C
HAPTER
35
| VLAN Commands
Configuring L2CP Tunneling
– 1139 –
CONFIGURING L2CP TUNNELING
This section describes the commands used to configure Layer 2 Protocol
Tunneling (L 2PT).
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 (i.e, 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.
â—† L2PT encapsulates protocol packets entering ingress ports on the
service provider’s edge switch, replacing the destination MAC address
with a proprietary MAC address (for example, the spanning tree
protocol uses 10-12-CF-00-00-02), a reserved address for other
specified protocol types (as defined in IEEE 802.1ad – Provider
Bridges), or a user-defined address. All intermediate switches carrying
this traffic across the service provider’s network treat these
encapsulated packets in the same way as normal data, forwarding
Table 138: L2 Protocol Tunnel Commands
Command Function Mode
l2protocol-tunnel
tunnel-dmac
Configures the destination address for Layer 2 Protocol
Tunneling
GC
switchport
l2protocol-tunnel
Enables Layer 2 Protocol Tunneling for the specified
protocol
IC
show l2protocol-tunnel Shows settings for Layer 2 Protocol Tunneling PE
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