IP Configuration
IPv4 Management and Interfaces
Cisco 350, 350X and 550X Series Managed Switches, Firmware Release 2.4, ver 0.4
301
16
•
DHCP Relay
—Select to enable DHCP Relay.
•
DHCP Snooping Status
—Select to enable DHCP Snooping.
•
Option 82 Pass Through
—Select to leave foreign Option 82 information when
forwarding packets.
•
Verify MAC Address
—Select to verify that the source MAC address of the Layer 2
header matches the client hardware address as appears in the DHCP Header (part of the
payload) on DHCP untrusted ports.
•
Backup Database
—Select to back up the DHCP Snooping Binding database on the
device’s flash memory.
STEP 2
Click
Apply
. The settings are written to the Running Configuration file.
STEP 3
To define a DHCP server, click
Add
.
STEP 4
Enter the IP address of the DHCP server and click
Apply
. The settings are written to the
Running Configuration file.
Interface Settings
DHCP Relay and Snooping can be enabled on any interface or VLAN. For DHCP relay to be
functional, an IP address must be configured on the VLAN or interface.
To enable DHCP Snooping/Relay on specific interfaces:
STEP 1
Click
IP Configuration > IPv4 Management and Interfaces > DHCP Snooping/Relay >
Interface Settings.
STEP 2
To enable DHCP Relay or DHCP Snooping on an interface, click
ADD
.
STEP 3
Select the interface and the features to be enabled:
DHCP Relay
or
DHCP Snooping
or both.
STEP 4
Click
Apply
. The settings are written to the Running Configuration file.
DHCP Snooping Trusted Interfaces
Packets from untrusted ports/LAGs are checked against the DHCP Snooping Binding database
(see the
DHCP Snooping Binding Database
page).
By default, interfaces are trusted.
