Reference Guide

Dynamic Host Configuration Protocol (DHCP) | 507
Usage Information
You must allocate at least one FP block to ipmacacl before you can enable IP+MAC Source Address
Validation.
1 Use the command cam-acl l2acl from CONFIGURATION mode
2 Save the running-config to the startup-config
3 Reload the system.
ip dhcp snooping vlan
c e s z
Enable DHCP Snooping on one or more VLANs.
Syntax
[no] ip dhcp snooping vlan name
Parameters
Command Modes
CONFIGURATION
Default
Disabled
Command History
Usage Information
When enabled the system begins creating entries in the binding table for the specified VLAN(s). Note
that learning only happens if there is a trusted port in the VLAN.
Related
Commands
ip dhcp relay information-option
c e s z
Enable Option 82.
Syntax
ip dhcp relay information-option [trust-downstream]
Parameters
Command Modes
CONFIGURATION
Default
Disabled
Command History
name
Enter the name of a VLAN on which to enable DHCP Snooping.
Version 8.3.11.1 Introduced on the Z9000.
Version 8.3.1.0 Introduced on E-Series.
Version 7.8.1.0 Introduced on C-Series and S-Series
ip dhcp snooping trust
Configure an interface as trusted.
trust-downstream
Configure the system to trust Option 82 when it is received from the
previous-hop router.
Version 8.3.11.1 Introduced on the Z9000.
Version 8.3.1.0 Introduced on E-Series.
Version 7.8.1.0 Introduced on C-Series and S-Series