RFC 7030 and CSR recreation due to new session causing new tls-unique value

RFC 7030 section 3.2.1 at 
https://tools.ietf.org/html/rfc7030#section-3.2.1 states "Additionally, 
if the client has already generated a CSR that includes linking identity 
and POP information (Section 3.5), then the CSR will need to be 
recreated to incorporate the tls-unique from the new, redirected session."

RFC 7030 section 4.2.3 at 
https://tools.ietf.org/html/rfc7030#section-4.2.3 states "If the client 
closes the TLS connections while waiting for the Retry-After time to 
expire, then the client initiates a new TLS connection and performs all 
applicable security checks.  If the client has already generated a CSR 
that includes linking identity and POP information (Section 3.5), then 
the CSR will need to be recreated to incorporate the tls-unique from the 
new, redirected session."

Where is the code that fulfills this requirement? I have not been able 
to locate it.

I am sorry for asking such a stupid question. I am new here.

Thank you.

Very Respectfully,

Michael Ross