implicit (label value of 3) and explicit (label value of 0) null labels are used by the router terminating an LSP to tell the penultimate hop how to behave when sending traffic along the LSP. An implicit null means that the penultimate hop router has to pop the label before forwarding to the egress router and explicit null means swap the incoming label with a label value of 0 (explicit null). The explicit null is sometimes used to convey the MPLS QOS value down to the egress router (sometimes refer to the pipe mode).
Refer to the following document for more information on the pipe mode.
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