Technical Summary
The label stack encoding for MPLS (Multi-protocol Label Switching)
defines a reserved label value known as "IPv4 Explicit NULL" and a
reserved label value known as "IPv6 Explicit NULL". Previously,
these labels were only legal when they occurred at the bottom of the
MPLS label stack. This restriction is now removed, so that these
label values may legally occur anywhere in the stack.
Working Group Summary
The Working Group had a consensus on advancing this document.
Protocol Quality
The Document has been reviewed for the IESG by Alex Zinin. The document
has been reviewed by the RTG area directorate (Danny McPherson).