Re: ospf point-to-multipoint networks and the /32 route

From: Peter Van Oene (pvo@xxxxxxxxxxxx)
Date: Mon Jan 08 2001 - 17:46:54 GMT-3


   
Hi Julie,

You are actually observing the correct behavior for OSPF point to multipoint in
terfaces. Here is a quick excerpt from 2328

        For operational Point-to-MultiPoint interfaces, one or
                more link descriptions are added to the router-LSA as
                follows:

                o A single Type 3 link (stub network) is added with
                    Link ID set to the router's own IP interface
                    address, Link Data set to the mask 0xffffffff
                    (indicating a host route), and cost set to 0.

                o For each fully adjacent neighbor associated with the
                    interface, add an additional Type 1 link (point-to-
                    point) with Link ID set to the Router ID of the
                    neighboring router, Link Data set to the IP
                    interface address and cost equal to the interface's
                    configured output cost.

Hope that helps

Pete

*********** REPLY SEPARATOR ***********

On 12/27/2000 at 3:01 PM Connary, Julie Ann wrote:

>Hi all,
>
>how do you get ospf to not advertise a /32 network for a
>point-to-multipoint network. In the
>ospf database on another router when I issue "show ip ospf database router"
>I see the following:
>
>Link connected to: a Stub Network
> (Link ID) Network/subnet number: 150.100.32.2
> (Link Data) Network Mask: 255.255.255.255
> Number of TOS metrics: 0
> TOS 0 Metrics: 0
>
>Why does ospf see the point-to-multipoint frame-relay network as a stub?
>
>Thanks in advance,
>
>Julie Ann
>------------------------------------------------------------------------
> Julie Ann Connary
> | | Network Consulting Engineer
> ||| ||| Federal Support Program
> .|||||. .|||||. 13635 Dulles Technology Drive,
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