The MPLS WG Archive

["Sudhanshu Jain" <sjain@maplenetworks.com>]

Hi All,
   In draft-ietf-mpls-label-encaps-08.txt, in section 2.1 language has been
   changed to ....

              i. A value of 0 represents the "IPv4 Explicit NULL Label".
                 This label value is only legal at the bottom of the
                 label stack.  It indicates that the label stack must be
                 popped, and the forwarding of the packet must then be
                 based on the IPv4 header.


   From draft-ietf-mpls-label-encaps-07.txt, in section 2.1 ....

              i. A value of 0 represents the "IPv4 Explicit NULL Label".
                 This label value is only legal when it is the sole
                 label stack entry.  It indicates that the label stack
                 must be popped, and the forwarding of the packet must
                 then be based on the IPv4 header.

 
  Same stands for the bullet (iii).

  Does it mean, Label 0 and Label 2 are used to carry Protocol type
  at the "bottom of the label stack" in case of tunnel traffic?

  Is it the standard way to carry the protocol type in MPLS Tunnel traffic?

Thanks,

-Sudhanshu