While I don't know the OP I'm not going to doubt their numbers. Here's why:
There's a lot more to salary than your grade level. How many times you got promoted, how many raises did you get and what were the budgets like determine how much of a increase you get
Someone who just stays on the same team and gets promoted to a G9 will always earn less than people who apply and get new internal jobs. When promoted there's a max increase you can get. When accepting a new internal job you can negotiate salary more freely
Anyone that goes from the corporate pay plan to the sales plan will immediately get around a 20% raise right there due to the sales plan paying more
When you start at Cisco also determines your pay. I started in 2012 at 75k base. The very next year starting pay for the exact same job was 62.5k
I'm also a G9 in RTP with a base of 144k. A little more than the poster. I didn't do anything special to get it just a combination of the above as I built experience