HP V1910 User Manual

288
DHCP snooping configuration
NOTE:
A DHCP snooping enabled device does not work if it is between the DHCP relay agent and DHCP
server, and it can work when it is between the DHCP client and relay agent or between the DHCP clien
t
and server.
HP recommends you not to to enable the DHCP client, BOOTP client, and DHCP snoopin
g
on the same
device. Otherwise, DHCP snoopin
g
entries may fail to be
g
enerated, or the BOOTP client/DHCP clien
t
may fail to obtain an IP address.
DHCP snooping overview
Functions of DHCP snooping
As a DHCP security feature, DHCP snooping can implement the following:
Table 85 Recording IP-to-MAC mappings of DHCP clients
Table 86 Ensuring DHCP clients to obtain IP addresses from authorized DHCP servers
Recording IP-to-MAC mappings of DHCP clients
DHCP snooping reads DHCP-REQUEST messages and DHCP-ACK messages from trusted ports to record
DHCP snooping entries, including MAC addresses of clients, IP addresses obtained by the clients, ports that
connect to DHCP clients, and VLANs to which the ports belong.
Ensuring DHCP clients to obtain IP addresses from authorized DHCP servers
If there is an unauthorized DHCP server on a network, DHCP clients may obtain invalid IP addresses and
network configuration parameters, and cannot normally communicate with other network devices. With
DHCP snooping, the ports of a device can be configured as trusted or untrusted, ensuring the clients to
obtain IP addresses from authorized DHCP servers.
 Trusted: A trusted port forwards DHCP messages normally.
 Untrusted: An untrusted port discards the DHCP-ACK or DHCP-OFFER messages received from any
DHCP server.

HP V1910 Specifications

General

Switching Capacity	56 Gbps
Forwarding Rate	41.7 Mpps
Manageable	Yes
Form Factor	Rack-mountable
Features	VLAN, QoS, Link Aggregation
Operating Temperature	0°C to 45°C
Operating Humidity	10% to 90% (non-condensing)
Ports	24 x 10/100/1000 + 4 x SFP