I think it depends on the school and the type of bullying. Yeah they do the whole anti-bullying weeks etc but there is rarely any real change. At my school if someone was getting beat up the teachers/supervisors wouldn't usually get involved, we'd actually have students running in to break up the fights. If it's name calling and verbal abuse, depending on who you report it to, you might get told to man up/get over it/ignore them. Having being a victim of bullying myself once ignoring them is a lot easier said than done.
On the other hand I think it depends on who you report it to. Sometimes you get that one gem of a teacher who you can count on, if someone was to tell one of my teachers they were being bullied or he saw someone being bullied he'd go right in and sort it
He would also be the first person to dive in and stop anything physical (I think him being the size of a frickin door helped that).
It's even worse when you have teachers bullying students, even though they adamantly deny it. Everything they do is what they try telling you is bullying, yet when it's a teacher doing it to a pupil it doesn't count? I had issues with one of my teachers and when I eventually mentioned it I suddenly had upper management and other teachers giving me ****, calling me a liar etc etc. So in my mind they were completely ignoring what was taking place, even tried to cover it up and run my name through mud. It wasn't until one teacher took the time to speak to them did it eventually sort itself out for the most part, it was definitely the worst couple of months at school though.
More often than not I'd say that it was students that had to step in, and not the people who were SUPPOSED to.