Displaying Ip Source Guard Information; Understanding Dhcp Server Port-Based Address Allocation - Cisco Catalyst 2960 Software Configuration Manual

Displaying IP Source Guard Information

This example displays all inactive IP or MAC binding entries for all interfaces. The host was first learned
on GigabitEthernet 0/1 and then moved to GigabitEthernet 0/2. the IP or MAC binding entries learned
on GigabitEthernet 0/1 are marked as inactive.
Switch# show ip device tracking all inactive
IP Device Tracking = Enabled
IP Device Tracking Probe Count = 3
IP Device Tracking Probe Interval = 30
---------------------------------------------------------------------
IP Address
---------------------------------------------------------------------
200.1.1.8
200.1.1.9
200.1.1.10
200.1.1.1
200.1.1.2
200.1.1.3
200.1.1.4
200.1.1.5
200.1.1.6
200.1.1.7
This example displays the count of all IP device tracking host entries for all interfaces:
Switch# show ip device tracking all count
Total IP Device Tracking Host entries: 5
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Interface
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Gi0/3
Displaying IP Source Guard Information
To display the IP source guard information, use one or more of the privileged EXEC commands in
Table
Table 20-3 Commands for Displaying IP Source Guard Information
Command
show ip device tracking
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
Catalyst 2960 and 2960-S Switches Software Configuration Guide, Release 15.0(1)SE
20-20
MAC Address
0001.0600.0000
0001.0600.0000
0001.0600.0000
0001.0600.0000
0001.0600.0000
0001.0600.0000
0001.0600.0000
0001.0600.0000
0001.0600.0000
0001.0600.0000
Maximum Limit
5
20-3:
Purpose
Display the active IP or MAC binding entries for all interfaces.
Display the IP source bindings on a switch.
Display the IP source guard configuration on the switch.
Chapter 20
Vlan Interface
8 GigabitEthernet0/1
8 GigabitEthernet0/1
8 GigabitEthernet0/1
8 GigabitEthernet0/1
8 GigabitEthernet0/1
8 GigabitEthernet0/1
8 GigabitEthernet0/1
8 GigabitEthernet0/1
8 GigabitEthernet0/1
8 GigabitEthernet0/1
Number of Entries
Configuring DHCP and IP Source Guard Features
STATE
INACTIVE
INACTIVE
INACTIVE
INACTIVE
INACTIVE
INACTIVE
INACTIVE
INACTIVE
INACTIVE
INACTIVE
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