Hi, I´m looking for some books, best common pratices and stuff like that for ISPs. We have an ISP that´s having a fast growth and we´re having some problems because lack of procedures. For an example two days ago we have a broadcast storm that coused a lot of problem and was harsh to find who is causing that issue , couse one of our clients made a self install ( not authorized in one of our multipoint access point) and somehow caused a loop. we have some types of circuit delivery to our customers like point to point licensed microwave , t1/e1 , fiber optic, and point to multipoint wireless. How you large ISPs deal with that kind of problem or that´s never happen becouse all your circuits are delivered in a private vlan, qinq, serial interfaces, point to point ? Thanks! -- Gustavo Santos Analista de Redes CCNA , MTCNA , JUNCIA-ER