I passed my BSCI in March of 08, and my BCMSN in September of 08. I took these tests not knowing that you need a valid CCNA as a prerequisite. Unfortunately I let it expire.
Anyway I'm currently planning to retake the CCNA in a month, and then continue with my final 2 CCNP tests.
The way I understand it, if I passed my BSCI in March of 08, I have until March of 2011 to pass CCNA and the last 2 CCNP tests to become CCNP certified.
Hopefully that's not too confusing, and I'm doing the right thing.