From: Jayson Tobias (jaysont@aos5.com)
Date: Fri Jun 24 2005 - 18:15:54 GMT-3
Lee -
I believe the "no" version of this command removes the summarized route
to Null for the corresponding area # range command. For example -
Router ospf 100
area 4 range 110.99.0.0 255.255.0.0
#sho ip route
...
C 110.99.7.7/32 is directly connected, Loopback0
O 110.99.0.0/16 is a summary, 00:02:02, Null0
O 110.99.1.32/27 [110/74] via 110.99.50.5, 00:02:03, Ethernet0/0
router ospf 100
no discard-route internal
area 4 range 110.99.0.0 255.255.0.0
C 110.99.7.7/32 is directly connected, Loopback0
O 110.99.1.32/27 [110/74] via 110.99.50.5, 00:02:31, Ethernet0/0
The Null route is no longer there... so the "discard-route internal" is
the default form of the command, and therefore doesn't show up in the
config...
HTH,
Jayson
PS - The 28th, right? Good luck...
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Lee Carter
Sent: Friday, June 24, 2005 3:53 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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