Planet GS-4210-16T2S User Manual

User’s Manual of GS-4210-16T2S_24T2S_16P2S_24P2S_48T4S
259
 If DHCP snooping is enabled globally, and also enabled on the VLAN where the DHCP packet is received, all DHCP
packets are forwarded for a trusted port. If the received packet is a DHCP ACK message, a dynamic DHCP
snooping entry is also added to the binding table.
 If DHCP snooping is enabled globally, and also enabled on the VLAN where the DHCP packet is received, but the
port is not trusted, it is processed as follows:
 If the DHCP packet is a reply packet from a DHCP server (including OFFER, ACK or NAK messages),
the packet is dropped.
 If the DHCP packet is from a client, such as a DECLINE or RELEASE message, the switch forwards the
packet only if the corresponding entry is found in the binding table.
 If the DHCP packet is from a client, such as a DISCOVER, REQUEST, INFORM, DECLINE or
RELEASE message, the packet is forwarded if MAC address verification is disabled. However, if MAC
address verification is enabled, then the packet will only be forwarded if the client’s hardware address
stored in the DHCP packet is the same as the source MAC address in the Ethernet header.
 If the DHCP packet is not a recognizable type, it is dropped.
• If a DHCP packet from a client passes the filtering criteria above, it will only be forwarded to trusted ports in the same VLAN.
• If a DHCP packet is from server is received on a trusted port, it will be forwarded to both trusted and untrusted ports in the
same VLAN.
• If the DHCP snooping is globally disabled, all dynamic bindings are removed from the binding table.
 Additional considerations when the switch itself is a DHCP client – The port(s) through which the switch submits a
client request to the DHCP server must be configured as trusted. Note that the switch will not add a dynamic entry
for itself to the binding table when it receives an ACK message from a DHCP server. Also, when the switch sends
out DHCP client packets for itself, no filtering takes place. However, when the switch receives any messages from a
DHCP server, any packets received from untrusted ports are dropped.
4.9.3.2 Global Setting
DHCP Snooping is used to block intruder on the untrusted ports of switch when it tries to intervene by injecting a bogus DHCP
reply packet to a legitimate conversation between the DHCP client and server. Configure DHCP Snooping on this page. The
DHCP Snooping Setting and Information screens in Figure 4-9-14 and Figure 4-9-15 appear.
Figure 4-9-14: DHCP Snooping Setting Page Screenshot

Planet GS-4210-16T2S Specifications

General

Switch type	Managed
Switch layer	L2/L4
Quality of Service (QoS) support	Yes
Console port	RJ-45
SFP module slots quantity	2
Installed SFP modules quantity	0
Basic switching RJ-45 Ethernet ports type	Gigabit Ethernet (10/100/1000)
Basic switching RJ-45 Ethernet ports quantity	16
10G support	No
Number of VLANs	4094
Networking standards	IEEE 802.1D, IEEE 802.1Q, IEEE 802.1ab, IEEE 802.1p, IEEE 802.1s, IEEE 802.1w, IEEE 802.1x, IEEE 802.3, IEEE 802.3ab, IEEE 802.3ad, IEEE 802.3u, IEEE 802.3x, IEEE 802.3z
Virtual LAN features	Stacked VLAN, Private VLAN, Tagged VLAN, Protocol-based VLAN
Copper ethernet cabling technology	10BASE-T, 100BASE-TX, 1000BASE-T
Authentication	Port-based authentication
Security algorithms	802.1x RADIUS, HTTPS, SSH, SSL/TLS
Stackable	-
Form factor	1U
Certification	FCC, CE
Product color	Blue
Housing material	Metal
Throughput	26.7 Mpps
Jumbo frames	9216
MAC address table	8000 entries
Supported network protocols	IPv4 / IPv6
Input current	0.8 A
AC input voltage	100 - 240 V
AC input frequency	50 - 60 Hz
Power consumption (max)	10.4 W
Heat dissipation	35 BTU/h
Storage temperature (T-T)	-10 - 70 °C
Operating temperature (T-T)	0 - 50 °C
Operating relative humidity (H-H)	5 - 95 %
Fiber ethernet cabling technology	1000BASE-X
Harmonized System (HS) code	85176990

Weight and Dimensions

Depth	207 mm
Width	445 mm
Height	45 mm
Weight	2000 g