H3C Technologies H3C S3100 Series Switches - Manual (Page 124)

Operation Manual – Port Basic Configuration
H3C S3100-52P Ethernet Switch Chapter 1 Port Basic Configuration
1-2
1.1.3 Configuring the Default VLAN ID for an Ethernet Port
An access port can belong to only one VLAN. Therefore, the VLAN an access port
belongs to is also the default VLAN of the access port. A hybrid/trunk port can belong to
several VLANs, and so a default VLAN ID for the port is required.
After you configure default VLAN IDs for Ethernet ports, the packets passing through
the ports are processed in different ways depending on different situations. See Table
1-2 for details.
Table 1-2
Processing of incoming/outgoing packets
Processing of an incoming packet
Port
type
If the
packet
does not
carry a
VLAN tag
If the packet carries a
VLAN tag
Processing of an outgoing
packet
Access
z
If the VLAN ID is just
the default VLAN ID,
receive the packet.
z
If the VLAN ID is not
the default VLAN ID,
discard the packet.
Deprive the tag from the packet
and send the packet.
Trunk
z
If the VLAN ID is just the
default VLAN ID, deprive
the tag and send the packet.
z
If the VLAN ID is not the
default VLAN ID, keep the
original tag unchanged and
send the packet.
Hybrid
Receive
the packet
and add
the default
tag to the
packet.
z
If the VLAN ID is just
the default VLAN ID,
receive the packet.
z
If the VLAN ID is not
the default VLAN ID
but is one of the
VLAN IDs allowed to
pass through the
port, receive the
packet.
z
If the VLAN ID is
neither the default
VLAN ID, nor one of
the VLAN IDs
allowed to pass
through the port,
discard the packet.
z
If the VLAN ID is just the
default VLAN ID, deprive
the tag and send the packet.
z
If the VLAN ID is not the
default VLAN ID, deprive
the tag or keep the tag
unchanged (whichever is
done is determined by the
port hybrid vlan
vlan-id-list
{ tagged | untagged }
command) and send the
packet.