RFC 8223, "Application-Aware Targeted LDP", August 2017Source of RFC: mpls (rtg)
Errata ID: 5584
Publication Format(s) : TEXT
Reported By: Jayant Bhardwaj
Date Reported: 2018-12-27
Section 2.3.2 says:
1. The S-bit of the TAC is set to 1 or 0 to advertise or withdraw it.
It should say:
1. The E-bit of the TAC is set to 1 or 0 to advertise or withdraw it.
My understanding of this RFC suggests that in order to Advertize or Withdraw TAC , the bit E in TAC is used. In Point # 1 of section 2.3.2, it is mentioned that bit S is used. Looks this is Editorial mistake.