Special-Purpose Multiprotocol Label Switching (MPLS) Label Values
Multiprotocol Label Switching Architecture (MPLS)
2002-11-08
2026-03-05
Base Special-Purpose MPLS Label Values
Standards Action
0
IPv4 Explicit NULL Label
1
Router Alert Label
2
IPv6 Explicit NULL Label
3
Implicit NULL Label
4
MPLS Network Actions
5-6
Unassigned
7
Entropy Label Indicator (ELI)
8-12
Unassigned
13
Generic Associated Channel Label
14
OAM Alert Label
15
Extension Label (XL)
Extended Special-Purpose MPLS Label Values
Standards Action
0-15
Reserved. Never to be made available for allocation.
16
Metadata Label Indicator (MLI)
17
Metadata Present Indicator (MPI)
18
Flow-ID Label Indicator (FLI)
19-239
Unassigned
240-255
Reserved for Experimental Use
256-1048575
Reserved. Not to be made available for allocation without a new Standards Track
RFC to define an allocation policy.