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BPDU Tunneling Configuration
BPDU tunneling support the transparent transmission of these types of Layer 2 protocol packets in
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05.02.00P19
: 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:
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Introduction to BPDU Tunneling
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Configuring BPDU Tunneling
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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
Figure 1-1
, User A has two devices: CE 1 and CE 2, both of
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
ISP network
User A network 1
VLAN 100
User A network 2
VLAN 100
CE 1
CE 2
PE 1
PE 2
With BPDU tunneling, Layer 2 protocol packets from customer networks can be transparently
transmitted in the service provider network:
