Operation Manual – VLAN
H3C S9500 Series Routing Switches
Chapter 1 VLAN Configuration
1-3
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The Priority field, three bits in length, indicates the 802.1p priority of a packet. For
information about packet priority, refer to
QoS Configuration
in the
QoS ACL
Volume
.
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The canonical format indicator (CFI) field, one bit in length, specifies whether or
not the MAC addresses are encapsulated in the standard format when packets are
transmitted across different medium. The value 0 indicates MAC addresses are
encapsulated in the standard format, and the value 1 indicates MAC addresses
are encapsulated in a non-standard format.
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The VLAN ID field, 12 bits in length and with its value ranging from 0 to 4095,
identifies the ID of the VLAN a packet belongs to. As VLAN IDs of 0 and 4095 are
reserved by the protocol, the actual value of this field ranges from 1 to 4094.
A network device determines the VLAN to which a packet belongs to by the VLAN ID
field the packet carries. The VLAN Tag determines the way a packet is processed. For
more information, refer to section
Introduction to the Port-Based VLAN
.
Note:
The Ethernet II encapsulation format is taken for example here. Ethernet also supports
802.2 LLC, 802.2 SNAP and 802.3 raw encapsulation formats. For packets
encapsulated in these formats, a VLAN tag is used to differentiate packets of different
VLANs.
1.1.3 VLAN Classification
VLANs can be classified into different categories. The following four types are the most
commonly used:
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Port-based
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MAC address-based
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IP-subnet-based
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Protocol-based
Note:
At present, S9500 series switches support port-based VLANs and protocol-based
VLANs.
The following contents introduce the configuration of port-based VLANs and
protocol-based VLANs respectively.