What is the meaning of the new JunOS version numbers in the 12.1 line?

  • 12.1X44
  • 12.1X45
  • 12.1X46

What does the XNN mean? How can I tell which one I want?

2 Answers 2


X indicates that it is a aggressive feature train per KB27144 and TSB16034. The NN is a normal incremental version number.


NN in 12.1XNN means. Its a special branch version. The code has been specifically modified for a particular customer or for a particular fix. :)

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