6
<RouterA> display ip interface brief
*down: administratively down
(s): spoofing
Interface Physical Protocol IP Address Description
Vlan5 up up 192.168.0.10 Vlan-inte...
Vlan10 up up 192.168.1.20 Vlan-inte...
Configuring port-based VLANs
Introduction to port-based VLAN
Port-based VLANs group VLAN members by port. A port forwards traffic for a VLAN only after it is
assigned to the VLAN.
Port link type
You can configure the link type of a port as access, trunk, or hybrid. The three link types use different
VLAN tag handling methods.
•
An access port belongs to only one VLAN and sends traffic untagged. It is typically used to connect
a terminal device unable to recognize VLAN tagged-packets or when there is no need to
differentiate VLAN members. As shown in
, because Device A is connected with common
PCs that cannot recognize VLAN tagged-packets, you need to configure Device A’s ports that
connect the PCs as access ports.
•
A trunk port can carry multiple VLANs to receive and send traffic for them. Except traffic of the port
VLAN (PVID), traffic sent through a trunk port will be VLAN tagged. Usually, ports connecting
network devices are configured as trunk ports. As shown in
, because Device A and Device
B need to transmit packets of VLAN 2 and VLAN 3, you need to configure the ports connecting
Device A and Device B as trunk ports, and assign them to VLAN 2 and VLAN 3.
•
Like a trunk port, a hybrid port can carry multiple VLANs to receive and send traffic for them. Unlike
a trunk port, a hybrid port allows traffic of all VLANs to pass through untagged. Usually, hybrid
ports are configured to connect network devices whose support for VLAN tagged-packets you are
uncertain about. As shown in
, Device B connects a small-sized LAN in which some PCs
belong to VLAN 2 while some other PCs belong to VLAN 3. In this case, you need to configure
Device B’s port connecting the LAN as a hybrid port that allows packets of VLAN 2 and VLAN 3
to pass through untagged.
