Brocade Communications Systems Brocate Ethernet Access Switch 6910 - Manual (Page 445)

Brocade 6910 Ethernet Access Switch Configuration Guide 395
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Configuring L2CP Tunneling
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• 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 them across to the tunnel’s
egress port. The egress port decapsulates these packets, restores the proper protocol and
MAC address information, and then floods them onto the same VLANs at the customer’s
remote site (via all of the appropriate tunnel ports and access ports
10 connected to the same
metro VLAN).
• The way in which L2PT processes packets is based on the following criteria – (1) packet is
received on a QinQ uplink port, (2) packet is received on a QinQ access port, or (3) received
packet is Cisco-compatible L2PT (i.e., as indicated by a proprietary MAC address).
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)
• 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.
• 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)
• with the destination address 01-80-C2-00-00-00,0B~0F (C-VLAN), and
• 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.
• L2PT is disabled on the port, the frame is decapsulated and processed locally by the
switch if the protocol is supported.
• 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
• 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.
• 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:
• other access ports for which L2PT is enabled after decapsulating the packet and
restoring the proper protocol and MAC address information.
• all uplink ports.
• When a Cisco-compatible L2PT packet is received on an access port, and
• recognized as a CDP/VTP/STP/PVST+ protocol packet, and
10. Access ports in this context are 802.1Q trunk ports.