MPLS Network Actions
Multiprotocol Label Switching Architecture (MPLS)
2026-03-05
2026-08-26
Network Action Flags Without Ancillary Data
0-14
IETF Review
15-16
Experimental Use
17-19
Private Use
20-439
IETF Review
Network Action Opcodes
1-110
IETF Review
111-114
Experimental Use
115-126
Private Use
127
IETF Review
0
Reserved
Not Applicable
1
Flag-Based Network Action Indicators without AD
In-Stack Only
2
No operation Opcode
In-Stack and Post-Stack
3
13-bit NRP Selector
In-Stack Only
4
20-bit NRP Selector
In-Stack Only
5
20-bit Entropy and NRP Selector
In-Stack Only
6
Post-Stack MPLS Header Start Offset
In-Stack Only
7
Post-Stack MPLS Header End Offset
In-Stack Only
8-110
Unassigned
In-Stack and Post-Stack
111-114
Reserved for Experimental Use
In-Stack and Post-Stack
115-126
Reserved for Private Use
In-Stack and Post-Stack
127
Opcode Range Extension Beyond 127
In-Stack and Post-Stack