VLAN tutorial - Understanding menu "/interface bridge vlan"

RouterOS Beginner Basics
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  1. You are right, probably the code snippet, when applied to default config, does nothing and thus result isn’t as intended. On empty config, comnand “add” with similar properties has to be used.

  2. Bridge in ROS has two (or more, depends how thoroughly one divides them) personalitues: the switch-like entity which (on L2) connects member ports, and port/interface via which ROS (L3 part of it) communicates with other bridge ports. The config example shown in post is about the later. More about different bridge personalities in this thread.