CLI Reference Guide-R05

Table Of Contents
Chapter 19
| VLAN Commands
Configuring L2PT Tunneling
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with destination address 01-80-C2-00-00-01~0A (S-VLAN), the frame is
filtered, decapsulated, and processed locally by the switch if the protocol is
supported.
Processing Cisco-compatible protocol packets
When a Cisco-compatible L2PT packet is received on an uplink port, and
recognized as a CDP/VTP/STP/PVST+ protocol packet (where STP means
STP/RSTP/MSTP), it is forwarded to the following ports in the same S-VLAN:
(a) all access ports for which L2PT has been disabled, and (b) all uplink
ports.
recognized as a Generic Bridge PDU Tunneling (GBPT) protocol packet (i.e.,
having the destination address 01-00-0C-CD-CD-D0), it is forwarded to the
following ports in the same S-VLAN:
other access ports for which L2PT is enabled after decapsulating
the packet and restoring the proper protocol and MAC address
information.
all uplink ports.
When a Cisco-compatible L2PT packet is received on an access port, and
recognized as a CDP/VTP/STP/PVST+ protocol packet, and
L2PT is enabled on this port, it is forwarded to the following
ports in the same S-VLAN: (a) other access ports for which L2PT
is enabled, and (b) uplink ports after rewriting the destination
address to make it a GBPT protocol packet (i.e., setting the
destination address to 01-00-0C-CD-CD-D0).
L2PT is disabled on this port, it is forwarded to the following
ports in the same S-VLAN: (a) other access ports for which L2PT
is disabled, and (b) all uplink ports.
recognized as a GBPT protocol packet (i.e., having the destination address
01-00-0C-CD-CD-D0), and
L2PT is enabled on this port, it is forwarded to other access
ports in the same S-VLAN for which L2PT is enabled
L2PT is disabled on this port, it is forwarded to the following
ports in the same S-VLAN: (a) other access ports for which L2PT
is disabled, and (b) all uplink ports.
For L2PT to function properly, QinQ must be enabled on the switch using the
dot1q-tunnel system-tunnel-control command, and the interface configured to
802.1Q tunnel mode using the switchport dot1q-tunnel mode command.