Planet IGS-20040MT User Manual

User’s Manual of IGS-20040MT
4.2.9 DHCP Relay
Configure DHCP Relay on this Page. DHCP Relay is used to forward and to transfer DHCP messages between the clients and
the server when they are not on the same subnet domain.
The DHCP option 82 enables a DHCP relay agent to insert specific information into a DHCP request packets when forwarding
client DHCP packets to a DHCP server and remove the specific information from a DHCP reply packets when forwarding server
DHCP packets to a DHCP client. The DHCP server can use this information to implement IP address or other assignment
policies. Specifically the option works by setting two sub-options:
 Circuit ID (option 1)
 Remote ID (option2).
The Circuit ID sub-option is supposed to include information specific to which circuit the request came in on.
The Remote ID sub-option was designed to carry information relating to the remote host end of the circuit.
The definition of Circuit ID in the switch is 4 bytes in length and the format is "vlan_id" "module_id" "port_no". The parameter of
"vlan_id" is the first two bytes representing the VLAN ID. The parameter of "module_id" is the third byte for the module ID (in
standalone switch it always equals 0; in stackable switch it means switch ID). The parameter of "port_no" is the fourth byte and it
means the port number.
The Remote ID is 6 bytes in length, and the value equals the DHCP relay agent’s MAC address. The DHCP Relay Configuration
screen in Figure 4-2-12 appears.
Figure 4-2-12 DHCP Relay
Configuration Page Screenshot
The Page includes the following fields:
Object Description
 Relay Mode
Indicates the DHCP relay mode operation. Possible modes are:
 Enabled: Enable DHCP relay mode operation. When enabling DHCP relay
mode operation, the agent forwards and transfers DHCP messages between
the clients and the server when they are not on the same subnet domain.
And the DHCP broadcast message won't flood for security considered.
 Disabled: Disable DHCP relay mode operation.
 Relay Server
Indicates the DHCP relay server IP address. A DHCP relay agent is used to
forward and transfer DHCP messages between the clients and the server when
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Planet IGS-20040MT Specifications

General

Switch type	Managed
Switch layer	L2+
Traffic classification	Yes
Console port	RJ-45
Fiber optic connector	MiniGBIC
SFP module slots quantity	4
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	4095
Networking standards	IEEE 1588v2, IEEE 802.1D, IEEE 802.1Q, IEEE 802.1ab, IEEE 802.1ad, IEEE 802.1ag, IEEE 802.1p, IEEE 802.1s, IEEE 802.1w, IEEE 802.1x, IEEE 802.3, IEEE 802.3ab, IEEE 802.3ad, IEEE 802.3ah, 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
Stackable	-
Certification	FCC, CE
Product color	Blue, White
Housing material	Aluminum
International Protection (IP) code	IP30
Fiber ethernet cabling technology	100BASE-FX, 1000BASE‑BX, 1000BASE‑LX, 1000BASE‑SX
Throughput	29.7 Mpps
Jumbo frames	9216
MAC address table	8000 entries
Number of IP interfaces	8
Power consumption (max)	17 W
Power consumption (typical)	8 W
Heat dissipation	27 BTU/h
Storage temperature (T-T)	-40 - 85 °C
Operating temperature (T-T)	-40 - 75 °C
Operating relative humidity (H-H)	5 - 95 %
Supported network protocols	IPv4 / IPv6
Authentication	MAC-based authentication, Port-based authentication
Security algorithms	802.1x RADIUS, SSH, SSL/TLS
Number of multicast groups filtered	255
Harmonized System (HS) code	85176990

Weight and Dimensions

Depth	107.3 mm
Width	76.8 mm
Height	152 mm
Weight	1043 g