METRODATA LTD
WCM5100
Quick Start Guide
76-02-087 Rev A
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A port is configured as an Access Port if it is assigned to a VLAN, ie given a VLAN ID
between 1 and 4095 and all frames ingressing this port will have a VLAN Tag added, and
on egress will have the tag removed. This configuration item defines the VLAN ID which
will be added and may be in the range (1 to 4095 ). One or more ports may be assigned to
the same VLAN and packets will then only switch between those ports and trunk ports.
A port is configured as TRUNK, if the VLAN ID 0 or none is selected. In this case frames
ingress and egress with tags unchanged. A trunk is assumed to be a member of all
VLANs
4.2.2.20 QinQ S-TAG ID
If the Traffic Isolation mode is set to QinQ then the LAN port may be assigned provider
mode Service Tag, S-TAG. and all frames ingressing this port will have the S-Tag added.
This configuration item defines the S-TAG ID which will be added and may be in the range
(1 to 4095 ). One or more ports may be assigned the same S-TAG and packets will then
only switch between those ports and the WAN interface.
In QinQ mode, ingress packets may be tagged or untagged and all will have a single S-
TAG stripped before egress.
4.2.2.21 default Priority
When the traffic isolation mode is VLAN, this is the priority value that is added with the
VLAN ID during ingress. In QinQ mode, untagged packets are given this default priority,
whilst tagged packets promote the C-TAG priority to the S-TAG priority.
