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18.1.2 Background of bpdu-tunnel
Special lines are used in a service provider network to build user-specific Layer 2 networks. As
a result, a user network is broken down into parts located at different sides of the service
provider network. As shown in Figure, User A has two devices (CE 1 and CE 2) and both
devices belong to the same VLAN. User's network is divided into network 1 and network 2,
which are connected by the service provider network. When Layer 2 protocol packets cannot
implement the passthrough across the service provider network, the user's network cannot
process independent Layer 2 protocol calculation (for example, spanning tree calculation), so
they affect each other.
18.2 bpdu-tunnel Configuration Task List
bpdu-tunnel configuration task list:
1. Configure tunnel MAC address globally
2. Configure the port to support the tunnel
1. Configure tunnel MAC address globally
Command
Global mode
bpdu-tunnel dmac <mac>
no bpdu-tunnel dmac
Figure 18-1: BPDU Tunnel application
18-68
Explanation
Configure or cancel the tunnel MAC
address globally.
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Troubleshooting
