H3C S5500-SI Series Operation Manual page 6

Operation Manual – VLAN
H3C S5500-SI Series Ethernet Switches
I. Link Type of an Ethernet Port
Depending on how a port processes VLAN tags when it forwards packets, the link type
of the port can be one of the following three types:
Access. An access port belongs to only one VLAN; it strips VLAN tags when
sending the packets of the VLAN. An access port is generally used to connect a
user device.
Trunk. A trunk port can belong to more than one VLAN and receives/sends the
packets of multiple VLANs; it is generally used to connect a switch.
Hybrid. A hybrid port can also belong to more than one VLAN and receives/sends
the packets of multiple VLANs; it is used to connect a switch or a user device.
The difference between the hybrid port and the trunk port is that:
A hybrid port allows the packets from multiple VLANs to be sent without tags.
A trunk port only allows the packets from the default VLAN to be sent without tags.
II. Default VLAN
You can configure a VLAN for a port. In additional, you can also configure a default
VLAN for the port. By default, the default VLAN of all the ports is VLAN 1. But you can
configure it as needed.
The default VLAN of an access port is the VLAN the access port belongs to and
cannot be configured.
Both of the trunk port and hybrid port allow multiple VLANs to pass through. You
can configure the default VLAN for them.
After you delete the default VLAN of a port through the undo vlan command, for
an access port, its default VLAN restore to VLAN 1; for a trunk or a hybrid port, its
default VLAN configuration remain unchanged, that is, a trunk port or hybrid port
can use the presently nonexistent VLAN as the default VLAN.
Note:
For ports of a voice VLAN in automatic mode, you cannot configure the voice VLAN as
the default VLAN of the ports. If you do so, the system will prompt that you cannot
perform the configuration. For information about the voice VLAN, refer to Chapter 2
Voice VLAN Configuration.
The way by which a port processes incoming and outgoing packets depends on the link
type and default VLAN configured on it. Refer to the following table for details:
1-4
Chapter 1 VLAN Configuration