TRENDnet TI-PG1284i User Manual page 73

TRENDnet User's Guide
Data: Frame data
FCS: Frame Check Sequence
VLAN Stacking Port Roles
Each port can have three VLAN stacking "roles", Normal, Access Port and Tunnel Port.

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. The
incoming frame is treated as "untagged", so a second VLAN tag (outer VLAN tag)
can be added.

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 SP VID).
NOTE: In order to have the double tagged frames switching correctly, user has to
configure a service provider's VLAN (SPVLAN) on the Q-in-Q switch. Then, the double
tagged frames can be switched according to the SP VID. The SPVLAN should include all
the related Tunnel and Access ports. Also, user has to configure the Tunnel posts as
tagged ports and the Access ports as untagged ports.
Port-based Q-in-Q
Q-in-Q encapsulation is to convert a single tagged 802.1Q packet into a double tagged Q-
in-Q packet. The Q-in-Q encapsulation can be based on port or traffic. Port-based Q-in-Q
is to encapsulate all the packets incoming to a port with the same SPVID outer tag. The
mode is more inflexible.
In the following example figure, both X and Y are Service Provider's Network (SPN)
customers with VPN tunnels between their head offices and branch offices respectively.
Both have an identical VLAN tag for their VLAN group. The service provider can separate
these two VLANs within its network by adding tag 100 to distinguish customer X and tag
200 to distinguish customer Y at edge device A and then stripping those tags at edge
device B as the data frames leave the network.
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This example shows how to configure switch A with ports 1 on the Switch to tag incoming
frames with the service provider's VID of 200 (ports are connected to customer X
network) and configure port 7 to service provider's VID of 100 (ports are connected to
customer Y network). This example also shows how to set the priority for port 1 to 3 and
port 7 to 4.
TI-PG1284I(config)# vlan-stacking port-based
TI-PG1284I(config)# vlan-stacking tpid-table index 2 value 88a8
TI-PG1284I(config)# vlan 10
TI-PG1284I(config-vlan)# fixed 7,8
TI-PG1284I(config-vlan)# tagged 7
TI-PG1284I(config-vlan)# exit
TI-PG1284I(config)# vlan 100
TI-PG1284I(config-vlan)# fixed 7,8
TI-PG1284i
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