If you want to have true 1:1 protection with the traffic receiving unchanged bandwidth guarantees during the failure, you have to dedicate half of the bandwidth to backup paths. If you're willing to reduce the available end-to-end bandwidth during the failure period, you can oversubscribe the ring and thus gain additional bandwidth during the normal operation of the ring.
However, please note that PBB-TE uses external network management system to provision end-to-end Ethernet Switched Paths (ESP) across the PBB-TE infrastructure. While the PBB-TE standard does not prohibit oversubscription -- in fact, the only time you'll find Quality of Service or per-ESP bandwidth mentioned is in the notes, not in the main text -- the capability to do it lies solely with the network management system.
Dig Deeper on Telecom Routing and Switching
Related Q&A from Ivan Pepelnjak
Telecom networking expert Ivan Pepelnjak details the similarities and differences between Infrastructure as a Service (IaaS) and multi-tenant ...continue reading
Telecom networking expert Ivan Pepelnjak breaks down the speed, bandwidth and security benefits of moving from a simple cable Internet connection to ...continue reading
Telecom networking expert Ivan Pepelnjak gives us a peek under the hood at what network technologies service providers use when designing cloud ...continue reading
Have a question for an expert?
Please add a title for your question
Get answers from a TechTarget expert on whatever's puzzling you.