Tp-Link TL-SL2428 [51/140] Q vlan
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received untagge
d packets on the port and match the packets with the 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.
44
Содержание
- Ce mark warning 2
- Copyright trademarks 2
- Fcc statement 2
- Safety information 3
- Package contents 8
- Chapter 1 about this guide 9
- Conventions 9
- Intended readers 9
- Overview of this guide 9
- Appearance description 12
- Chapter 2 introduction 12
- Front panel 12
- Main features 12
- Overview of the switch 12
- The following parts are located on the front panel of the switch 12
- Rear panel 14
- Chapter 3 login to the switch 15
- Configuration 15
- Chapter 4 system 17
- System info 17
- System summary 17
- Device description 19
- The following entries are displayed on this screen 19
- Daylight saving time 20
- System time 20
- The following entries are displayed on this screen 20
- Select a predefined dst configuration 21
- The following entries are displayed on this screen 21
- System ip 22
- The following entries are displayed on this screen 22
- User config 23
- User manage 23
- User table 23
- The following entries are displayed on this screen 24
- Config backup 25
- Config restore 25
- System tools 25
- The following entries are displayed on this screen 25
- Firmware upgrade 26
- The following entries are displayed on this screen 26
- Access security 27
- System reboot 27
- System reset 27
- The following entries are displayed on this screen 28
- Chapter 5 switching 30
- Port config 30
- Port mirror 31
- The following entries are displayed on this screen 32
- The following entries are displayed on this screen 33
- Port security 34
- The following entries are displayed on this screen 35
- Port isolation 36
- The following entries are displayed on this screen 36
- Lag table 37
- The following entries are displayed on this screen 38
- Static lag 39
- The following entries are displayed on this screen 39
- The following entries are displayed on this screen 40
- Traffic monitor 40
- Traffic summary 40
- Traffic statistics 41
- The following entries are displayed on this screen 42
- Address table 43
- Mac address 43
- The following entries are displayed on this screen 44
- Static address 45
- The following entries are displayed on this screen 45
- Dynamic address 46
- The following entries are displayed on this screen 47
- Filtering address 48
- The following entries are displayed on this screen 48
- Chapter 6 vlan 50
- Q vlan 51
- The following entries are displayed on this screen 53
- Vlan config 53
- The following entries are displayed on this screen 54
- Port config 55
- The following entries are displayed on this screen 55
- The following entries are displayed on this screen 56
- Application example for 802 q vlan 57
- Chapter 7 spanning tree 59
- Stp config 64
- The following entries are displayed on this screen 65
- Stp summary 66
- Port config 67
- The following entries are displayed on this screen 68
- Mstp instance 69
- Region config 69
- Instance config 70
- The following entries are displayed on this screen 70
- Instance port config 71
- The following entries are displayed on this screen 71
- The following entries are displayed on this screen 72
- Port protect 73
- Stp security 73
- The following entries are displayed on this screen 75
- Application example for stp function 76
- Tc protect 76
- The following entries are displayed on this screen 76
- Chapter 8 multicast 80
- Igmp snooping 82
- Snooping config 83
- Port config 84
- The following entries are displayed on this screen 84
- The following entries are displayed on this screen 85
- Vlan config 85
- The following entries are displayed on this screen 86
- Multicast vlan 87
- The following entries are displayed on this screen 88
- Application example for multicast vlan 89
- Multicast ip 90
- Multicast ip table 90
- Static multicast ip 91
- The following entries are displayed on this screen 91
- Multicast filter 92
- The following entries are displayed on this screen 92
- Ip range 93
- The following entries are displayed on this screen 93
- Port filter 94
- The following entries are displayed on this screen 94
- Packet statistics 95
- The following entries are displayed on this screen 96
- Chapter 9 qos 97
- Diffserv 100
- Port priority 100
- The following entries are displayed on this screen 100
- P priority 101
- The following entries are displayed on this screen 101
- Dscp priority 102
- The following entries are displayed on this screen 103
- Bandwidth control 104
- Schedule mode 104
- The following entries are displayed on this screen 104
- Rate limit 105
- The following entries are displayed on this screen 105
- Storm control 106
- The following entries are displayed on this screen 106
- Chapter 10 snmp 108
- Global config 110
- Snmp config 110
- The following entries are displayed on this screen 110
- Snmp view 111
- The following entries are displayed on this screen 111
- Snmp group 112
- The following entries are displayed on this screen 112
- Snmp user 113
- The following entries are displayed on this screen 114
- Snmp community 115
- The following entries are displayed on this screen 115
- Notification 117
- The following entries are displayed on this screen 118
- Event config 120
- History control 120
- The following entries are displayed on this screen 120
- Alarm config 121
- The following entries are displayed on this screen 121
- The following entries are displayed on this screen 122
- Chapter 11 maintenance 124
- Cpu monitor 124
- System monitor 124
- Memory monitor 125
- Log table 126
- The following entries are displayed on this screen 126
- Local log 127
- Remote log 127
- The following entries are displayed on this screen 127
- Backup log 128
- The following entries are displayed on this screen 128
- Cable test 129
- Device diagnose 129
- The following entries are displayed on this screen 129
- The following entry is displayed on this screen 129
- Loopback 130
- Network diagnose 130
- The following entries are displayed on this screen 130
- The following entries are displayed on this screen 131
- Tracert 131
- The following entries are displayed on this screen 132
- Appendix a specifications 133
- Appendix b configuring the pcs 134
- Appendix c glossary 137
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