Route summarisation and discard route.

Hello experts,
I have questions about route summarisation and I am wondering why it behaves
differently in different routing protocols.

In OSPF discard route is installed automatically and there is a command to
remove it: "no discard-route internal" and "no discard-route external"
In EIGRP discard route is installed automatically but there is no command to
remove it.
Question 1: Why OSPF provides way to remove discard route but not EIGRP. Is
there a deep reason for that ?

In RIPV2 discard route is not installed automatically.
Question 2: Why there is no discard route in RIP ?
Question 3: Should a discard route be installed manually in RIP ? I mean as
a best practice, not in the Lab.

Thanks,

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Received on Mon May 30 2011 - 22:45:48 ART