Bpdu Tunneling Configuration; Introduction To Bpdu Tunneling; Background - 3Com 4500G Family Configuration Manual

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BPDU Tunneling Configuration

BPDU tunneling support the transparent transmission of these types of Layer 2 protocol packets in
V05.02.00P19: CDP, DLDP, EOAM, GVRP, HGMP, LACP, LLDP, PAGP, PVST, UDLD and VTP.
When configuring BPDU tunneling, go to these sections for information you are interested in:

Introduction to BPDU Tunneling

Configuring BPDU Tunneling
BPDU Tunneling Configuration Examples
Introduction to BPDU Tunneling
As a Layer 2 tunneling technology, BPDU tunneling enables Layer 2 protocol packets from
geographically dispersed customer networks to be transparently transmitted over specific channels
across a service provider network.

Background

Customers usually use dedicated lines in a service provider network to build their own Layer 2 networks.
As a result, very often, a customer network is broken down into parts located at different sides of the
service provider network. As shown in
which belong to VLAN 100. User A's network is divided into network 1 and network 2, which are
connected by the service provider network. When Layer 2 protocol packets cannot be transparently
transmitted in the service provider network, User A's network cannot implement independent Layer 2
protocol calculation (for example, STP spanning tree calculation). In this case, the Layer 2 protocol
calculation in User A's network is mixed with that in the service provider network.
Figure 1-1 BPDU tunneling application scenario
CE 1
User A network 1
VLAN 100
With BPDU tunneling, Layer 2 protocol packets from customer networks can be transparently
transmitted in the service provider network:
Figure
PE 1
ISP network
1-1, User A has two devices: CE 1 and CE 2, both of
PE 2
CE 2
User A network 2
VLAN 100
1-1