Expected network bridge/switch behavior

Posted on 2012-03-13
Medium Priority
Last Modified: 2012-03-19

Suppose a bridge/switch has learned a MAC address on certain port, meaning it has seen frames with source address equal to that MAC address coming from that port. Now it receives a frame with _destination_  address set to that MAC address from that port. What a bridge/switch it supposed to do? What standard/RFCs define the behavior of Ethernet switches and bridges in this situation?

Best regards,
Question by:gremwell
  • 2

Accepted Solution

gremwell earned 0 total points
ID: 37716839
Ok, I think I've found the answer myself. According to 802.1d standard, it looks like the bridge is supposed to simply avoid sending the frame back to the port it has received it from. I was asking that question because software switch implementation in POX (l2_learning) drops all packets from the "offending" port in this situation, which creates problems in my setup.

Expert Comment

ID: 37722487
can you please ask the same ques using some example??
not getting it.

Author Closing Comment

ID: 37736836
Found the answer myself.

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