Dhcp Mac Source Address Validation; Enabling Ip+Mac Source Address Validation - Dell S4820T Configuration Manual

INTERFACE mode
ip dhcp source-address-validation vlan vlan-id
NOTE:
Before enabling SAV With VLAN option, allocate at least one FP block to the ipmacacl CAM
region.

DHCP MAC Source Address Validation

DHCP MAC source address validation (SAV) validates a DHCP packet's source hardware address against
the client hardware address field (CHADDR) in the payload.
Dell Networking OS ensures that the packet's source MAC address is checked against the CHADDR field
in the DHCP header only for packets from snooped VLANs.
• Enable DHCP MAC SAV.
CONFIGURATION mode
ip dhcp snooping verify mac-address

Enabling IP+MAC Source Address Validation

IP source address validation (SAV) validates the IP source address of an incoming packet and optionally
the VLAN ID of the client against the DHCP snooping binding table. IP+MAC SAV ensures that the IP
source address and MAC source address are a legitimate pair, rather than validating each attribute
individually. You cannot configure IP+MAC SAV with IP SAV.
1. Allocate at least one FP block to the ipmacacl CAM region.
CONFIGURATION mode
cam-acl l2acl
2. Save the running-config to the startup-config.
EXEC Privilege mode
copy running-config startup-config
3. Reload the system.
EXEC Privilege
reload
4. Do one of the following.
• Enable IP+MAC SAV.
INTERFACE mode
ip dhcp source-address-validation ipmac
• Enable IP+MAC SAV with VLAN option.
INTERFACE mode
ip dhcp source-address-validation ipmac vlan vlan-id
Dynamic Host Configuration Protocol (DHCP)
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