Chapter 21 VLAN Stacking
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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 75 VLAN Stacking Example
21.2 VLAN Stacking Port Roles
Each port can have one of the following VLAN stacking “roles”: Access Port or
Tunnel .
• 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
Access Port.
• Select Tunnel Port 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.
