Vlan Stacking Port Roles - ZyXEL Communications GS2200-24 User Manual

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 93 VLAN Stacking Example

23.6.2 VLAN Stacking Port Roles

Each port can have three VLAN stacking "roles", Access Port and Tunnel Port
(the latter is for Gigabit ports only).
• 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" and forwarded to the VLAN group that its PVID define.
Note: Static VLAN Tx Tagging MUST be disabled on a port where you choose
Access Port.
• Select Tunnel Port (available for Gigabit ports only) for egress ports at the
edge of the service provider's network. The Switch adds the configured SP TPID
and the corresponding ingress port's SP VID to the outgoing frames before
transmitting them on a Tunnel Port. 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). See
TPID and SP VID.
The Switch checks all incoming frames received on a Tunnel Port. The Switch
drops the frame whose SP VID is not in the SVLAN table and/or SP TPID is
different to the one configured on the Switch.
Note: Static VLAN Tx Tagging MUST be enabled on a port where you choose
Tunnel Port.
GS2200-24 User's Guide
Section 23.6.3 on page 190
Chapter 23 VLAN Stacking
for information about SP
189