To cisck0k1d, I'm trying to summarize the ip 10.x.x.x in order to reduce the routing table in the routers of branch offices, because I also have some 2500 with little memory. To MADMAN: yes, of course, the DNS server has an ip 10.10.10.40, I have the ip classless in all the routers, the problem is the route pointing to Null0 created by IOS to avoid routing loops. I only manage the networks 10.50.x.x-10.60.x.x, to reach the rest of 10.x.x.x I use a default route with AD 200, after writing the ip summary address in any interface, the default route that I have (and that works fine) is overwritten by the other default route to 10.x.x.x pointing to Null0 because it has a little AD (5), and that's the problem. By the way, to put a higher cost in backup lines, I have used the delay 9000. I hope I have been more explicit this time. Thanks.
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