I'm at Cisco this summer, in the group working on IP phones. To the OP, hope you don't get a low-level technician job, otherwise...well, your life might suck. My roommate while I'm here in San Jose complained endlessly about his job at Intel. Luckily he got hired elsewhere.
I don't find there is such a gap between interns and regular employees at Cisco. It's probably because they don't seem to group interns together. In fact, I haven't met another intern at the company yet, and I've been here 3 weeks. We have a mailing list that someone from HR put together for us, but we're spread through a lot of buildings (I'm in building 25, to give you an idea of how many) so it's not like the interns are expected to entertain themselves while people do work.