From: netchild ccie (netchildccie@hotmail.com)
Date: Wed May 21 2003 - 23:02:07 GMT-3
Hi Brian,
Thanx for answering the second question. About the first question, I didn't
need to pick a book or read the RFC, I used my mind and I figure it out. I
was stupid to ask that question ;) OSPF does not need split-horizen since it
is link-state protocol and no meaning to use split-horizen !!!!
Back to the second question, in this case I don't need map statement. In the
CCIE Lab exam do I have to write the map statement or not since it is not
necessary for ospf or I will lose some point in frame relay section ?
thanx
NetChild,
>From: "Brian Dennis" <brian@labforge.com>
>Reply-To: "Brian Dennis" <brian@labforge.com>
>To: "'netchild ccie'" <netchildccie@hotmail.com>, <ccielab@groupstudy.com>
>Subject: RE: ospf point-to-multipoint Date: Wed, 21 May 2003 16:24:32 -0700
>
>I'll skip the first question and let you figure that one out ;-) I would
>highly recommend you pick up a book or read the RFC on OSPF.
>
>As far as the second one is concerned it's because the RFC said so ;-)
>
><RFC2328>
> 12.4.1.4. Describing Point-to-MultiPoint interfaces
>
> 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.
></RFC2328>
>
>The reason is to ensure that every spoke can reach every other spoke.
>This is needed for a physical or multipoint subinterface that does not
>have mappings from spoke to spoke. A point-to-point subinterface does
>not need the /32 route.
>
>Brian Dennis, CCIE #2210 (R&S/ISP-Dial/Security)
>
>-----Original Message-----
>From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
>netchild ccie
>Sent: Wednesday, May 21, 2003 3:00 PM
>To: ccielab@groupstudy.com
>Subject: ospf point-to-multipoint
>
>Dear Group,
>
>I have three routers connected as hub-spoke topology. I'm runing ospf on
>
>frame relay as multipoint interface on the hub router and normal
>physical
>interface on the spoke routers.
>
>I configured ospf as point-to-multipoint network. I have two questions
>regarding this setup.
>
>(1) Why I don't need to disable split-horizen on the hub serial
>interface ?
>I need to do that when I configured RIP or EIGRP for the same setup.
>
>(2) What is the use of /32 route that ospf inject to the route-table
>when I
>use point-to-multipoint network since the next-hop is the IP address of
>the
>hub router.
>
>Regards,
>NetChild,
>
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