Zyxel OLT2412 [160/326] Vlan stacking port roles

Chapter 23 VLAN Stacking and Translation

OLT2412 User’s Guide

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Figure 42 VLAN Stacking Example

23.1.2 VLAN Stacking Port Roles

Each port can have three VLAN stacking “roles”, normal, access port and tunnel port (the latter is

for Gigabit ports only).

• Use normal for “regular” (non-VLAN stacking) IEEE 802.1Q frame switching.

• Use access port for ingress ports on the service provider's edge devices (1 and 2 in the VLAN

stacking example figure). The incoming frame is treated as inner tagged or untagged, so a

second VLAN tag (outer VLAN tag) can be added.

Note: If you use Q in Q, static VLAN Tx tagging must be enabled on a port set to the

normal or access port role.

Otherwise static VLAN Tx Tagging must be disabled on a port set to the normal or

access port role.

• Use Tunnel Port (available for Gigabit ports only) for egress ports at the edge of the service

provider's network. All VLANs belonging to a customer can be aggregated into a single service

provider's VLAN (using the outer VLAN tag defined by the Service Provider’s (SP) VLAN ID

(VID)).

Note: Static VLAN Tx tagging MUST be enabled on a port where you choose tunnel port.

23.2 VLAN Translation Overview

With VLAN translation enabled, the OLT can map the VLAN ID and priority level of packets received

from a private network to those used in the service provider’s network.

The OLT checks incoming traffic from the switch ports (non-management ports) against the VLAN

translation table first, the MAC learning table and then the VLAN table before forwarding them

through an uplink port. When VLAN translation miss drop is enabled, the OLT discards the tagged

packets that do not match an entry in the VLAN translation table.