H3c-technologies H3C WX6000 Series Access Controllers Manual do Utilizador descarregar pdf (Página 108)

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13 BPDU Tunneling Configuration

When configuring BPDU tunneling, go to these sections for information you are interested in:

z Introduction to BPDU Tunneling

z Configuring BPDU Isolation

z Configuring BPDU Transparent Transmission

z Configuring Destination Multicast MAC Address for BPDU Tunnel Frames

z BPDU Tunneling Configuration Example

Introduction to BPDU Tunneling

Why BPDU Tunneling

To avoid loops in your network, you can enable the spanning tree protocol (STP) on your device.

However, STP gets aware of the topological structure of a network by means of bridge protocol data

units (BPDUs) exchanged between different devices and the BPDUs are Layer 2 multicast packets,

which can be received and processed by all STP-enabled devices on the network. This prevents each

network from correctly calculating its spanning tree. As a result, when redundant links exist in a network,

data loops will unavoidably occur.

By allowing each network to have its own spanning tree while running STP, BPDU tunneling can resolve

this problem.

z BPDU tunneling can isolate BPDUs of different customer networks, so that one network is not

affected by others while calculating the topological structure.

z BPDU tunneling enables BPDUs of the same customer network to be broadcast in a specific VLAN

in the provider network, so that the geographically dispersed customer networks of the same

customer can implement consistent spanning tree calculation across the provider network.

How BPDU Tunneling Works

The BPDU tunneling implements the following two functions:

z BPDU isolation

z BPDU transparent transmission

The work process of IGMP is as follows:

BPDU isolation

When a port receives BPDUs of other networks, the port will discard the BPDUs, so that they will not

take part in spanning tree calculation. Refer to

Configuring BPDU Isolation.

BPDU transparent transmission

As shown in Figure 13-1, the upper part is the service provider network, and the lower part represents

the customer networks. The customer networks include network A and network B. Enabling the BPDU

tunneling function on the BPDU input/output devices across the service provider network allows BPDUs

of the customer networks to be transparently transmitted in the service provider network, and allows

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