Hi All,

As per RFC 8669 3.1. 
<https://datatracker.ietf.org/doc/html/rfc8669#section-3.1> Label-Index 
TLV<https://datatracker.ietf.org/doc/html/rfc8669#name-label-index-tlv>
The Label-Index TLV MUST be present in the BGP Prefix-SID attribute attached to 
IPv4/IPv6 Labeled Unicast prefixes

Label-Index TLV is not mandatory in BGP Prefix-SID attribute attached to 
IPv4/IPv6 Labeled Unicast prefixes, after below draft (srv6 support for BGP-LU 
family)
https://datatracker.ietf.org/doc/draft-agrawal-bess-bgp-srv6-mpls-interworking/

Thanks
Rajesh



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