▁for ▁traffic ▁engineering . ▁Furthermore , ▁there ▁exist ▁extensions ▁of ▁the ▁Border ▁Gate way ▁Pro tocol ▁( B GP ) ▁that ▁can ▁be ▁used ▁to ▁manage ▁an ▁M PL S ▁path . ▁ ▁An ▁M PL S ▁header ▁does ▁not ▁identify ▁the ▁type ▁of ▁data ▁carried ▁inside ▁the ▁M PL S ▁path . ▁If ▁one ▁wants ▁to ▁carry ▁two ▁different ▁types ▁of ▁traffic ▁between ▁the ▁same ▁two ▁rou ters , ▁with ▁different ▁treatment ▁by ▁the ▁core ▁rou ters ▁for ▁each ▁type , ▁one ▁has ▁to ▁establish ▁a ▁separate ▁M PL S ▁path ▁for ▁each ▁type ▁of ▁traffic . ▁ ▁Mult ic ast ▁address ing ▁Mult ic ast ▁was , ▁for ▁the ▁most ▁part , ▁an ▁after - th ought ▁in ▁M PL S ▁design . ▁It ▁was ▁introduced ▁by ▁point - to - multip oint ▁R SV P - TE . ▁It ▁was ▁driven ▁by ▁service ▁provider ▁requirements ▁to ▁transport ▁broad band ▁video ▁over ▁M PL S . ▁Since ▁the ▁in ception ▁of ▁ ▁there ▁has ▁been ▁a ▁trem end ous ▁sur ge ▁in ▁interest ▁and ▁deployment ▁of ▁M PL S ▁mult ic ast ▁and ▁this ▁has ▁led ▁to ▁several ▁new ▁develop ments ▁both ▁in ▁the ▁I ET F ▁and ▁in ▁sh ipping ▁products . ▁ ▁The ▁hub & sp oke ▁multip oint ▁L SP ▁is ▁also ▁introduced ▁by ▁I ET F , ▁short ▁as ▁H S MP ▁L SP . ▁H S MP ▁L SP ▁is ▁mainly ▁used ▁for ▁mult ic ast , ▁time ▁synchron ization , ▁and ▁other ▁purposes . ▁