25-12
Cisco IE 2000 Switch Software Configuration Guide
OL-25866-01
Chapter 25 Configuring DHCP
How to Configure DHCP
Enabling the DHCP Snooping Binding Database Agent
Step 7
interface interface-id Specifies the interface to be configured, and enters interface
configuration mode.
Step 8
ip dhcp snooping vlan vlan information
option format-type circuit-id
[override] string ASCII-string
(Optional) Configures the circuit-ID suboption for the specified
interface.
Specifies the VLAN and port identifier, using a VLAN ID in the range of
1
to 4096. The default circuit ID is the port identifier in the format
vlan-mod-port.
You can configure the circuit ID to be a string of 3 to 63 ASCII characters
(no spaces).
(Optional) Use the override keyword when you do not want the
circuit-ID suboption inserted in TLV format to define subscriber
information.
Step 9
ip dhcp snooping trust (Optional) Configures the interface as trusted or as untrusted. Use the no
keyword to configure an interface to receive messages from an untrusted
client. The default setting is untrusted.
Step 10
ip dhcp snooping limit rate rate (Optional) Configures the number of DHCP packets per second that an
interface can receive. The range is 1 to 2048. By default, no rate limit is
configured.
Note We recommend an untrusted rate limit of not more than 100
packets per second. If you configure rate limiting for trusted
interfaces, you might need to increase the rate limit if the port is
a trunk port assigned to more than one VLAN with DHCP
snooping.
Step 11
exit Returns to global configuration mode.
Step 12
ip dhcp snooping verify mac-address (Optional) Configures the switch to verify that the source MAC address
in a DHCP packet received on untrusted ports matches the client
hardware address in the packet. The default is to verify that the source
MAC address matches the client hardware address in the packet.
Step 13
end Returns to privileged EXEC mode.
Command Purpose
Step 1
configure terminal Enters global configuration mode.
Step 2
ip dhcp snooping database
{flash:/filename |
ftp://user:password@host/filename |
http://[[username:password]@]{hostna
me | host-ip}[/directory]
/image-name.tar |
rcp://user@host/filename}|
tftp://host/filename
Specifies the URL for the database agent or the binding file by using one
of these forms:
• flash:/filename
• ftp://user:password@host/filename
• http://[[username:password]@]{hostname | host-ip}[/directory]
/image-name.tar
• rcp://user@host/filename
• tftp://host/filename
Command Purpose
