Chapter 18
| VLAN Commands
Configuring L2CP Tunneling
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Command Usage
â—† Use this command to configure user-defined PDUs. Then use the switchport
l2protocol-tunnel command to assign these PDUs to an interface.
â—† Refer to the Command Usage section for the l2protocol-tunnel tunnel-dmac
command.
â—† 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 uplink mode using the switchport dot1q-tunnel mode command.
Example
This example sets the protocol ID for a custom PDU to FDDI.
Console(config)#l2protocol-tunnel custom-pdu 1 01-00-0c-cd-cd-d0 bpdu 0010
Console(config-if)#
Related Commands
switchport l2protocol-tunnel (496)
l2protocol-tunnel
tunnel-dmac
This command configures the destination address for Layer 2 Protocol Tunneling
(L2PT). Use the no form to restore the default setting.
Syntax
l2protocol-tunnel tunnel-dmac mac-address
mac-address – The switch rewrites the destination MAC address in all
upstream L2PT protocol packets (e.g., STP BPDUs) to this value, and
forwards them on to uplink ports. The MAC address must be specified in
the format xx-xx-xx-xx-xx-xx or xxxxxxxxxxxx.
Default Setting
01-12-CF-.00-00-02, proprietary tunnel address
Command Mode
Global Configuration
Command Usage
â—† When L2PT is not used, protocol packets (such as STP) are flooded to 802.1Q
access ports on the same edge switch, but filtered from 802.1Q tunnel ports.
This creates disconnected protocol domains in the customer’s network.
â—† L2PT can be used to pass various types of protocol packets belonging to the
same customer transparently across a service provider’s network. In this way,
normally segregated network segments can be configured to function inside a
common protocol domain.
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