From: Brian Dennis (bdennis@internetworkexpert.com)
Date: Fri Nov 28 2003 - 20:48:20 GMT-3
You would summarize on all area 2 ABRs. In your case R1, R2, and R3 are
ABRs for area 2.
Brian Dennis, CCIE #2210 (R&S/ISP-Dial/Security)
bdennis@internetworkexpert.com
Toll Free: 877-224-8987
Direct: 775-745-6404 (Outside the US and Canada)
Internetwork Expert, Inc.
http://www.InternetworkExpert.com
-----Original Message-----
From: navaid@rogers.com [mailto:navaid@rogers.com]
Sent: Friday, November 28, 2003 2:53 PM
To: Brian Dennis; ccielab@groupstudy.com
Subject: Re: RE: ospf network point-to-multipoint
Brian,
Thanks for reply. I liked area range option to summarize host routes.
In my topology:frame network is one area that is area 2.
I also have: R2 (hub) connected to area 0
R1 (spoke) connected to area 1
R3 (spoke) connected to area 3
and virtual links between R1-R2 and R2-R3.
In this case where should I configure area range command ?
Thanks,
Navaid
>
> From: "Brian Dennis" <bdennis@internetworkexpert.com>
> Date: 2003/11/28 Fri PM 05:38:26 EST
> To: <navaid@rogers.com>, <ccielab@groupstudy.com>
> Subject: RE: ospf network point-to-multipoint
>
> Basically just don't run point-to-multipoint ;-)
>
> The behavior of point-to-multipoint is to advertise each end-point out as
a
> /32 and suppress the advertisement of the network itself.
> Point-to-multipoint does this to overcome possible reachability issues
> between devices that are on the same logical subnet but do not have direct
> communication (i.e. spoke to spoke communication). OSPF
point-to-multipoint
> and technically loopback network types do not advertise the network
itself.
> This is as per the RFC.
>
> If you want to suppress the /32s and advertise only the network, you would
> need to use an OSPF network type other than point-to-multipoint or
configure
> the network to be in its own OSPF area. After the network is put in its
own
> OSPF area, use the area range command to summarize the /32s so other
routers
> only see the summarized route.
>
> Brian Dennis, CCIE #2210 (R&S/ISP-Dial/Security)
> bdennis@internetworkexpert.com
> Toll Free: 877-224-8987
> Direct: 775-745-6404 (Outside the US and Canada)
> Internetwork Expert, Inc.
> http://www.InternetworkExpert.com
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> navaid@rogers.com
> Sent: Friday, November 28, 2003 2:13 PM
> To: ccielab@groupstudy.com
> Subject: ospf network point-to-multipoint
>
> I have ospf network point-to-multipoint configured between R1,R2 and R3.
> R2 is frame relay Hub and R1,R3 spoke.
> In my routing table I am seeing host routes (/32) for frame interface of
> R1,R2 and R3 but NO router for subnet. How do I suppress host and see only
> one route for subnet which is /24.
>
> Thanks,
>
> Navaid
>
> _______________________________________________________________________
> Please help support GroupStudy by purchasing your study materials from:
> http://shop.groupstudy.com
>
> Subscription information may be found at:
> http://www.groupstudy.com/list/CCIELab.html
>
>
>
1
This archive was generated by hypermail 2.1.4 : Fri Dec 12 2003 - 12:29:19 GMT-3