Hi Suresh,
explicit-null only to be configured on Egress rotuer
Explicit Null
When Explicit Null is configured a label value of 0 is signalled to the penultimate router which instructs the router to push an MPLS Shim Label onto packets that are destined for the final hop. In certain cases the requirement for Explicit Null may be desirable, for example to maintain CoS values attributed to the LSP, as the CoS value would normally be discarded at the penultimate router if PHP were enabled.
Configuration Examples
When enabled Explicit Null will pass a label value of 0 downstream from the tail end router so should be applied at this point in the network.
For RSVP the feature is configured under the MPLS protocol heirarchy and will apply to all egress LSPs signalled by RSVP:
set protocols mpls explicit-null
To apply the feature to LDP the statement is configured directly under the LDP protocol heirarchy and will apply to all LDP signlled LSPs:
set protocols ldp explicit-null
Hope this helps
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