Cisco 4500M Software Manual page 294

Understanding Layer 2 Protocol Tunneling
Customer A's Site 1 will build a spanning tree on the switches at that site without considering
convergence parameters based on Customer A's switch in Site 2.
spanning tree topology.
Figure 19-4 Layer 2 Protocol Tunneling
Figure 19-5 Layer 2 Network Topology without Proper Convergence
Software Configuration Guide—Release 12.2(25)EW
19-8
Customer A Site 1
VLANs 1 to 100
VLAN 30
VLAN 30
Switch 1
Switch 1
Switch 2
VLAN 40
Customer B Site 1
VLANs 1 to 200
Customer A
virtual network
VLANs 1 to 100
Chapter 19 Configuring 802.1Q and Layer 2 Protocol Tunneling
Figure 19-5
Service
provider
Trunk
Trunk
ports
ports
Trunk
Trunk
ports ports
VLAN 40
Trunk
Asymmetric link
shows one possible
Customer A Site 2
VLANs 1 to 100
VLAN 30
Switch 3
Switch 4
Customer B Site 2
VLANs 1 to 200
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