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3-12 AT-8600 Series Software Reference
Software Release 2.6.4
C613-03081-00 REV A
Table 3-2 on page 3-12 lists the meaning and use of the fields in the Ethernet
frame. Figure 3-1 on page 3-12 shows the format of VLAN data in an Ethernet
frame. Twelve bits of the tag are the VLAN Identifier (VID), which indicates the
VLAN to which the packet belongs. Table 3-3 on page 3-12 lists the VLAN
Identifier values that have specific meaning.
Figure 3-1: Format of user priority and VLAN data in an Ethernet frame.
Table 3-2: Fields in the Ethernet frame for QoS and VLAN switching .
Field Length Meaning and use
TPID 2 octets The Tag Protocol Identifier (TPID) is defined by IEEE Standard
802.1q as 0x81-00.
User Priority 3 bits The User Priority field is the priority tag for the frame, which
can be used by the switch to determine the Quality of
Service to apply to the frame. The three bit binary number
represents eight priority levels, 0 to 7.
CFI 1 bit The Canonical Format Indicator (CFI flag) indicates whether
all MAC address information that may be present in the
MAC data carried by the frame is in canonical format.
VID 12 bits The VLAN Identifier (VID) field uniquely identifies the VLAN
to which the frame belongs.
Table 3-3: Reserved VID values .
VID value (hexadecimal) Meaning and use of reserved VID values
0 The null VLAN ID. Indicates that the tag header contains only
user priority information; no VLAN Identifier is present in the
frame. This VID value must not be configured in any Forwarding
Database entry, or used in any management operation. Frames
that contain the null VLAN ID are also known as priority-tagged
frames.
1 The default VID value used for classifying frames on ingress
through an untagged switch port.
FFF Reserved for implementation use. This VID value must not be
configured in any Forwarding Database entry, used in any
management operation, or transmitted in a tag header.
TPID
16 bits
1 bit
3 bits
12 bits
User
Priority
CFI VID
0x81-00
Preamble
Destination
Address
Source
Address
Type/
Length
Frame Data
CRC
64 bits
48 bits 48 bits
16
bits
368-12000
32 bits
SWITCH6
- Switching 1
- Switching 3-3 3
- Introduction 4
- Switch Ports 5
- Port trunking 7
- Packet storm protection 8
- Port mirroring 9
- Port security 10
- VLAN Tagging 11
- Switching 3-13 13
- Training VLAN 15
- Marketing VLAN 15
- Creating VLANs 16
- Summary of VLAN tagging rules 17
- Static and dynamic VLANs 17
- VLAN Relaying 18
- Configuring VLAN relaying 20
- The Layer 2 Switching Process 21
- The Learning Process 22
- The Forwarding Process 23
- Quality of Service 23
- Layer 2 Filtering 24
- Spanning Tree Protocol 25
- Spanning Tree modes 27
- Tree instances 30
- Configuring STP 30
- Switching 3-31 31
- [MAXAGE=6..40] 31
- Hardware Packet Filters 34
- Layer 3 Filter Matches 36
- Layer 3 Filter Entries 37
- Access Control Lists (ACLs) 38
- Triggers 39
- Configuration Examples 40
- Switching 3-41 41
- Command Reference 49
- ACTIVATE SWITCH PORT 49
- ADD STP VLAN 50
- ADD SWITCH FILTER 51
- ACTION=FORWARD PORT=3 52
- ACTION=DISCARD VLAN=4 52
- ADD SWITCH L3FILTER ENTRY 55
- ADD SWITCH L3FILTER MATCH 58
- ADD SWITCH TRUNK 60
- ADD VLAN PORT 61
- ADD VLANRELAY 62
- CREATE STP 63
- CREATE SWITCH TRUNK 63
- CREATE VLAN 65
- CREATE VLANRELAY 66
- DELETE STP VLAN 66
- DELETE SWITCH FILTER 67
- DELETE SWITCH L3FILTER 68
- DELETE SWITCH L3FILTER ENTRY 69
- DELETE SWITCH TRUNK 69
- DELETE VLAN PORT 70
- DELETE VLANRELAY 71
- DESTROY STP 72
- DESTROY SWITCH TRUNK 72
- DESTROY VLANRELAY 74
- DISABLE STP 74
- DISABLE STP DEBUG 75
- DISABLE STP PORT 76
- DISABLE SWITCH AGEINGTIMER 77
- DISABLE SWITCH DEBUG 78
- DISABLE SWITCH HWFILTER 78
- DISABLE SWITCH LEARNING 79
- DISABLE SWITCH L3FILTER 79
- DISABLE SWITCH MIRROR 80
- DISABLE SWITCH PORT 80
- DISABLE VLAN DEBUG 81
- DISABLE VLANRELAY 81
- DISABLE VLANRELAY DEBUG 82
- ENABLE STP 82
- ENABLE STP DEBUG 83
- ENABLE STP PORT 85
- ENABLE SWITCH AGEINGTIMER 86
- ENABLE SWITCH BIST 86
- ENABLE SWITCH DEBUG 87
- ENABLE SWITCH HWFILTER 88
- ENABLE SWITCH L3FILTER 88
- ENABLE SWITCH LEARNING 88
- ENABLE SWITCH MIRROR 89
- ENABLE SWITCH PORT 89
- ENABLE VLAN DEBUG 90
- ENABLE VLANRELAY 91
- ENABLE VLANRELAY DEBUG 91
- PURGE STP 92
- RESET STP 92
- RESET SWITCH 93
- RESET SWITCH PORT 93
- SET STP PORT 96
- SET SWITCH AGEINGTIMER 100
- Software Release 2.6.4 101
- C613-03081-00 REV A 101
- SET SWITCH L3AGEINGTIMER 102
- SET SWITCH L3FILTER ENTRY 103
- SET SWITCH L3FILTER MATCH 106
- SET SWITCH MIRROR 108
- SET SWITCH PORT 109
- SET SWITCH QOS 113
- SET SWITCH TRUNK 115
- SET VLAN PORT 116
- SHOW STP 117
- SHOW STP COUNTER 121
- Related Commands RESET STP 122
- SHOW STP PORT 122
- SHOW STP DEBUG 123
- SHOW SWITCH 127
- SHOW SWITCH COUNTER 128
- SHOW SWITCH DEBUG 130
- SHOW SWITCH FDB 131
- SHOW SWITCH FILTER 133
- SHOW SWITCH HWFILTER 136
- SHOW SWITCH L3FILTER 138
- SHOW SWITCH PORT 140
- SHOW SWITCH PORT COUNTER 143
- SHOW SWITCH PORT INTRUSION 147
- SHOW SWITCH QOS 148
- SHOW SWITCH TRUNK 149
- SHOW VLAN 150
- Related Commands CREATE VLAN 151
- DESTROY VLAN 151
- SHOW VLAN DEBUG 152
- SHOW VLANRELAY 153
- SHOW VLANRELAY=SNARelay 154
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