From: Casey, Paul (6822) (Paul.Casey@o2.com)
Date: Fri Nov 28 2003 - 20:22:06 GMT-3
Brian,
What are the possible reachability issues here.
Can you give an example. how without the /32 it would not function
correctly. I always,when shown an example understand much clearer, as I
assume most people do.
Kind regards.
Paul.
> -----Original Message-----
> From: Brian Dennis [SMTP:bdennis@internetworkexpert.com]
> Sent: Friday, November 28, 2003 10:38 PM
> 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
>
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