Specifications

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Catalyst 2970 Switch Software Configuration Guide
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Chapter 17 Configuring DHCP Features
Displaying DHCP Information
Displaying DHCP Information
You can display a DHCP snooping binding table and configuration information for all interfaces on a
switch.
Displaying a Binding Table
The DHCP snooping binding table for each switch has binding entries that correspond to untrusted ports.
The table does not have information about hosts interconnected with a trusted port because each
interconnected switch has its own DHCP snooping binding table.
This example shows how to display the DHCP snooping binding entries for a switch.
Switch# show ip dhcp snooping binding
MacAddress IpAddress Lease(sec) Type VLAN Interface
------------------ --------------- ---------- ------- ---- --------------------
00:30:94:C2:EF:35 41.0.0.51 286 dynamic 41 gigabitethernet0/3
00:D0:B7:1B:35:DE 41.0.0.52 237 dynamic 41 gigabitethernet0/3
00:00:00:00:00:01 40.0.0.46 286 dynamic 40 gigabitethernet0/4
00:00:00:00:00:03 42.0.0.33 286 dynamic 42 gigabitethernet0/4
00:00:00:00:00:02 41.0.0.53 286 dynamic 41 gigabitethernet0/4
Table 17-2 describes the fields in the show ip dhcp snooping binding command output.
Displaying the DHCP Snooping Configuration
This example shows how to display the DHCP snooping configuration for a switch.
Switch# show ip dhcp snooping
Switch DHCP snooping is enabled
DHCP snooping is configured on following VLANs:
40-42
Insertion of option 82 is enabled
Interface Trusted Rate limit (pps)
------------------------ ------- ----------------
gigabitethernet0/1 yes unlimited
gigabitethernet0/2 yes unlimited
gigabitethernet0/3 no 5000
gigabitethernet0/4 yes unlimited
gigabitethernet0/7 yes unlimited
gigabitethernet0/5 yes unlimited
gigabitethernet0/7 yes unlimited
Table 17-2 show ip dhcp snooping binding Command Output
Field Description
MAC Address Client hardware MAC address
IP Address Client IP address assigned from the DHCP server
Lease (seconds) IP address lease time
Type Binding type; dynamic binding learned by DHCP snooping or statically
configured binding
VLAN VLAN number of the client interface
Interface Interface that connects to the DHCP client host