PBB or provider backbone


advantages  solve VPLS scaling issues

MAC address explosion or scaling issue
( the provider does not need to know the end client MAC address )

reduce mac learning in the core

after failure, withdraw and relearn MAC@

PE will learn only the remove PE pbb's MAC@
NokiaEncapsulation of client traffic + Service ID ( here VPLS )

https://www.youtube.com/watch?v=Rmlk_xIi0rA&ab_channel=Nokia