Operation Manual – VLAN
H3C S3600 Series Ethernet Switches-Release 1510 Chapter 1
VLAN Overview
1-3
z Priority is a 3-bit field, referring to 802.1p priority. Refer to section “QoS & QoS
profile” for details.
z CFI is a 1-bit field, indicating whether the MAC address is encapsulated in the
standard format in different transmission media. This field is not described in detail
in this chapter.
z VLAN ID is a 12-bit field, indicating the ID of the VLAN to which this packet
belongs. It is in the range of 0 to 4,095. Generally, 0 and 4,095 is not used, so the
field is in the range of 1 to 4,094.
VLAN ID identifies the VLAN to which a packet belongs. When the switch receives a
packet carrying no VLAN tag, it will encapsulate a VLAN tag with the default VLAN ID of
the inbound port for the packet, and the packet will be assigned to the default VLAN of
the inbound port for transmission. For the details about setting the default VLAN of a
port, refer to section “Port Basic Configuration” in
H3C S3600 Series Ethernet Switches
Operation Manual
.
1.2 Port-Based VLAN
Port-based VLAN technology introduces the simplest way to classify VLANs. You can
isolate the hosts and divide them into different virtual workgroups through assigning the
ports on the device connecting to hosts to different VLANs.
This way is easy to implement and manage and it is applicable to hosts with relatively
fixed positions.
1.3 Protocol-Based VLAN
1.3.1 Introduction to Protocol-Based VLAN
Protocol-based VLAN is also known as protocol VLAN, which is another way to classify
VLANs besides port-based VLAN. Through the protocol-based VLANs, the switch can
analyze the received packets carrying no VLAN tag on the port and match the packets
with the user-defined protocol template automatically according to different
encapsulation formats and the values of the special fields. If a packet is matched, the
switch will add a corresponding VLAN tag to it automatically. Thus, the data of the
specific protocol is assigned automatically to the corresponding VLAN for transmission.
This feature is used for binding the ToS provided in the network to VLAN to facilitate
management and maintenance.
1.3.2 Encapsulation Format of Ethernet Data
This section introduces the common encapsulation formats of Ethernet data for you to
understand well the procedure for the switch to identify the packet protocols.
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