In my opinion is the explanation about implicit and explicit NOT correct or really badly written.
Explicit null>> MPLS label is popped by next-to-last LSR and "normal" IP packet get's forwarded to last LSR (egress LSR)
Implicit null label: MPLS label is not taken of by next-to-last LSR, this retains MPLS EXP (QOS bits) so they can still be used by egress LSR
The value "Implicit NULL Label == 3" will only be communicated by egress LSR by LDP. When encapsulation takes place on the next-to-last LSR knows it can pop entire MPLS header as it previously has received the "implicit null value of 3 by means of LDP".
Above does mean that "LSR receives an MPLS header with the label set to 3" is actually incorrect.
My first entry was incorrect, see below for the correct text
Implicit null>> MPLS label is popped by next-to-last LSR and "normal" IP packet get's forwarded to last LSR (egress LSR)
Explicit null label: MPLS label is not taken of by next-to-last LSR, this retains MPLS EXP (QOS bits) so they can still be used by egress LSR
More info: https://www.networkworld.com/article/912436/cisco-subnet-understanding-mpls-explicit-and-implicit-null-labels.html
https://community.cisco.com/t5/mpls/implicit-null-and-explicit-null/td-p/1496792
Provides ways of improving load balancing by eliminating the need for DPI at transit LSRs
LSRs receives an MPLS header with the label set to 3
Packets is encapsulated in MPLS with the option of copying the IP priority copied to the EXP bit
Controls the amount of memory used to store LDP label bindings advertised by other devices
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