TP-Link TL-SG5412F User Manual

received
untagged packets on the port and match the packets with the Protocol VLAN and 802.1Q
VLAN in turn. If a packet is matched, the switch will add a corresponding VLAN tag to it and
forward it in the corresponding VLAN.
6.1 802.1Q VLAN
VLAN tags in the packets are necessary for the switch to identify packets of different VLANs. The
switch works at the data link layer in OSI model and it can identify the data link layer encapsulation
of the packet only, so you can add the VLAN tag field into the data link layer encapsulation for
identification.
In 1999, IEEE issues the IEEE 802.1Q protocol to standardize VLAN implementation, defining the
structure of VLAN-tagged packets. IEEE 802.1Q protocol defines that a 4-byte VLAN tag is
encapsulated after the destination MAC address and source MAC address to show the information
about VLAN.
As shown in the following figure, a VLAN tag contains four fields, including TPID (Tag Protocol
Identifier), Priority, CFI (Canonical Format Indicator), and VLAN ID.
Figure 6-2 Format of VLAN Tag
（1） TPID: TPID is a 16-bit field, indicating that this data frame is VLAN-tagged. By default, it is
0x8100.
（2） Priority: Priority is a 3-bit field, referring to 802.1p priority. Refer to section “QoS & QoS
profile” for details.
（3） CFI: CFI is a 1-bit field, indicating whether the MAC address is encapsulated in the
standard format in different transmission media. This field is not described in detail in this
chapter.
（4） VLAN ID: VLAN ID is a 12-bit field, indicating the ID of the VLAN to which this packet
belongs. It is in the range of 0 to 4,095. Generally, 0 and 4,095 is not used, so the field is in
the range of 1 to 4,094.
VLAN ID identifies the VLAN to which a packet belongs. When the switch receives an
un-VLAN-tagged packet, it will encapsulate a VLAN tag with the default VLAN ID of the inbound
port for the packet, and the packet will be assigned to the default VLAN of the inbound port for
transmission.
In this User Guide, the tagged packet refers to the packet with VLAN tag whereas the untagged
packet refers to the packet without VLAN tag, and the priority-tagged packet refers to the packet
with VLAN tag whose VLAN ID is 0.
 Link Types of ports
When creating the 802.1Q VLAN, you should set the link type for the port according to its
connected device. The link types of port including the following three types:
（1） ACCESS: The ACCESS port can be added in a single VLAN, and the egress rule of the
port is UNTAG. The PVID is same as the current VLAN ID. If the ACCESS port is added to
another VLAN, it will be removed from the current VLAN automatically.
52

TP-Link TL-SG5412F Specifications

General

MAC address table	8000 entries
Jumbo frames support	Yes
Maximum data transfer rate	1 Gbit/s
Supported data transfer rates	10, 100, 1000Mbps
Fan	0
Wi-Fi	No
Diagnostics	VCT
Management platform	SNMP, RMON, WEB/CLI/Telnet
Authentication method	802.1X, Radius
Packet transfer speed	17.99Mpps
Connectivity technology	Wired
Networking standards	IEEE 802.1D, IEEE 802.1p, IEEE 802.1Q, IEEE 802.1s, IEEE 802.1w, IEEE 802.1x, IEEE 802.3, IEEE 802.3ab, IEEE 802.3ad, IEEE 802.3i, IEEE 802.3u, IEEE 802.3x, IEEE 802.3z
Ethernet LAN data rates	10, 100, 1000 Mbit/s
Copper ethernet cabling technology	1000BASE-T, 100BASE-TX, 10BASE-T
DHCP features	DHCP client
Security algorithms	SSH, SSL/TLS
Switch type	Managed
Switch layer	L2
Console port	RJ-45
Fiber optic connector	SFP
SFP/SFP+ slots quantity	12
Basic switching RJ-45 Ethernet ports quantity	4
Fiber ethernet cabling technology	100BASE-FX
AC input voltage	100 - 240 V
AC input frequency	50 - 60 Hz
Stackable	-
Form factor	1U
Certification	CE, FCC
Product color	Black
Compatible operating systems	Windows 98SE, NT, 2000, XP, Vista, Windows 7\\r MAC OS\\r NetWare\\r UNIX\\r Linux
Storage temperature (T-T)	-40 - 70 °C
Operating temperature (T-T)	0 - 40 °C
Storage relative humidity (H-H)	5 - 90 %
Operating relative humidity (H-H)	10 - 90 %

Weight and Dimensions

Depth	260 mm
Width	440 mm
Height	44 mm