Specifications

set dhcpsnooping verify
18-8 DHCP Snooping and Dynamic ARP Inspection
Usage
WhenenabledgloballyandonVLANs,DHCPsnoopingbuildsitsbindingsdatabasefromDHCP
clientmessagesreceivedonuntrustedports.Suchentriesinthedatabasearedynamicentries
whichwillberemovedinresponsetovalidDECLINE,RELEASE,andNACKmessagesorwhen
theabsoluteleasetimeoftheentryexpires.
Youcanaddstaticentriestothebindingsdatabasewiththiscommand.
Example
Thisexamplecreatesastaticentry,associatingMACaddress00:01:02:33:44:55withIPaddress
192.168.10.10andVLAN10,portge.1.1.
B2
(rw)->set dhcpsnooping binding 00:01:02:33:44:55 vlan 10 192.168.10.10 port
ge.1.1
set dhcpsnooping verify
UsethiscommandtoenableordisableDHCPsnoopingtofilteronsourceMACaddress.
Syntax
set dhcpsnooping verify mac-address {enable | disable}
Parameters
Defaults
SourceMACaddressverificationisenabledbydefault.
Mode
Switchcommand,read‐write.
Usage
Whenthisverificationisenabled,theDHCPsnoopingapplicationcomparesthesourceMAC
addresscontainedinvalidclientmessageswiththeclient’shardwareaddress.Ifthereisa
mismatch,DHCPsnoopinglogstheeventanddropsthepacket.
Usetheshow dhcpsnoopingcommandtodisplaythestatus(enabledordisabled)of
sourceMAC
addressverificationforeachinterfaceinanenabledVLAN.Theshow dhcpsnoopingstatistics
commandshowstheactualnumberofMACverificationerrorsthatoccurredonuntrustedports.
Example
ThisexampledisablessourceMACaddressverificationandlogging.
B2
(rw)->set dhcpsnooping verify mac-address disable
enable EnablesverificationofthesourceMACaddressinclientmessages
againsttheclienthardwareaddress.
disable DisablesverificationofthesourceMACaddressinclientmessages
againsttheclienthardwareaddress.