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Cisco Catalyst 3750-E User Manual

Cisco Catalyst 3750-E
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22-12
Catalyst 3750-E and 3560-E Switch Software Configuration Guide
OL-9775-08
Chapter 22 Configuring DHCP Features and IP Source Guard
Configuring DHCP Features
To remove the DHCP packet forwarding address, use the no ip helper-address address interface
configuration command.
Enabling DHCP Snooping and Option 82
Beginning in privileged EXEC mode, follow these steps to enable DHCP snooping on the switch:
Step 8
switchport access vlan vlan-id Assign the ports to the same VLAN as configured in
Step 2.
Step 9
end Return to privileged EXEC mode.
Step 10
show running-config Verify your entries.
Step 11
copy running-config startup-config (Optional) Save your entries in the configuration file.
Command Purpose
Command Purpose
Step 1
configure terminal Enter global configuration mode.
Step 2
ip dhcp snooping Enable DHCP snooping globally.
Step 3
ip dhcp snooping vlan vlan-range Enable DHCP snooping on a VLAN or range of VLANs. The range is 1
to 4094.
You can enter a single VLAN ID identified by VLAN ID number, a series
of V
LAN IDs separated by commas, a range of VLAN IDs separated by
hyphens, or a range of VLAN IDs separated by entering the starting and
ending VLAN IDs separated by a space.
Step 4
ip dhcp snooping information option Enable the switch to insert and remove DHCP relay information
(option-82 field) in forwarded DHCP request messages to the DHCP
server. This is the default setting.
Step 5
ip dhcp snooping information option
format remote-id [string ASCII-string |
hostname]
(Optional) Configure the remote-ID suboption.
You can configure the remote ID as:
String of up to 63 ASCII characters (no spaces)
Configured hostname for the switch
Note If the hostname is longer than 63 characters, it is truncated to 63
characters in the remote-ID configuration.
The default remote ID is the switch MAC address.
Step 6
ip dhcp snooping information option
allow-untrusted
(Optional) If the switch is an aggregation switch connected to an edge
switch, enable the switch to accept incoming DHCP snooping packets
with option-82 information from the edge switch.
The default setting is disabled.
Note Enter this command only on aggregation switches that are
connected to trusted devices.
Step 7
interface interface-id Specify the interface to be configured, and enter interface configuration
mode.

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Cisco Catalyst 3750-E Specifications

General IconGeneral
SeriesCatalyst 3750-E
Switching Capacity32 Gbps
Stacking Bandwidth32 Gbps
StackWise PlusYes
Layer SupportLayer 3
MAC Address Table Size12, 000 entries
RAM256 MB
Flash Memory64 MB
Memory256 MB DRAM, 64 MB Flash
Operating Temperature32 to 113°F (0 to 45°C)
Ports48 10/100/1000 Ethernet ports
Form FactorRack-mountable
Jumbo Frame SupportYes
Input Voltage100 to 240 VAC
Storage Temperature-25 to 70 °C
Relative Humidity10 to 90% non-condensing

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