RE:OSPF discard-route internal/external

From: huang tao (huangtao1968@hotmail.com)
Date: Sat Apr 02 2005 - 06:00:24 GMT-3

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I think when we summarize in OSPF, a null0 route will be added, but it can
be removed with the command : no discard-route external

Hi, All
"discard-route internal/external" is turned on by default to prevent
routing loop in case of summary address overlap, backup link:
http://cisco.com/en/US/tech/tk365/technologies_white_paper09186a0080094e9e.shtml#t28

what I don't know is: under what condition it's not needed? (=no
discard-route internal/external)
my thought on this one is: Even you don't have overlapped summary
addresses, it's always a good idea to have it there (unless the goal
is to minimize the routing table?)

Any comments?

Thanks,
Pat

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