Manual
Table Of Contents
- 1. INTRODUTION
- 2. INSTALLATION
- 3. SWITCH MANAGEMENT
- 4. WEB CONFIGURATION
- 4.1 Main WEB PAGE
- 4.2 System
- 4.3 Simple Network Management Protocol
- 4.4 Port Management
- 4.5 Link Aggregation
- 4.6 VLAN
- 4.7 Rapid Spanning Tree Protocol
- 4.8 Quality of Service
- 4.9 Multicast
- 4.10 IEEE 802.1X Network Access Control
- 4.10.1 Understanding IEEE 802.1X Port-Based Authentication
- 4.10.2 802.1X System Configuration
- 4.10.3 802.1X and MAC-Based Authentication Port Configuration
- 4.10.4 802.1X Port Status
- 4.10.5 802.1X and MAC-Based Authentication Statistics
- 4.10.6 Windows Platform RADIUS Server Configuration
- 4.10.7 802.1X Client Configuration
- 4.11 Access Control Lists
- 4.12 Address Table
- 4.13 Port Security (To be Continued)
- 4.14 LLDP
- 4.15 Network Diagnastics
- 4.16 Stacking – SGSW-24040 / SGSW-24040R
- 4.17 Power over Ethernet (SGSW-24040P / SGSW-24040P4)
- 5. COMMAND LINE INTERFACE
- 6. Command Line Mode
- 6.1 System Command
- 6.2 Port Management Command
- 6.3 Link Aggregation Command
- 6.4 VLAN Configuration Command
- 6.5 Spanning Tree Protocol Command
- 6.6 Multicast Configuration Command
- 6.7 Quality of Service Command
- 6.8 802.1x Port Access Control Command
- 6.9 Access Control List Command
- 6.10 MAC Address Table Command
- 6.11 LLDP Command
- 6.12 Stack Management Command
- 6.13 Power over Ethernet Command
- 7. SWITCH OPERATION
- 8. POWER OVER ETHERNET OVERVIEW
- 9. TROUBLE SHOOTING
- APPENDEX A
- APPENDEX B : GLOSSARY
User’s Manual of WGSW-24040 Series
SGSW-24040/24240 Series
97
normally.
Some relevant terms:
- Tagging - The act of putting 802.1Q VLAN information into the header of a packet.
- Untagging - The act of stripping 802.1Q VLAN information out of the packet header.
■ 802.1Q VLAN Tags
The figure below shows the 802.1Q VLAN tag. There are four additional octets inserted after the source MAC address. Their
presence is indicated by a value of 0x8100 in the Ether Type field. When a packet's Ether Type field is equal to 0x8100, the
packet carries the IEEE 802.1Q/802.1p tag. The tag is contained in the following two octets and consists of 3 bits of user priority,
1 bit of Canonical Format Identifier (CFI - used for encapsulating Token Ring packets so they can be carried across Ethernet
backbones), and 12 bits of VLAN ID (VID). The 3 bits of user priority are used by 802.1p. The VID is the VLAN identifier and is
used by the 802.1Q standard. Because the VID is 12 bits long, 4094 unique VLAN can be identified.
The tag is inserted into the packet header making the entire packet longer by 4 octets. All of the information originally contained
in the packet is retained.
802.1Q Tag
User Priority CFI
VLAN ID (VID)
3 bits 1 bits 12 bits
TPID (Tag Protocol Identifier) TCI (Tag Control Information)
2 bytes 2 bytes
Preamble Destination
Address
Source
Address
VLAN TAG
Ethernet
Type
Data FCS
6 bytes 6 bytes 4 bytes 2 bytes 46-1517 bytes 4 bytes
The Ether Type and VLAN ID are inserted after the MAC source address, but before the original Ether Type/Length or Logical
Link Control. Because the packet is now a bit longer than it was originally, the Cyclic Redundancy Check (CRC) must be
recalculated.