PeerAdj SID sub-TLV
 -----------
 If Adj type = 1, Length should be 28 octets
 If Adj type = 2, Length should be 52 octets
 
 PeerNode SID sub-TLV
 -------------
 Length = (20 + No. of IPv4 interface pairs * 8 +
           No. of IPv6 interface pairs * 32) octets
 
 PeerSet SID sub-TLV
 -----------
 Length = (9 + No. of elements in the set *
          (8 + No. of IPv4 interface pairs * 8 +
           No. of IPv6 interface pairs * 32) octets