Cisco employees whose age plus years served equal 65...make sure you sign up for Cisco RMAP (retirement insurance) before departure, if qualified.
If LR'd: check with Benefits if they will suspend RMAP until after COBRA. If so, you can sign up for RMAP's cheapest option: VSP vision (then decline vision at your new job). This will "hold your place" in retirement coverage if you ever need it. If you are without a job after COBRA suspends (which I hope you are not!), you can easily revert to full coverage under RMAP. It's not cheap, but no health insurance is...
Leaving because new job: (congratulations!) It is still a good idea to keep the RMAP option open if available to you. Just sign up for RMAP's VSP vision to start. This will "hold your place" in retirement health insurance if you ever need expanded coverage.
Many people are retiring earlier than 65, when Medicare kicks in, so you'll still need to cover your health insurance before that time. You never know when you may be without it and going it alone on the open market can be tedious and in many cases just as expensive if not more. If you ever need to increase your health coverage due to a life change, you can easily turn on the additional coverages under RMAP.
Hope this makes sense. If not, I encourage you to research Cisco RMAP if you qualify, because if you don't do it before you leave, you can't go back and sign up. When I left Cisco, this is what I did and I retired at 62. I had a similar scenario from my last company so now I have two from which to choose until Medicare at 65. Gives me some peace of mind.
Good luck, everyone!