Command Modes CONFIGURATION
Command History
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 C-Series and S-Series.
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