H3C Technologies H3C S7500E Series Switches - Manual (Page 65)

4-12
Port type Traffic direction Processing
Downlink packets
Allow only packets with the default
VLAN tag to pass through and
remove the tag of these packets.
Uplink packets
For untagged packets, tag
them with the default VLAN tag
and forward them.
For tagged packets, forward
them directly without any
processing
Trunk
Downlink packets
Allow only tagged packets to pass
through.
For how to configure the link type of an ONU port, refer to Setting the link type of an ONU port to
access and Setting the link type of an ONU port to trunk . Note that:
The access ports described in Table 4-2 do not include ports in the default state, namely, the
access ports in VLAN 1.
The link type of the ONU ports under the same OLT port must be the same (access or trunk).
Thus, when an ONU port under an OLT port is configured as an access port in a VLAN other than
VLAN 1, you can only configure the other ONU ports under the same OLT port as access ports or
leave them in the default state (that is, access ports in VLAN 1); when the ONU port is configured
as a trunk port, you can configure the other ONU ports as trunk ports or leave them in the default
state.
The ONU ports in the default state only allow untagged packets to pass through in the uplink
direction and tag these packets with VLAN 1 tag. In the downlink direction, they only allow the
packets with the VLAN 1 tag to pass through. Such ONU ports remove the VLAN tag of the
downlink packets if the other ONU ports under the same OLT are configured as access ports, and
do not remove the tag of the downlink packets if the other ONU ports under the same OLT port are
configured as trunk ports.
Setting the link type of an ONU port to access
Follow these steps to set the link type of an ONU port to access:
To do… Use the command… Remarks
Enter system view system-view —
Enter ONU port view interface onu interface-number —
Set the link type of the ONU port to
access
port link-type access
Optional
By default, the link type of an ONU
port is access.