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Cisco ASR 1000 Series Aggregation Services Routers Software Configuration Guide
OL-16506-17
Chapter 16 Configuring MPLS Layer 2 VPNs
Virtual Private LAN Services
In order for this to work, the pair of nPEs are programmed to send out BPDUs on the access ring ports
in such a way that they appear to be either:
• The root bridge itself (the bridge with the lowest bridge ID or priority).
• The bridge with the second lowest bridge ID or priority, and with a 0 cost path to the root.
Using R-L2GP, you can statically configure the BPDUs instead of the STP generate the BPDUs
dynamically.
Figure 16-1 shows the topology of multiple-access networks connected to redundant nPEs.
Figure 16-1 Multiple-Access Networks Connected to Redundant nPEs
BPDUs Sent Out of R-L2GP Ports
An R-L2GP module in a route processor (RP) generates static preconfigured BPDUs, and sends them to
uPEs via access ports, with the R-L2GP enabled.
Note Only localy generated static BPDUs can be sent out to RL2GP ports.