Is it a protocol of flooding to find the MAC address?

As we know, if the switch can not find a MAC address, it will flooding to every switchport except the entry port to find the corresponding MAC address.

does this method is a protocol?

1 Answer 1


No. A switch emulates a repeater hub when it doesn't know the destination's port. However, in practically all cases the switch does know the destination port due to the destination having transmitted a frame previously and the switch learning the source address (from any broadcast, an ARP response or the like).

The flooding doesn't help the switch learning unknown addresses, it's rather a workaround to make the bridge not break the layer-2 connectivity.

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.