SPB concept

Hello Sai

SBP is defined in IEEE 802.1aq and is essentially an attempt at replacing the more traditional spanning tree protocols. The primary weakness of traditional STP, is the blocking of redundant paths. SBP doesn’t block paths, but allows an infrastructure to load balance across multiple paths while at the same time avoiding loops. This is a huge step forward as it increases efficiency immensely. It is designed to function with a “plug and play” philosophy, allowing little or no human intervention in its configuration.

Even though its working group was founded in 2006 and its first widespread production network deployment was at the 2014 Olympic games, its adoption by major vendors has been slow. Cisco has clearly stated that it is not going to support SBP any time soon.

There are alternatives to SPB including Multi-Chassis Link Aggregation and VXLANs, but the most direct competitor is called Transparent Interconnect of Lots of Links (TRILL). This is the direction that Cisco is going.

Even though I don’t usually link to Wikipedia articles, I’ll make an exception here. The following is a very well written, comprehensive, and clear description of SPB, includes detailed examples and diagrams, and is worth a read if you’re interested in the standard:

I hope this has been helpful!