Vlan Stacking Port Roles - ZyXEL Communications VES1724-56 User Manual

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.
Figure 125 VLAN Stacking Example

23.2 VLAN Stacking Port Roles

Each port can have three VLAN stacking "roles", Normal, Access Port and Tunnel (the latter is for
Gigabit ports only).
Note: Some devices do not support all roles.
• 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.
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Chapter 23 VLAN Stacking
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