could any one help me "" some thing i dont understand"" from the book

[Dr.X]

im stydying ccnp route from cisco press book , and especially in  chapter 4 when dealling  with route summarization .

actually in the pages 117-118 the subject is

Influencing the Choice of Best Route for Summary Routes

actually i read it more times and i couldnot undertanad what does it tlak about

i enclosed the  figure , and im wondering why we have two summary routes from many sources ????does that make a problem in the network??

if any one could help me and give me a summary about the subject

thanks alot

[vmiller]

take a look at the columns to the right of the routes. thats the admin distance being specified. they are reversed between

the two wan routers. This will set the preference, in that while both route prefixes are advertised, their preferences are different.

Whit this will do is, assume router 1 fails, the necessary routes are already in the router two table. its a neat little reduncancy scheme.