Types Of Vlan - HP 5820X series Configuration Manual

IEEE 802.1Q inserts a four-byte VLAN tag after the DA&SA field, as shown in
Figure 36 The position and format of VLAN tag
A VLAN tag comprises the following fields: TPID, priority, CFI, and VLAN ID.
The 16-bit TPID field with a value of 0x8100 indicates that the frame is VLAN-tagged.
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The 3-bit priority field indicates the 802.1p priority of the frame. For more information about frame
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priorities, see the ACL and QoS Configuration Guide.
The 1-bit CFI field specifies whether the MAC addresses are encapsulated in the standard format
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when packets are transmitted across different media. A value of 0 indicates that MAC addresses are
encapsulated in the standard format; a value of 1 indicates that MAC addresses are encapsulated
in a non-standard format. The value of the field is 0 by default.
The 12-bit VLAN ID field identifies the VLAN the frame belongs to. The VLAN ID range is 0 to 4095.
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As 0 and 4095 are reserved, a VLAN ID actually ranges from 1 to 4094.
A network device handles an incoming frame depending on whether the frame is VLAN tagged and the
value of the VLAN tag, if any. For more information, see
The Ethernet II encapsulation format is used here. Besides the Ethernet II encapsulation format, other
encapsulation formats, including 802.2 LLC, 802.2 SNAP, and 802.3 raw, are also supported by
Ethernet. The VLAN tag fields are also added to frames encapsulated in these formats for VLAN
identification.
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 payload.

Types of VLAN

Implement VLAN based on the following criteria:
Port
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MAC address
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Protocol
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IP subnet
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Policy
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Other criteria
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This series Ethernet switches support port-based VLAN, MAC-based VLAN, protocol-based VLAN, and IP-
based VLAN. The port-based VLAN implementation is the basis of all other VLAN implementations. To
use any other VLAN implementations, you must configure port-based VLAN settings.
Configure all four types of VLANs on a port at the same time. When determining to which VLAN a
packet passing through the port should be assigned, the device looks up the VLANs in the default order
of MAC-based VLAN, IP-based VLAN, protocol-based VLAN, and port-based VLAN.
"Introduction to port-based
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Figure 36.
VLAN."