3com 5500-ei pwr Instruccion De Instalación

 

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

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BPDU Tunnel Overview 

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Normally, Layer 2 protocols are needed in a LAN for network topology maintenance and management. 

For example, spanning tree protocol (STP) is used for maintaining spanning trees and preventing loops. 

Huawei group management protocol (HGMP) is used for managing network topology and devices in a 

network.  

When multiple branch networks of an organization are connected together through a public network, 

you can combine the corresponding network nodes into one so as to maintain the branch networks as a 

whole. This requires the packets of some of the user’s Layer 2 protocol packets be transmitted across 

the provider’s network without getting involved in the computation of the public network.  

The BPDU Tunnel feature is designed to address the above requirements. It enables some Layer 2 

protocol packets of private networks to be transmitted along tunnels established in the public network.  

Different from the processing of data packets, a Layer 2 protocol packet is classified first when it 

reaches a network device. A Layer 2 protocol packet conforming to IEEE standards carries a special 

destination MAC address (for example, the destination MAC address of an STP protocol packet is 

0180-c200-0000) and contains a type field. Some proprietary protocols adopt the same packet structure, 

where a private MAC address is used to identify the corresponding proprietary protocol, and the type 

field is used to identify the specific protocol type. 

As shown in 

, the network on the top is the service provider network, and the one on the 

bottom is a customer network. The service provider network contains edge devices connecting the 

customer network to the service provider network. The customer network contains Network A and 

Network B. You can make the BPDU packets of the customer network to be transmitted in the service 

provider network transparently by enabling the BPDU tunnel feature on the edge devices at both ends 

of the service provider network.