In one of the MPLS-related posts, I've described the role of implicit NULL in penultimate hop popping (PHP). To make the distinction between implicit and explicit NULL even clearer, I've prepared a short explanation with corresponding diagrams.
Ivan Pepelnjak, CCIE#1354, is the chief technology advisor for NIL Data Communications. He has been designing and implementing large-scale data communications networks as well as teaching and writing books about advanced technologies since 1990. See his full profile, contact him or follow @ioshints on Twitter.
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