C
HAPTER
35
| VLAN Commands
Configuring L2CP Tunneling
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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.
◆ When a Cisco-compatible L2PT packet is received on an access port,
and
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recognized as a CDP/VTP/STP/PVST+ protocol packet, and
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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.
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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.
EXAMPLE
Console(config)#dot1q-tunnel system-tunnel-control
Console(config)#l2protocol-tunnel tunnel-dmac 01-80-C2-00-00-01
Console(config-)#
switchport
l2protocol-tunnel
This command enables Layer 2 Protocol Tunneling (L2PT) for the specified
protocol. Use the no form to disable L2PT for the specified protocol.
SYNTAX
switchport l2protocol-tunnel {cdp | lldp | pvst+ | spanning-tree
| vtp}
cdp - Cisco Discovery Protocol
lldp - Link Layer Discovery Protocol
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