Cisco WS-C3750-48PS-S User Manual

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Catalyst 3750 Switch Software Configuration Guide
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Chapter 21 Configuring DHCP Features and IP Source Guard
Displaying DHCP Snooping Information
Displaying DHCP Snooping Information
This section describes how to display configuration information for all interfaces on a switch and the
configuration information, status, and statistics for the DHCP snooping binding database, also referred
to as a binding table.
• Displaying the DHCP Snooping Configuration, page 21-14
• Displaying the DHCP Snooping Binding Database, page 21-14
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
Verification of hwaddr field is enabled
Interface Trusted Rate limit (pps)
------------------------ ------- ----------------
gigabitethernet1/0/1 yes unlimited
gigabitethernet2/0/2 no 100
gigabitethernet2/0/3 yes unlimited
gigabitethernet2/0/4 yes unlimited
Displaying the DHCP Snooping Binding Database
The DHCP snooping binding database for each switch has binding entries that correspond to untrusted
ports. The database does not have information about hosts interconnected with a trusted port.
Use the show ip dhcp snooping binding privileged EXEC command to display only the dynamically
configured bindings in the DHCP snooping binding database. Use the show ip source binding privileged
EXEC command to display the dynamically and statically configured bindings.
If DHCP snooping is enabled and an interface changes to the down state, the switch does not delete the
statically configured bindings.
This example shows how to display the dynamically configured DHCP snooping binding entries for a
switch:
Switch# show ip dhcp snooping binding
MacAddress IpAddress Lease(sec) Type VLAN Interface
------------------ --------------- ---------- ------------- ---- --------------------
01:02:03:04:05:06 10.1.2.150 9837 dhcp-snooping 20 GigabitEthernet2/0/1
00:D0:B7:1B:35:DE 10.1.2.151 237 dhcp-snooping 20 GigabitEthernet2/0/1
00:00:00:00:00:01 40.0.0.46 286 dhcp-snooping 20 GigabitEthernet2/0/2
00:00:00:00:00:03 42.0.0.33 286 dhcp-snooping 22 GigabitEthernet2/0/2
00:00:00:00:00:02 41.0.0.53 286 dhcp-snooping 21 GigabitEthernet2/0/2
Table 21-2 describes the fields in the show ip dhcp snooping binding command output.

Cisco WS-C3750-48PS-S Specifications

General

Brand	Cisco
Model	WS-C3750-48PS-S
Category	Switch
Language	English