Also answering your other thread:
First, you should ask yourself if you really need certificates on the switches. If not, just remove them.
The above number is a random value to make sure the automatically configured trustpoint is unique.
You can see the expiration date of the certificates with "show crypto pki certificates".
The easy way to get new certificates is to remove the trustpoint and certificates, remove the "ip http secure-server" and put the "ip http secure-server" back in. The switch will generate a new certificate. Before that make sure your IOS is updated to a very new release.
If you really need HTTPS on a couple of switches it would be better to go the clean way. Get a certificate from your internal CA or if you do not have one, generate one on your local PC with openssl or something similar:
https://www.feistyduck.com/books/openssl-cookbook/
https://sourceforge.net/projects/xca/
