From: Peter Van Oene (pvo@xxxxxxxxxxxx)
Date: Sun Apr 29 2001 - 12:49:56 GMT-3
Bringing a limited amount of external information into a stub area (one that do
es not allow the flow of type4/5 LSA's) is exactly the reason NSSA areas were c
reated. An ASBR cannot live in a normal stub as it needs to transmit Type 5 LS
A's which the area does not support. Further, the ABR needs to be aware of ASB
R's and originate Type 4's for the ASBR which it will not do when connected to
a normal stub.
By configuring NSSA, you allow the ABR to find the ASBR, and the ASBR to inject
the statics via Type 7 LSA's which a single ABR will translate into Type 5's t
o flow to the rest of the OSPF domain.
As far as how to do this, I highly recommend you do some research into the OSPF
process itself. For example, the network command in the ospf process merely i
dentifies interfaces to participate in the OSPF process and in no way signifies
prefixes to advertise. So yes, redistributing statics would be the basic metho
dology here.
Pete
*********** REPLY SEPARATOR ***********
On 4/28/2001 at 2:42 PM isp_ops@hotmail.com wrote:
>Is it possible to redistribute static routes into OSPF on an ASBR located
>within a stub/not-so-stub area? And if not is it possible to do this with
>NSSA?
>
>Also, are there different variants on how distribution can be done, such as
>using network statements on OSPF area routers instead of redistribution
>commands?
>
>Strictly talking about static routes only.
>
>thanks
>**Please read:http://www.groupstudy.com/list/posting.html
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