Server Fault is a question and answer site for system and network administrators. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

Does a port mirror send ethernet frames out of the switch-port with the 802.1Q header bytes still on the frame?

share|improve this question
up vote 4 down vote accepted

By default, no. However, the behavior can be controlled on the monitor command; the encapsulation argument controls this. replicate will preserve the encapsulation type that the packet had in transit, while dot1q will force the 802.1Q header.

share|improve this answer
    
Great answer. Thank you very much. – Ablue May 24 '11 at 5:35

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

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