▁cities . ▁An ▁organization ▁has ▁an ▁office ▁in ▁each ▁city . ▁The ▁organization ▁requires ▁connect ivity ▁between ▁these ▁two ▁offices . ▁ ▁The ▁I SP ▁will ▁have ▁access ▁to ▁a ▁Po P ▁in ▁each ▁city ▁and ▁therefore ▁has ▁a ▁link ▁between ▁the ▁Po P s . ▁To ▁connect ▁the ▁offices ▁to ▁the ▁Po P s , ▁a ▁connection ▁via ▁the ▁local ▁loop ▁will ▁be ▁commission ed ▁for ▁each ▁office . ▁ ▁In ▁this ▁way , ▁an ▁N PL C ▁is ▁delivered . ▁ ▁See ▁also ▁▁ ▁General ized ▁Multi - Protocol ▁Label ▁Switch ing ▁ ▁M PL S ▁V PN ▁ ▁Per - h op ▁behavior ▁ ▁Virtual ▁private ▁L AN ▁service ▁ ▁Label ▁Information ▁Base ▁ ▁IE EE ▁ 8 0 2 . 1 a q ▁- ▁Short est ▁Path ▁Br id ging ▁( SP B ) ▁ ▁Notes ▁ ▁References ▁ ▁Further ▁reading ▁▁ ▁" Dep loy ing ▁IP ▁and ▁M PL S ▁Q o S ▁for ▁Mult iser vice ▁Network s : ▁Theory ▁and ▁Pract ice " ▁by ▁John ▁Evans , ▁Clar ence ▁Fil s fil s ▁( M organ ▁Kauf mann , ▁ 2 0 0 7 , ▁) ▁ ▁Rick ▁Gal la her ' s ▁M PL S ▁Training ▁Guide ▁() ▁ ▁External ▁links ▁▁ ▁M PL S ▁Working ▁Group , ▁I ET F . ▁ ▁M PL S ▁IP ▁Spec ifications , ▁Broad band ▁Forum . ▁ ▁A ▁brief ▁history ▁of ▁M PL S , ▁R I PE ▁ ▁Category : MP LS ▁networking ▁Category : Internet