SNR S2940-8G-v2 Switch Configuration Guide
BPDU-Tunnel Configuration
Chapter 14
BPDU-Tunnel Configuration
14.1 Introduction to bpdu-tunnel
BPDU Tunnel is a Layer 2 tunnel technology. It allows Layer 2 protocol packets of geographically
dispersed private network users to be transparently transmitted over specific tunnels across a
service provider network.
14.1.1 bpdu-tunnel function
In MAN application, multi-branches of a corporation may connect with each other by the service
provider network. VPN provided by the service provider enables the geographically dispersed
networks to form a local LAN, so the service provider needs to provide the tunnel function, namely,
data information generated by user's network is able to inextenso arrive at other networks of the
same corporation through the service provider network. To maintain a local concept, it not only
needs to transmit the data within the user's private network across the tunnel, but also transmit
layer 2 protocol packets within the user's private network.
14.1.2 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 pro-
tocol calculation (for example, spanning tree calculation), so they affect each other.
99
To Next Page
Loading...
General