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Signamax 065-7931 16-Port 10/100/1000BaseT/TX WebSmart Switch
34
What if a VLAN tagging is applied?
VLAN tagging is a 4-byte long data string immediately following the MAC
source address. When tagged VLAN is applied, the Ethernet frame structure will
have a little change, shown as follows.
Only two fields, VLAN ID and Tag control information, are different in
comparison with the basic Ethernet frame. The rest of the fields are the same.
The first two bytes are the VLAN type ID with the value of 0x8100 indicating
the received frame is a tagged VLAN frame, and the next two bytes are Tag Control
Information (TCI), used to provide user priority, and VLAN ID, which are explained
respectively in the following table.
Bits 15-13
User Priority 7-0, 0 is lowest priority
Bit 12
CFI (Canonical Format Indicator)
1: RIF field is present in the tag header
0: No RIF field is present
Bits 11-0
VID (VLAN Identifier)
0x000: Null VID. No VID is present and only user
priority is present.
0x001: Default VID
0xFFF: Reserved
Table 3-5
Note: RIF is used in Token Ring network to provide source routing and comprises
two fields, Routing Control and Route Descriptor.
When MAC parses the received frame and finds a reserved special value
0x8100 at the location of the Length/Type field of the normal non-VLAN frame, it will
interpret the received frame as a tagged VLAN frame. If this happens in a switch,
the MAC will forward it, according to its priority and egress rule, to all the ports that
are associated with that VID. If it happens in a network interface card, the MAC will
deprive the frame of the tag header and process it in the same way as a basic
normal frame. For a VLAN-enabled LAN, all involved devices must be equipped
with the optional VLAN function.
At operating speeds above 100 Mbps, the slotTime employed at slower
speeds is inadequate to accommodate network topologies of the desired physical
extent. Carrier Extension provides a means by which the slotTime can be increased
to a sufficient value for the desired topologies, without increasing the minFrameSize
parameter, as this would have deleterious effects. Nondata bits, referred to as
extension bits, are appended to frames that are less than slotTime bits in length so
that the resulting transmission is at least one slotTime in duration. Carrier Extension
can be performed only if the underlying physical layer is capable of sending and
receiving symbols that are readily distinguished from data symbols, as is the case in
most physical layers that use a block encoding/decoding scheme.
- U s e r’s G u i d e 1
- Table of Contents 4
- Revision History 6
- About this user’s manual 9
- 1. Introduction 10
- 1-2. Checklist 11
- 1-3. Features 11
- 2. Installation 16
- 2-1-2. Cabling Requirements 17
- 18
- Ethernet LAN 23
- 2-1-4. IP Address Assignment 24
- 1 0000000 26
- 1 1111111 26
- Fig. 2-9 28
- 2-2. Typical Applications 29
- 3. Basic Concept and 31
- Management 31
- Table 3-2 33
- Table 3-1 LLC Format 33
- Fig. 3-2 SAP Format 34
- How does a MAC work? 37
- 64 bytes 38
- 3-3. Flow Control 40
- Table 3-5 42
- Fig.3-5 Collision Domain 44
- Fig. 3-6 45
- 3-5. Virtual LAN 47
- Fig. 3-8 48
- Fig.3-9 Tag Format 49
- Table 3-6 52
- Table 3-7 52
- 3-6. Link Aggregation 53
- 4. Operation of 55
- Web-based Management 55
- Page Layout Information 57
- 4-2. Configuration 58
- 4-2-1. System Configuration 59
- 4-2-2. Ports Configuration 62
- Fig. 4-4 63
- Fig. 4-5 65
- Fig. 4-7 68
- Fig. 4-8 68
- Fig. 4-9 69
- ;). Untag means the outgoing 70
- Fig. 4-10 71
- Fig. 4-11 72
- ;) under the 73
- Fig. 4-13 74
- Fig. 4-14 75
- Fig. 4-15 77
- Fig. 4-16 Advanced Mode 81
- Fig. 4-17 Simple Mode 81
- Fig. 4-18 82
- 4-2-9. Bandwidth Management 83
- Fig. 4-20 85
- 4-2-11. Max. Packet Length 86
- 4-3. Monitoring 87
- 4-3-2. Detailed Statistics 88
- Fig. 4-23 90
- 4-4-1. Status 91
- Fig. 4-25 94
- Fig. 4-27 Tag-based VLAN 97
- Fig. 4-31 100
- Fig. 4-32 101
- 4-4-2. Warm Restart 102
- 4-4-3. Factory Default 103
- 4-4-4. Logout 104
- 5. Maintenance 105
- Technical Specifications 106
- Appendix A 106
- Hardware Specifications 107
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