Classless to Classful Redistribution

Classless to Classful Redistribution
The problem with classless to classful redistribution lies in the fact that a route that you are
attempting to redistribute to the classful routing protocol isn’t of classful boundaries. So
how do you overcome this? Careful planning. Summarization is the best means of resolving
this issue.
You need to first determine which of the routes that are going to be redistributed do not fall
on a classful boundary. Once you have determined this, you can summarize the routes. An
important item to note is if you are going to manually summarize a route, the route must be
summarized before it reaches the router that it will be redistributed on. If this does not occur,
the route will not be redistributed.