Internet Assigned Numbers Authority

                                          Special-Purpose Multiprotocol Label Switching (MPLS) Label Values

   Created
   2002-11-08

   Last Updated
   2024-09-16

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   Registries included below

     • Base Special-Purpose MPLS Label Values
     • Extended Special-Purpose MPLS Label Values

Base Special-Purpose MPLS Label Values

   Registration Procedure(s)

 Standards Action

   Reference
   [RFC3032][RFC7274][RFC9017]

   Available Formats
   [IMG]
   CSV

   Value           Description                Reference
     0   IPv4 Explicit NULL Label         [RFC3032]
     1   Router Alert Label               [RFC3032]
     2   IPv6 Explicit NULL Label         [RFC3032]
     3   Implicit NULL Label              [RFC3032]
    4-6  Unassigned
     7   Entropy Label Indicator (ELI)    [RFC6790]
   8-12  Unassigned
    13   Generic Associated Channel Label [RFC5586]
    14   OAM Alert Label                  [RFC3429]
    15   Extension Label (XL)             [RFC7274][RFC9017]

Extended Special-Purpose MPLS Label Values

   Registration Procedure(s)

 Standards Action

   Reference
   [RFC7274]

   Available Formats
   [IMG]
   CSV

      Value                                           Description                                                        Reference
      0-15     Reserved. Never to be made available for allocation.                                      [RFC7274]
       16      Metadata Label Indicator (MLI)                                                            [RFC8595]
       17      Metadata Present Indicator (MPI)                                                          [RFC8595]
       18      Flow-ID Label Indicator (FLI)                                                             [RFC-ietf-mpls-inband-pm-encapsulation-18]
     19-239    Unassigned
     240-255   Reserved for Experimental Use                                                             [RFC7274]
   256-1048575 Reserved. Not to be made available for allocation without a new Standards Track RFC to    [RFC7274]
               define an allocation policy.

   Licensing Terms