It also supports " single touch " provisioning, so that configuration is simple and robust; the port of a virtual server must simply be bound locally to the SPBM I-SID identifying the LAN segment, after which IS-IS for SPB floods this binding, and all nodes that need to install forwarding state to implement the LAN segment do so automatically.
22.
The above rules over-simplify the situation slightly, because it is possible that there are ties, for example, the root bridge may have two or more ports on the same LAN segment, two or more ports on a single bridge are attached to least-cost paths to the root or two or more bridges on the same network segment have equal least-cost paths to the root.
