Introduction - If you have any usage issues, please Google them yourself
This is a switch used in a unidirectional link detection protocol UDLD a specific implementation steps. I am looking for a long time to find, because now no one to look into this, but this thing is very important for high-end switches, of course, This is the CISCO invention, the document I translated a part of, but still quite imperfect, who are interested friends can join together to translate, can contact me: QQ 48150181 Email: songshiyou888@163.com hope that there are more friends to join, to improve their level of scientific research