From: Chua, Parry (Parry.Chua@xxxxxxxxxx)
Date: Sun Feb 10 2002 - 23:42:16 GMT-3
I would like to share with the team on my understanding about default
route.
Since default route is for any network no match in routing table, it
mean that if you want to inject a default route from your router, it
need to know where is the default route goto. Examine your router for a
reachable classful network ouside your own network is a good candidiates
for default route.
Some routing protocols allow you to generate a default route without
having a route to 0.0.0.0/0, it is your responsibility to ensure that
there is a place for the default route
( null 0 is also a choice) and ensure that no routing loop should occur
in the topology.
Parry Chua
-----Original Message-----
From: Elsayed Mohamed [mailto:elsayedm@hotmail.com]
Sent: Monday, February 11, 2002 9:56 AM
To: neiby@ureach.com; bgrafals@knology.net; ccielab@groupstudy.com
Subject: Re: default route in ospf
Hello all,
There are three ways to inject a default route into OSPF (IP
default-network
is not one of them)
1- If the area you injecting the default route in is a normal area (not
stub, nssa or totally stubby), you must use the command
DEFAULT-INFORMATION
ORIGINATE. Use the key work always if the router does not have a default
route.
2- If the area is NSSA, you must use the command
AREA X NSSA DEFAULT-INFORMATION ORIGINATE at the NSSA ABR. A default
route
will be injected even the NSSA ABR does not have a default route itself.
3- If the area you injecting the default route in is stub or totally
stubby
area, NOTHING IS NEEDED. The ABR to the stub area will inject a default
route in the stub/totally stubby area by default.
Elsayed Mohamed
----Original Message Follows----
From: John Neiberger <neiby@ureach.com>
Reply-To: John Neiberger <neiby@ureach.com>
To: "Bob Grafals" <bgrafals@knology.net>, ccielab@groupstudy.com
Subject: Re: default route in ospf
Date: Sun, 10 Feb 2002 10:42:50 -0500
I don't believe that OSPF uses 'ip default-network'. To
originate a default route with OSPF, use 'default-information
originate [always]'.
John
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