Concept Guide
• For a VLAN, enter the keyword vlan followed by a number from 1 to 4094.
Command Modes EXEC Privilege
Supported Modes All Modes
Default None.
Command History
Version Description
9.9(0.0) Introduced on the FN IOM.
9.4(0.0) Supported on the FN I/O Aggregator.
8.3.17.0 Supported on the M I/O Aggregator.
show ip dhcp lease
Displays lease information about the dynamic IP address currently assigned to a DHCP client-enabled interface.
Syntax
show ip dhcp lease[interface type slot/port]
Parameters
interface type slot/
port
Display DHCP client statistics on the specied interface.
• For the management interface on the stack-unit, enter the keyword
managementethernet followed by slot/port information. The slot and port range is
0.
• For a VLAN, enter the keyword vlan followed by a number from 1 to 4094.
Command Modes EXEC Privilege
Supported Modes All Modes
Default Display DHCP lease information on all DHCP client-enabled interfaces on the switch.
Command History
Version Description
9.9(0.0) Introduced on the FN IOM.
9.4(0.0) Supported on the FN I/O Aggregator.
8.3.17.0 Supported on the M I/O Aggregator.
Commands to Congure Secure DHCP
DHCP, as dened by RFC 2131, provides no authentication or security mechanisms. Secure DHCP is a suite of features that protects
networks that use dynamic address allocation from spoong and attacks.
arp inspection
Enable dynamic arp inspection (DAI) on a VLAN.
Syntax
arp inspection
Dynamic Host Conguration Protocol 455