ZyXEL Communications MES3500-24 用户手册

Chapter 23 VLAN Stacking

MES3500-24/24F User’s Guide

adding tag 37 to distinguish customer A and tag 48 to distinguish customer B at edge device 1 and 
then stripping those tags at edge device 2 as the data frames leave the network. 

VLAN Stacking Example 

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.