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A VLAN tag includes the following fields:
• TPID—16-bit tag protocol identifier that indicates whether a frame is VLAN-tagged. By default, the
TPID value 0x8100 identifies a VLAN-tagged frame. A device vendor can set TPID to different
values. For compatibility with a neighbor device, configure the TPID value on the device to be the
same as the neighbor device.
• Priority—3-bit long, identifies the 802.1p priority of the frame. For more information, see ACL and
QoS Configuration Guide.
• CFI—1-bit long canonical format indicator that indicates whether the MAC addresses are
encapsulated in the standard format when packets are transmitted across different media.
Available values include:
{ 0 (default)—The MAC addresses are encapsulated in the standard format.
{ 1—The MAC addresses are encapsulated in a nonstandard format.
This field is always set to 0 for Ethernet.
• VLAN ID—12-bit long, identifies the VLAN to which the frame belongs. The VLAN ID range is 0 to
4095. VLAN IDs 0 and 4095 are reserved, and VLAN IDs 1 to 4094 are user configurable.
The way a network device handles an incoming frame depends on whether the frame has a VLAN-tag
and the value of the VLAN tag (if any). For more information, see "Introduction."
Ethernet supports encapsulation formats Ethernet II, 802.3/802.2 LLC, 802.3/802.2 SNAP, and 802.3
raw. The Ethernet II encapsulation format is used here. For information about the VLAN tag fields in other
frame encapsulation formats, see related protocols and standards.
For a frame with multiple VLAN tags, the device handles it according to its outer-most VLAN tag and
transmits its inner VLAN tags as the payload.
Protocols and standards
IEEE 802.1Q, IEEE Standard for Local and Metropolitan Area Networks: Virtual Bridged Local Area
Networks
Configuring basic VLAN settings
Ste
p
Command
Remarks
1. Enter system view.
system-view N/A
2. (Optional.) Create a
VLAN and enter its view,
or create a list of VLANs.
vlan { vlan-id1 [ to vlan-id2 ] |
all }
By default, only the system default VLAN
(VLAN 1) exists.
3. Enter VLAN view.
vlan vlan-id
To configure a VLAN after you create a list
of VLANs, you must perform this step.
4. Configure a name for
the VLAN.
name text
By default, VLAN names are in the format
VLAN vlan-id. For example, the name of
VLAN 100 is VLAN 0100 by default.
5. Configure the
description of the VLAN.
description text
The default setting is VLAN vlan-id, which is
the ID of the VLAN. For example, the
description of VLAN 100 is VLAN 0100 by
default.
- H3C S5560-EI Switch Series 1
- Preface 3
- Symbols 4
- Network topology icons 4
- GUI conventions 4
- Port numbering in examples 5
- Obtaining documentation 6
- Technical support 6
- Documentation feedback 6
- Contents 7
- S5560-30F-EI switches) 16
- { Accepts the packet 22
- Configuration guidelines 25
- Step Command Remarks 31
- Task Command 31
- Configuring a null interface 33
- Bulk configuring interfaces 35
- Overview 37
- Types of MAC address entries 38
- Configuring MAC Information 52
- Basic concepts 56
- Operational key 57
- Configuration types 57
- Link aggregation modes 58
- Choosing a reference port 58
- LACP functions 60
- LACP operating modes 60
- LACP priorities 60
- LACP timeout interval 61
- Edge aggregate interface 63
- Step Command Remarks 67
- Ethernet link aggregation 77
- Configuring port isolation 91
- STP protocol packets 94
- Basic concepts in STP 95
- Description 96
- Example of STP calculation 98
- STP timers 102
- MSTP features 103
- MSTP basic concepts 104
- Regional root 106
- Common root bridge 106
- Port roles 106
- How MSTP works 107
- Protocols and standards 108
- STP configuration task list 109
- RSTP configuration task list 110
- PVST configuration task list 111
- MSTP configuration task list 112
- Configuring an MST region 113
- Configuration procedure 118
- Configuring edge ports 119
- Configuration example 123
- Performing mCheck 127
- Configuring Digest Snooping 128
- Network requirements 129
- <DeviceB> system-view 130
- Configuration prerequisites 131
- Configuring TC Snooping 132
- Enabling BPDU guard 134
- Enabling root guard 134
- Enabling loop guard 135
- Enabling TC-BPDU guard 137
- Enabling BPDU drop 137
- MSTP configuration example 138
- Verifying the configuration 141
- PVST configuration example 142
- Configuring loop detection 146
- Loop detection interval 147
- Loop protection actions 147
- Enabling loop detection 148
- Configuring VLANs 154
- Configuring port-based VLANs 157
- Configuring MAC-based VLANs 161
- Configuring a VLAN group 169
- VLAN configuration examples 170
- Configuring super VLANs 179
- Untagged ports: 184
- Configuring the private VLAN 185
- [DeviceB] vlan 5 189
- [DeviceB-vlan5] quit 189
- Configuring voice VLANs 202
- IP phone access methods 204
- Voice VLAN assignment modes 205
- Configuring MVRP 217
- Join message 218
- New message 218
- Leave message 218
- MRP timers 219
- MVRP registration modes 220
- MVRP configuration task list 220
- Enabling MVRP 221
- Configuring MRP timers 222
- Enabling GVRP compatibility 223
- MVRP configuration example 224
- Configuring QinQ 235
- QinQ implementations 236
- Restrictions and guidelines 237
- Enabling QinQ 237
- Configuring the CVLAN TPID 239
- Configuring the SVLAN TPID 239
- QinQ configuration examples 241
- Configuring VLAN mapping 246
- Distribution 247
- VLAN mapping implementations 248
- Network-side port 249
- Customer-side port 249
- Uplink traffic 249
- Downlink traffic 249
- One-to-two VLAN mapping 250
- Two-to-two VLAN mapping 250
- Two-to-two VLAN 251
- Configuration task list 253
- Enabling DHCP snooping 253
- Enabling ARP detection 253
- Enabling ARP snooping 256
- Configuring LLDP 267
- LLDP frame formats 268
- LLDPDUs 269
- Working mechanism 272
- LLDP configuration task list 274
- Enabling LLDP polling 276
- LLDP configuration examples 284
- Verify the configuration: 285
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