Installation and Getting Started Guide
7 - 6
Figure 7.4 Packet containing HP’s 802.1QVLAN tag
NOTE: You cannot configure a port to be a member of the default port-based VLAN and another port-based
VLAN at the same time. Once you add a port to a port-based VLAN, the port is no longer a member of the default
VLAN. The port returns to the default VLAN only if you delete the other VLAN(s) that contains the port.
If you configure a VLAN that spans multiple devices, you need to use tagging only if a port connecting one of the
devices to the other is a member of more than one port-based VLAN. If a port connecting one device to the other
is a member of only a single port-based VLAN, tagging is not required.
If you use tagging on multiple devices, each device must be configured for tagging and must use the same tag
value. In addition, the implementation of tagging must be compatible on the devices. The tagging on all HP
devices is compatible with other HP devices.
6 bytes
Destination
Address
2 bytes
Length
Field
Up to 1496 bytes
Data
Field
4 bytes
CRC
IEEE 802.3
6 bytes
Source
Address
6 bytes
Destination
Address
2 bytes
Type
Field
Up to 1500 bytes
Data
Field
4 bytes
CRC
Ethernet II
6 bytes
Source
Address
2 bytes
Length
Field
Up to 1496 bytes
Data
Field
4 bytes
CRC
IEEE 802.3 with 802.1q tag
2 bytes
Type
Field
Up to 1500 bytes
Data
Field
4 bytes
CRC
Ethernet II with 802.1q tag
4 bytes
802.1q
Tag
4 bytes
802.1q
Tag
802.1q Tagged Packet Format
Octet 1 Octet 2
Tag Protocol Id (TPID)
5 6 7 8 Octet 4
VLAN ID (12 bits)
1 2 3 4
802.1p
(3 bits)
6 bytes
Destination
Address
2 bytes
Length
Field
Up to 1496 bytes
Data
Field
4 bytes
CRC
IEEE 802.3
6 bytes
Source
Address
6 bytes
Destination
Address
2 bytes
Type
Field
Up to 1500 bytes
Data
Field
4 bytes
CRC
Ethernet II
6 bytes
Source
Address
Untagged Packet Format
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