Question on bridged interfaces and broadcast traffic

RouterOS General
1

Can someone help me understand the routing/broadcast effect the following scenario comparisons have on network traffic? What I am wondering is given scenario number 1, it will obviously make layer 3 decisions for traffic that needs to cross each interface and associated subnets which also breakup broadcast traffic.

My big question is that if I set it up as in scenario number 2, does the router still make layer 3 decisions and breakup broadcast traffic or does the router see the bridge as a layer 2 decision and therefor everything on those 3 interfaces get the broadcast traffic? Hope this makes sense…

  1. I have three interfaces on a Mikrotik, each interface addressed as follows. 192.168.1.1, 192.168.2.1, and 192.168.3.1.

  2. I create a bridge out of three interfaces and just assign the bridge with an address of 192.168.1.1

2

Maybe I misunderstand your question, but it seems obvious to me that if the three interfaces have different address ranges, they will not share broadcast traffic, whereas if they share the same address range through a bridge or switch, they will all share the broadcast traffic. The switch can’t make any intelligent decisions about where the traffic should be sent, because by definition broadcast traffic must be sent everywhere. Am I misunderstanding your question?


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