Chapter 19
| VLAN Commands
Configuring L2CP Tunneling
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Processing protocol packets defined in IEEE 802.1ad – Provider Bridges
◆ When an IEEE 802.1ad protocol packet is received on an uplink port (i.e., an
802.1Q tunnel ingress port connecting the edge switch to the service provider
network)
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with the destination address 01-80-C2-00-00-00,0B~0F (C-VLAN tag), it is
forwarded to all QinQ uplink ports and QinQ access ports in the same S-
VLAN for which L2PT is enabled for that protocol.
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with the destination address 01-80-C2-00-00-01~0A (S-VLAN tag), it is
filtered, decapsulated, and processed locally by the switch if the protocol is
supported.
◆ When a protocol packet is received on an access port (i.e., an 802.1Q trunk port
connecting the edge switch to the local customer network)
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with the destination address 01-80-C2-00-00-00,0B~0F (C-VLAN), and
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L2PT is enabled on the port, the frame is forwarded to all QinQ uplink
ports and QinQ access ports on which L2PT is enabled for that protocol
in the same S-VLAN.
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L2PT is disabled on the port, the frame is decapsulated and processed
locally by the switch if the protocol is supported.
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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
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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.
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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:
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other access ports for which L2PT is enabled after decapsulating the
packet and restoring the proper protocol and MAC address
information.
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all uplink ports.
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