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Adding an Interface to a QinQ Tunnel
Follow the guidelines in the preceding section to set up a QinQ tunnel on
the switch. Use the VLAN Port Configuration or VLAN Trunk
Configuration screen to set the ingress port on the edge switch to dot1Q
tunnel mode. Also 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.
Command Usage
• Use the System Mode screen to set the switch to QinQ mode before
configuring a tunnel port (see "Configuring the Switch for Normal
Operation or Tunneling Mode" on page 4-4).
• 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, 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.
Command Attributes
• Mode – Set the VLAN membership mode dot1Q-Tunnel.
(Default: Hybrid)
• Dot1q-Tunnel – Configures IEEE 802.1Q tunneling (QinQ) to
segregate and preserve customer VLAN IDs for traffic crossing the
service provider network.
• TPID (0-65535) – Tag Protocol Identifier specifies the ethertype of
incoming packets on a tunnel port.
C
IEEE 802.1Q T
ONFIGURING
UNNELING
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