[c-nsp] Redistributing on OSPF

[Piotr Marecki]

> Hi,
>
> >
> > We are employing OSPF in our Network i.e. 3 locations each of them in
> > 3 different areas and backbone routers on area 0. now we are having a
> > problems in Summarizing E1 type of Routes we have employed the area
> > xx range x.x.x.x x.x.x.x command on the ABR but still we are getting
> > Breakup routes like /28 and /29 along with the summarized /24 or /22
> > routes.
> >
> > Can any one of you help me as to how we should go about in
> > summarizing the E1 Routes.
>
> you can't summarize externel routes anywhere in the OSPF network except
> on the ASBR where you redistribute the routes into OSPF
> (http://www.cisco.com/warp/public/104/1.html#t30).
>
> area xx range <prefix> <mask> does not apply to external OSPF routes.
>
> oli
>

If summarizing routes is top priority there is always possibility to change
area type to NSSA , where
ABR can summarize/filter during LSA7 to LSA5 translation .Of course not
always NSSA is viable solution ,
all depends on actual topology and network design.

regards

Piotr Marecki