[c-nsp] Leaking specific routes from a VRF

[luismi]

Hi all,

We are doing some tests here with the code provided by Tomas.
We have several questions that we were not able to find a proper answer
over internet that we would like to share with you to see if we can
understand everything correctly:

a) "ip prefix-list" has a parameter called "le" so we can create the
rule like this: 

ip prefix-list FTP_NET seq 1 permit 10.53.0.224/29 le 32

Why is the reason to use "le" parameter? we saw it in several examples
over internet but we don't understand it yet.
What is the impact if we don't use it?

b) Is there any difference if we use a normal ACL instead a prefix-list
in the route-map? we also saw several configurations using ACLs and it
seems to do the same.

Regards and thanks in advance.