Vlan Stacking Port Roles; Vlan Tag Format; Figure 68 Vlan Stacking Example; Table 49 Vlan Tag Format - ZyXEL Communications ZyXEL Dimension ES-3148 User Manual

ES-3148 User's Guide

Figure 68 VLAN Stacking Example

21.2 VLAN Stacking Port Roles

Each port can have three VLAN stacking "roles", Normal, Access Port and Tunnel (the latter
is for Gigabit ports only).
• Select Normal for "regular" (non-VLAN stacking) IEEE 802.1Q frame switching.
• Select 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 "untagged", so a
second VLAN tag (outer VLAN tag) can be added.
Note: Static VLAN Tx Tagging MUST be disabled on a port where you choose
Normal or Access Port.
• Select 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 SP VID).
Note: Static VLAN Tx Tagging MUST be enabled on a port where you choose
Tunnel Port.

21.3 VLAN Tag Format

A VLAN tag (service provider VLAN stacking or customer IEEE 802.1Q) consists of the
following three fields.

Table 49 VLAN Tag Format

Type
160
Priority VID
Chapter 21 VLAN Stacking