Vlan Classification; Configuring Basic Vlan Attributes - H3C S7500E Series Operation Manual

Operation Manual – VLAN
H3C S7500E Series Ethernet Switches
The TPID field, 16 bits in length and with a value of 0x8100, indicates that a packet
carries a VLAN tag with it.
The Priority field, three bits in length, indicates the 802.1p priority of a packet. For
information about packet priority, refer to QoS Configuration.
The CFI field, one bit in length, specifies whether or not the MAC addresses are
encapsulated in standard format when packets are transmitted across different
medium. With the field set to 0, MAC addresses are encapsulated in standard
format; with the field set to 1, MAC addresses are encapsulated in non-standard
format. The filed is 0 by default.
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
Note:
The frame format mentioned here is that of Ethernet II. Besides Ethernet II
encapsulation, other types of encapsulation, including 802.2 LLC, 802.2 SNAP, and
802.3 raw are also supported. The VLAN tag fields are also added to packets adopting
these encapsulation formats for VLAN identification.

1.1.3 VLAN Classification

Based on different criteria, VLANs can be classified into different categories. The
following types are the most commonly used:
Port-based
MAC address-based
Protocol-based
IP-subnet-based
Policy-based
Other types
S7500E series Ethernet switches support port-based VLAN, protocol-based VLAN,
and IP-subnet-based VLAN.

1.2 Configuring Basic VLAN Attributes

Follow these steps to configure basic VLAN attributes:
Introduction to Port-Based
1-3
Chapter 1 VLAN Configuration
VLAN.