How come the manager call this person back when he thiks this person is a poor performer, just to show case him that he doesn't want to spoin the life? What happen to cisco standards.
OP, you're an a$$. Many people, smart and hard working people, have been LR'd by Cisco. It's not because they're poor performers like you who can't spell or type.
Many of them were mid-career (over 40), expensive due to yrs of experience, or both. They were let go due to budget issues, not performance. Cisco would rather have 2-3 grade 6 employees instead of 1 grade 8 or 10 with 15+ yrs experience.
As to bring ex-Cisco employees back w/o interviewing. It's a pretty common thing even if they don't come back to the same team because managers will talk to other managers, or they interacted with them in some way and knew their work. Many times, these ex-employees come back as contractors therefore there's no interview and they get converted later. If they're lucky, they can come back directly w/o wasting time as a contractor again.
It's all about your work ethic and how you leave a company that gets you the next job, or the job after that because it's a small world and people know you or know people who know you. I've been asked if I know a candidate because we worked at the same company or client at the same time and a hiring manager wants to know about them. If they were a slacker, deadwood, or just a poor performer or annoying to team mates, I'm not going to recommend that they be offered a chance to join a team I'm working on.