Cisco 500 Series Administration Manual page 366

IP Configuration
IPv4 Management and Interfaces
STEP 2
STEP 3
STEP 4
STEP 1
STEP 2
STEP 3
STEP 4
STEP 1
STEP 2
STEP 3
STEP 4
Cisco 500 Series Managed Switch Administration Guide
Click Apply. The settings are written to the Running Configuration file.
To define a DHCP server, click Add.
Enter the IP address of the DHCP server and click Apply. The settings are written
to the Running Configuration file.
Interface Settings
In Layer 2, DHCP Relay and Snooping can only be enabled on VLANs with IP
addresses.
In Layer 3, DHCP Relay and Snooping can be enabled on any interface with an IP
address and on VLANs with or without an IP address.
To enable DHCP Snooping/Relay on specific interfaces:
Click IP Configuration > IPv4 Management and Interfaces > DHCP Snooping/
Relay > Interface Settings.
To enable DHCP Relay or DHCP Snooping on an interface, click ADD.
Select the interface and the features to be enabled: DHCP Relay or DHCP
Snooping.
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.
To designate an interface as untrusted:
Click IP Configuration > IPv4 Management and Interfaces > DHCP Snooping/
Relay > DHCP Snooping Trusted Interfaces.
Select the interface and click Edit.
Select Trusted Interface (Yes or No).
Click Apply to save the settings to the Running Configuration file.
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