Vlan Stacking Port Roles; Vlan Tag Format - ZyXEL Communications XGS4600 Series User Manual

Figure 192 VLAN Stacking Example

24.2 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).
• 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 the Service Provider's (SP) VLAN ID (VID)).
Note: Static VLAN Tx Tagging MUST be enabled on a port where you choose Tunnel Port.

24.3 VLAN Tag Format

A VLAN tag (service provider VLAN stacking or customer IEEE 802.1Q) consists of the following three
fields.
Table 94 VLAN Tag Format
Type
Chapter 24 VLAN Stacking
Priority VID
XGS4600 Series User's Guide
250