SMC Networks SMC7816M, SMC7816VSW 13-30, Adding an Interface to a QinQ Tunnel

VLAN C ONFIGURATION
13-30
Adding an Interface to a QinQ Tunnel
Follow the guidelines in the preceding section to set up a QinQ tunnel on
the switch. Set the ingress port on the servic e provider’s network to dot1Q
tunnel mode. Set the Tag Protocol Identifier (TPID) value of the tunnel
port if the attached client is using a nonstandard 2-byte ethertype to
identify 802.1Q tagged frames. And specify whether or not to copy the
priority bits from the inner VLAN tag to the outer VLAN tag.
Command Attributes
•Switchport Mode – Set the VLAN membership mode dot1Q-Tunnel.
•Dot1q-Ethertype TPID – The Tag Protocol Identifier specifies the
ethertype of incoming packets on a tunnel port. (Range: 0-65535;
Default: not set)
Use the TPID field to set a custom 802.1Q ethertype value on the
selected interface. This feature allows the switch to interoperate with
third-party switches that do not use the standard 0x8100 ethertype to
identify 802.1Q-tagged frames. For example, if 0x1234 is set as the
custom 802.1Q ethertype on a trunk port, incoming frames containing
that ethertype are assigned to the VLAN contained in the tag following
the ethertype field, as they would be with a standard 802.1Q trunk.
Frames arriving on the port containing any other ethertype are looked
upon as untagged frames, and assigned to the native VLAN of that port.
All members of a VLAN should be set to the same ethertype.
•QinQ Priority Map – Copies the priority bits from the inner VLAN tag
used by customer to the outer VLAN tag used by service provider.
(Default: Disabled)
The packet must have a standard ethertype value of 0x8100 for this
command to take effect. Otherwise, the priority bits in the outer tag are
set to zero.
Using a fixed priority level for all customer traffic allows the service
provider to more easily calculate the resources required to maintain
adequate bandwidth for a large number of customers. However, if it is