I can personally attest that you can come back to Cisco after being laid off. I've done it twice.
@1yjd - You can't come back during the 6-mo blacklist period even if you wanted to pay back the severance. I had a manager of a different team contact me about an FTE position on his team and ask me to contact HR to see if I could return the severance to return and the answer was no. A year later, that same manager hired me.
@1vqi - My animosity was more directed at the manager who targeted me. The first layoff, I knew I was going to be let go because I'd gotten on the manager's bad side and he put me on a performance improvement plan (PIP) and prevented me from applying to other positions within the company to get out from under his review. When I came back, I received full bonuses every year until I was laid off the second time, so I know my first layoff was not performance related, but personality related. The second time was a surprise, and another guy who was a top-performer got let go too. We're both back at Cisco now.
I enjoy my work & I enjoy working w/ my peers. My pay is good and my working conditions are great. I've worked at other companies and I was not nearly as happy. Maybe I've drunk too much of the Cisco cool aide, but I found the other companies had all the same problems that Cisco has and more, so why not work where I have over 10 yrs experience in getting things done at Cisco? While I hope they convert me to an employee a third time, I'll enjoy my time as a red-badge and no people deal and pocket all the $ I'm getting paid.