C
HAPTER
36
| VLAN Commands
Configuring L2CP Tunneling
– 1149 –
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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.
◆ 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).
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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
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L2PT is enabled on this port, it is forwarded to other access
ports in the same S-VLAN for which L2PT is enabled
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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.
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