Administrator Guide
Figure 131. VLAN Stacking without L2PT
You might need to transport control trac transparently through the intermediate network to the other region. Layer 2 protocol tunneling
enables BPDUs to traverse the intermediate network by identifying frames with the Bridge Group Address, rewriting the destination MAC
to a user-congured non-reserved address, and forwarding the frames. Because the frames now use a unique MAC address, BPDUs are
treated as normal data frames by the switches in the intermediate network core. On egress edge of the intermediate network, the MAC
address rewritten to the original MAC address and forwarded to the opposing network region (shown in the following illustration).
Dell Networking OS Behavior: The L2PT MAC address is user-congurable, so you can specify an address that non-Dell Networking
systems can recognize and rewrite the address at egress edge.
Service Provider Bridging
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