Chapter 3 Bpdu Tunnel Configuration; Bpdu Tunnel Overview; Introduction To The Bpdu Tunnel Feature; Bpdu Tunnel Fundamental - H3C S3100-52P Operation Manual

Operation Manual – VLAN-VPN
H3C S3100-52P Ethernet Switch

Chapter 3 BPDU Tunnel Configuration

Note:
Two features, the BPDU Tunnel support for packets of multiple protocols and adjusting
tunnel packet MAC addresses, are newly added. For details, refer to
Configuration.
When configuring BPDU tunnel, go to these sections for information you are interested
in:

BPDU Tunnel Overview

BPDU Tunnel Configuration
Displaying and Maintaining BPDU Tunnel Configuration
BPDU Tunnel Configuration Example
3.1 BPDU Tunnel Overview

3.1.1 Introduction to the BPDU Tunnel Feature

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.

3.1.2 BPDU Tunnel Fundamental

I. Layer 2 protocol packet identification
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
Chapter 3 BPDU Tunnel Configuration
3-1
BPDU Tunnel