Special-Purpose Multiprotocol Label Switching (MPLS) Label Values
Created
- 2002-11-08
Last Updated
- 2026-06-30
Available Formats
Base Special-Purpose MPLS Label Values
Registration Procedure(s)
- Standards Action
Reference
- RFC 3032: MPLS Label Stack Encoding
- RFC 7274: Allocating and Retiring Special-Purpose MPLS Labels
- RFC 9017: Special-Purpose Label Terminology
Available Formats
| Value | Description | Reference |
|---|---|---|
| 0 | IPv4 Explicit NULL Label | RFC 3032 |
| 1 | Router Alert Label | RFC 3032 |
| 2 | IPv6 Explicit NULL Label | RFC 3032 |
| 3 | Implicit NULL Label | RFC 3032 |
| 4 | MPLS Network Actions | RFC 9994 |
| 5-6 | Unassigned | |
| 7 | Entropy Label Indicator (ELI) | RFC 6790 |
| 8-12 | Unassigned | |
| 13 | Generic Associated Channel Label | RFC 5586 |
| 14 | OAM Alert Label | RFC 3429 |
| 15 | Extension Label (XL) | RFC 7274; RFC 9017 |
Extended Special-Purpose MPLS Label Values
Registration Procedure(s)
- Standards Action
Reference
- RFC 7274: Allocating and Retiring Special-Purpose MPLS Labels
Available Formats
| Value | Description | Reference |
|---|---|---|
| 0-15 | Reserved. Never to be made available for allocation. | RFC 7274 |
| 16 | Metadata Label Indicator (MLI) | RFC 8595 |
| 17 | Metadata Present Indicator (MPI) | RFC 8595 |
| 18 | Flow-ID Label Indicator (FLI) | RFC 9714 |
| 19-239 | Unassigned | |
| 240-255 | Reserved for Experimental Use | RFC 7274 |
| 256-1048575 | Reserved. Not to be made available for allocation without a new Standards Track RFC to define an allocation policy. | RFC 7274 |