Displaying Ip Source Guard Information; Understanding Dhcp Server Port-Based Address Allocation - Cisco IE-3000-8TC Software Configuration Manual

Chapter 23 Configuring DHCP Features and IP Source Guard
Command
Step 6
end
Step 7
show ip verify source [interface
interface-id]
Step 8 show ip source binding [ip-address]
[mac-address] [dhcp-snooping | static]
[inteface interface-id] [vlan vlan-id]
Step 9 copy running-config startup-config
To disable IP source guard with source IP address filtering, use the no ip verify source interface
configuration command.
To delete a static IP source binding entry, use the no ip source global configuration command.
This example shows how to enable IP source guard with source IP and MAC filtering on VLANs 10
and 11:
Switch# configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
Switch(config)# interface gigabitethernet0/1
Switch(config-if)# ip verify source port-security
Switch(config-if)# exit
Switch(config)# ip source binding 0100.0022.0010 vlan 10 10.0.0.2 interface
gigabitethernet0/1
Switch(config)# ip source binding 0100.0230.0002 vlan 11 10.0.0.4 interface
gigabitethernet0/1
Switch(config)# end

Displaying IP Source Guard Information

To display the IP source guard information, use one or more of the privileged EXEC commands in
Table
Table 23-3 Commands for Displaying IP Source Guard Information
Command
show ip source binding
show ip verify source

Understanding DHCP Server Port-Based Address Allocation

DHCP server port-based address allocation is a feature that enables DHCP to maintain the same IP
address on an Ethernet switch port regardless of the attached device client identifier or client hardware
address.
When Ethernet switches are deployed in the network, they offer connectivity to the directly connected
devices. In some environments, such as on a factory floor, if a device fails, the replacement device must
be working immediately in the existing network. With the current DHCP implementation, there is no
guarantee that DHCP would offer the same IP address to the replacement device. Control, monitoring,
and other software expect a stable IP address associated with each device. If a device is replaced, the
address assignment should remain stable even though the DHCP client has changed.
OL-13018-03
Purpose
Return to privileged EXEC mode.
Display the IP source guard configuration for all interfaces or for a
specific interface.
Display the IP source bindings on the switch, on a specific VLAN, or on
a specific interface.
(Optional) Save your entries in the configuration file.
23-3:
Purpose
Display the IP source bindings on a switch.
Display the IP source guard configuration on the switch.
Displaying IP Source Guard Information
Cisco IE 3000 Switch Software Configuration Guide
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