Service Manual

To enable IP source address validation, use the following command.
NOTE: If you enable IP source guard using the ip dhcp source-address-validation
command and if there are more entries in the current DHCP snooping binding table than the
available CAM space, SAV may not be applied to all entries. To ensure that SAV is applied correctly
to all entries, enable the
ip dhcp source-address-validation command before adding
entries to the binding table.
• Enable IP source address validation.
INTERFACE mode
INTERFACE PORT EXTENDER
ip dhcp source-address-validation
• Enable IP source address validation with VLAN option.
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
Dynamic Host Configuration Protocol (DHCP)
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