From: ccie2be (ccie2be@nyc.rr.com)
Date: Wed May 26 2004 - 13:49:47 GMT-3
Hi David,
If I remember correctly, this command could come into play when you
configure a summary in ospf.
For example, suppose you configure summary route on an ABR with the area x
range command. By default, ospf installs in the route table a route to the
null0 interface for the summary. In other words, if this router receives
any packets with a destination address of the summary itself, when the
router does a route lookup in the route table, it will find the route to the
null0 interface and discard the packet.
This makes sense because how can router route packets to a network that
doesn't actually exist which is what a summary network is, right?
So, getting back to your question, the summary route ospf installs in the
route table pointing to null0 is a "discard route".
What's confusing, though, is that this command isn't normally used because,
by default, ospf creates a "discard route" when you configure a summary
route. But, what if you don't want ospf to create a discard route? No
problem, just issue the "no discard route" command.
Unfortunately, I don't remember why you would want to do that. My memory is
very limited, but, hopefully, someone with a better memory than myself will
jump in here to answer that question.
HTH
----- Original Message -----
From: "David Hurtado" <dei2viccie@hotmail.com>
To: <ccielab@groupstudy.com>
Sent: Wednesday, May 26, 2004 12:04 PM
Subject: "discard-route" command
> Hello everybody,
>
> I'm trying to understand the function of the command: "discard-route". I
> have read the command explantion on DocCD several times and i have looked
> for an example in cisco.com, but i have not found any didactic
explanation.
>
> Would you mind to tell me where i can get a good example or explanation of
> the use of this command?
>
> Thanks a lot
>
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