TP-Link TL-SG2424P TL-SG2424P V1 User Guide 1910010774 - Page 63

with 802.1Q VLAN. 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.

（

2

）

TRUNK:

The TRUNK port can be added in multiple VLANs, and the egress rule of the port

is TAG. The TRUNK port is generally used to connect the

cascaded

network devices for it

55

Section	Page
Package Contents	9
Chapter 1 About this Guide	10
1.1 Intended Readers	10
1.2 Conventions	10
1.3 Overview of This Guide	10
Chapter 2 Introduction	13
2.1 Overview of the Switch	13
2.2 Main Features	13
2.3 Appearance Description	14
2.3.1 Front Panel	14
2.3.2 Rear Panel	15
Chapter 3 Login to the Switch	16
3.1 Login	16
3.2 Configuration	16
Chapter 4 System	18
4.1 System Info	18
4.1.1 System Summary	18
4.1.2 Device Description	20
4.1.3 System Time	20
4.1.4 Daylight Saving Time	21
4.1.5 System IP	23
4.2 User Management	24
4.2.1 User Table	24
4.2.2 User Config	24
4.3 System Tools	26
4.3.1 Config Restore	26
4.3.2 Config Backup	26
4.3.3 Firmware Upgrade	27
4.3.4 System Reboot	28
4.3.5 System Reset	28
4.4 Access Security	28
4.4.1 Access Control	29
4.4.2 SSL Config	30
4.4.3 SSH Config	31
Chapter 5 Switching	37
5.1 Port	37
5.1.1 Port Config	37
5.1.2 Port Mirror	38
5.1.3 Port Security	40
5.1.4 Port Isolation	42
5.1.5 Loopback Detection	43
5.2 LAG	44
5.2.1 LAG Table	45
5.2.2 Static LAG	46
5.2.3 LACP Config	47
5.3 Traffic Monitor	49
5.3.1 Traffic Summary	49
5.3.2 Traffic Statistics	50
5.4 MAC Address	52
5.4.1 Address Table	53
5.4.2 Static Address	54
5.4.3 Dynamic Address	55
5.4.4 Filtering Address	57
5.5 DHCP Filtering	58
Chapter 6 VLAN	62
6.1 802.1Q VLAN	63
6.1.1 VLAN Config	65
6.1.2 Port Config	67
6.2 Application Example for 802.1Q VLAN	69
Chapter 7 Spanning Tree	71
7.1 STP Config	76
7.1.1 STP Config	76
7.1.2 STP Summary	78
7.2 Port Config	78
7.3 MSTP Instance	80
7.3.1 Region Config	80
7.3.2 Instance Config	81
7.3.3 Instance Port Config	82
7.4 STP Security	84
7.4.1 Port Protect	84
7.4.2 TC Protect	87
7.5 Application Example for STP Function	87
Chapter 8 Multicast	91
8.1 IGMP Snooping	93
8.1.1 Snooping Config	94
8.1.2 Port Config	95
8.1.3 VLAN Config	96
8.1.4 Multicast VLAN	98
8.2 Multicast IP	101
8.2.1 Multicast IP Table	101
8.2.2 Static Multicast IP	102
8.3 Multicast Filter	103
8.3.1 IP-Range	103
8.3.2 Port Filter	104
8.4 Packet Statistics	106
Chapter 9 QoS	108
9.1 DiffServ	111
9.1.1 Port Priority	111
9.1.2 DSCP Priority	112
9.1.3 802.1P/CoS mapping	113
9.1.4 Schedule Mode	114
9.2 Bandwidth Control	115
9.2.1 Rate Limit	115
9.2.2 Storm Control	116
9.3 Voice VLAN	118
9.3.1 Global Config	120
9.3.2 Port Config	120
9.3.3 OUI Config	122
Chapter 10 PoE	124
10.1 PoE Config	124
10.1.1 PoE Config	125
10.1.2 PoE Profile	126
10.2 PoE Time-Range	127
10.2.1 Time-Range Summary	127
10.2.2 PoE Time-Range Create	128
10.2.3 PoE Holiday Config	129
Chapter 11 SNMP	130
11.1 SNMP Config	132
11.1.1 Global Config	132
11.1.2 SNMP View	133
11.1.3 SNMP Group	134
11.1.4 SNMP User	135
11.1.5 SNMP Community	137
11.2 Notification	139
11.3 RMON	141
11.3.1 History Control	142
11.3.2 Event Config	142
11.3.3 Alarm Config	143
Chapter 12 LLDP	146
12.1 Basic Config	150
12.1.1 Global Config	150
12.1.2 Port Config	151
12.2 Device Info	152
12.2.1 Local Info	152
12.2.2 Neighbor Info	153
12.3 Device Statistics	153
12.4 LLDP-MED	155
12.4.1 Global Config	156
12.4.2 Port Config	156
12.4.3 Local Info	158
12.4.4 Neighbor Info	159
Chapter 13 Maintenance	161
13.1 System Monitor	161
13.1.1 CPU Monitor	161
13.1.2 Memory Monitor	162
13.2 Log	162
13.2.1 Log Table	163
13.2.2 Local Log	164
13.2.3 Remote Log	165
13.2.4 Backup Log	165
13.3 Device Diagnostics	166
13.3.1 Cable Test	166
13.3.2 Loopback	167
13.4 Network Diagnostics	168
13.4.1 Ping	168
13.4.2 Tracert	168
Appendix A: Specifications	170
Appendix B: Configuring the PCs	171

TP-Link TL-SG2424P TL-SG2424P V1 User Guide 1910010774 - Page 63

Q Vlan

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