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Dimension ES-3124 Ethernet Switch
21-2 VLAN Stacking
Figure 21-1 VLAN Stacking Example
21.2 VLAN Stacking 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.
Static VLAN Tx Tagging MUST be disabled on a port where you choose Normal or Access Port.
Select Tunnel (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).
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.
Type Priority VID