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24-Port Gigabit (Hi-Power) PoE+ Ethernet Smart Managed Pro Switch with 2 SFP Ports
Configure System Information User Manual119
Configure DHCP snooping
DHCP snooping is a useful feature that provides security by filtering untrusted DHCP
messages and by building and maintaining a DHCP snooping binding table. An untrusted
message is a message that is received from outside the network or firewall and that can
cause traffic attacks within your network. The DHCP snooping binding table contains the
MAC address, IP address, lease time, binding type, VLAN number, and interface information
that corresponds to the local untrusted interfaces of a switch. An untrusted interface is an
interface that is configured to receive messages from outside the network or firewall. A
trusted interface is an interface that is configured to receive only messages from within the
network.
DHCP snooping acts like a firewall between untrusted hosts and DHCP servers. It also
provides way to dif
ferentiate between untrusted interfaces conn
ected to the end user and
trusted interfaces connected to the DHCP server or another switch.
Location Information
Civic The physical location, such as the street address, that the remote device
advertised in the location TL
V, for example, 123 45th St. E. The field value
length range is 6–160 characters.
Coordinates The location map coordinates that the remote device advertised in the
location
TL
V, including latitude, longitude, and altitude.
ECS ELIN The Emergency Call Service (ECS) Emergency Location Identification
Number (ELIN) that the remote device advertised in the location TL
V. The
field range is 10–25.
Unknown Displays unknown location information for the remote device.
Network Policies
Application Type The media application type associated with the policy advertised by the
remote device.
VLAN ID The VLAN ID associated with the policy.
VLAN Type Specifies whether the VLAN associated with the policy is tagged
or
untagged.
User Priority The priority associated with the policy.
DSCP The DSCP associated with a particular policy type.
LLDP Unknown TLVs
Type The unknown TLV type field.
Value
The unknown TLV value field.
Field Description
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