– Access link: connects a PC to a switch. Generally, a PC does not know which VLAN
it belongs to, and PC hardware cannot distinguish frames with VLAN tags. Therefore,
PCs send and receive only untagged frames.
– Trunk link: connects a switch to another switch or to a router. Data of different VLANs
are transmitted along a trunk link. The two ends of a trunk link must be able to distinguish
frames with VLAN tags. Therefore, only tagged frames are transmitted along trunk
links.
l Port types
Table 3-2 lists VLAN port types.
Table 3-2 Port types
Port
Type
Method of
Processing
Received
Untagged Frames
Method of
Processing
Received
Tagged
Frames
Method of
Sending
Frames
Application
Access
port
Accepts an untagged
frame and adds a tag
with the default
VLAN ID to the
frame.
l Accepts a
tagged
frame if the
VLAN ID
carried in
the frame is
the same as
the default
VLAN ID.
l Discards a
tagged
frame if the
VLAN ID
carried in
the frame is
different
from the
default
VLAN ID.
Removes the tag
from a frame and
sends the frame.
An access port
connects a
switch to a PC
and can be
added to only
one VLAN.
Quidway S7700 Smart Routing Switch
Configuration Guide - Ethernet 3 VLAN Configuration
Issue 01 (2011-07-15) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
68
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