H3C S7500 Series Operation Manual page 100

Operation Manual – VLAN
H3C S7500 Series Ethernet Switches
Caution:
You are recommended to set the default VLAN ID of the local Hybrid or Trunk ports to
the same value as that of the Hybrid or Trunk ports on the peer switch. Otherwise,
packet forwarding may fail on the ports.
After a port is added to a VLAN and configured with a default VLAN, the port receives
and sends packets in a way related to its link type. For detailed description, refer to the
following tables:
Table 1-1 Packet processing of an Access port
If the packet does not
carry a VLAN tag
Receive the packet and
add the default VLAN
tag to the packet.
Table 1-2 Packet processing of a Trunk port
If the packet does not
carry a VLAN tag
If the port is already
added to its default
VLAN,
default VLAN tag to
the packet and then
forward the packet.
If the port is not
added to its default
VLAN, discard the
packet.
Processing of an incoming packet
If the packet carries a
Processing of an incoming packet
If the packet carries a
add the
VLAN tag
If the VLAN ID is just
the default VLAN ID,
receive the packet.
If the VLAN ID is not the
default VLAN ID,
discard the packet.
VLAN tag
If the VLAN ID is one of
the VLAN IDs allowed
to pass through the
port, receive the
packet.
If the VLAN ID is not
one of the VLAN IDs
allowed to pass through
the port, discard the
packet.
1-5
Chapter 1 VLAN Overview
Processing of an
outgoing packet
Deprive the tag from the
packet and send the
packet.
Processing of an
outgoing packet
If the VLAN ID is just
the default VLAN ID,
deprive the tag and
send the packet.
If the VLAN ID is not the
default VLAN ID, keep
the original
unchanged and send
the packet.
tag