From: ccie2be (ccie2be@nyc.rr.com)
Date: Fri Jun 24 2005 - 18:23:42 GMT-3
Here's how I understand it.
When you create a summary (either type)in ospf, ospf, by default, will
create a static route pointing to the null interface. This is the discard
route because any packets sent to this summary address will be discarded
which is usually what you want done.
But, suppose you don't want ospf to auto-magically create this static route?
Then, you would use the "no discard-route" command. But, then, if you
change your mind, you, "To reinstall either an external or internal discard
route that was previously removed, use the discard-route command in router
configuration mode".
HTH, Tim
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of Lee
Carter
Sent: Friday, June 24, 2005 4:53 PM
To: CCIE LAB
Subject: ospf discard-route external... please explain.
All,
I am having a difficult time understanding exactly
what the discard-route command does under the ospf
router configuration sub-command.
I konw what the generic deffinition is:
discard-route
To reinstall either an external or internal discard
route that was previously removed, use the
discard-route command in router configuration mode. To
remove either an external or internal discard route,
use the no form of this command.
discard-route [external | internal]
no discard-route [external | internal]
Syntax Description
external
(Optional) Reinstalls the discard route entry for
redistributed summarized routes on an Autonomous
System Boundary Router (ASBR).
internal
(Optional) Reinstalls the discard-route entry for
summarized internal routes on the Area Border Router
(ABR).
I don't quite grasp what they are trying to do here.
Some explaination in different terms may be helpfull.
Thanks,
Lee
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