Just FYI, we're running 16.09.03: I found the reference in google, and considered it antique.

In my experience, asking about token-bucket algorithm details is often
a sign for the asker to not see the forest for the trees.

The very first Cisco manual I found in a Google search explained how
to */set/* excess burst size (!)

https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/qos_plcshp/configuration/12-4/qos-plcshp-12-4-book.pdf 

IOS 12.4 is quite old.  I do not expect current documentation to have
improved significantly, but IOS 12.4 was a thing well before CoDel existed.

Looking at the current manual set, it emphasizes "Weighted Random Early Detection", and does not discuss the token-bucket algorithm at all, though pages describing QOS say it is used.

Amusingly, the page about WRED carefully repeats itself, suggesting a slight proofreading problem (;-)) https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/qos_conavd/configuration/xe-16/qos-conavd-xe-16-book/qos-conavd-oview.html

-- 
David Collier-Brown,         | Always do right. This will gratify
System Programmer and Author | some people and astonish the rest
davecb@spamcop.net           |                      -- Mark Twain