This is our old Q&A Site. Please post any new questions and answers at

We are seeing an issue on one of our Ethernet switches(Juniper QFX3500) .Ports were shared across the team and each member is complaining that on their captures they are seeing the traffic not intended to them.

Further checking the mac table we identified that destination macs were not discovered by the switch and there is an entry i guess that is causing the issue which is shown below.In this case will all (for which dest mac were not discovered) fell in the category of unknown unicast and causing the flooding?

VLAN MAC address Type Age Interfaces

default * Flood - All-members

asked 26 Jun '13, 14:56

krishnayeddula's gravatar image

accept rate: 6%

Yes, switches will flood traffic to all ports in the vlan if the destination mac-address was not seen as a source yet.

See also the answers to this question...

permanent link

answered 26 Jun '13, 15:47

SYN-bit's gravatar image

SYN-bit ♦♦
accept rate: 20%

Your answer
toggle preview

Follow this question

By Email:

Once you sign in you will be able to subscribe for any updates here



Answers and Comments

Markdown Basics

  • *italic* or _italic_
  • **bold** or __bold__
  • link:[text]( "title")
  • image?![alt text](/path/img.jpg "title")
  • numbered list: 1. Foo 2. Bar
  • to add a line break simply add two spaces to where you would like the new line to be.
  • basic HTML tags are also supported

Question tags:


question asked: 26 Jun '13, 14:56

question was seen: 3,351 times

last updated: 26 Jun '13, 15:47

p​o​w​e​r​e​d by O​S​Q​A