Alex,
You say that the type 3 link will give the network
reachability information. What if the router is used
just for forwarding and is not attached to any
network. Will there still be a type 3 link advertised?
Also, in another situation when the router itself is
the host, will there be a type 3 link to it advertised
by the previous router?
Thanks,
-Vikas

--- Alex Zinin <azininNEXSI.COM> wrote:

> Feng, Vikas
>
> Yes, if there's a fully adjacent neighbor on a p2p
> interface,
> the router-LSA will have two links. One (type-1)
> will give
> topological information about the link (or the
> adjacency,
> strictly speaking), the other (type-3) will give
> the network
> reachability information associated with it.
>
> --
> Alex Zinin
>
> Monday, July 02, 2001, 1:22:04 PM, Xie, Feng wrote:
>
> > Hi, Vikas:
>
> > My understanding is that two entries are added
> for a point-to-point link
> > if the adjancency is full. The first entry which
> is a first type link gives
> > the nbr rid and local IP address information. The
> second entry which is a
> > third type link gives the nbr ip address
> information. In fact, for the
> > second entry, some vendors use the network address
> and the mask. A short
> > comparison is given in RFC2328, p181, item 15 for
> thest two options.
>
> > Feng Xie
>
> > -----Original Message-----
> > From: Vikas B. Wadhwani [mailto:wvikasYAHOO.COM]
> > Sent: Monday, July 02, 2001 3:24 PM
> > To: OSPFDISCUSS.MICROSOFT.COM
> > Subject: Link State Advertisments
>
>
> > Hello all,
> > This is from RFC 1583
>
> > Else, if the state of the interface is
> Point-to-Point,
> > then add links according to the following:
>
> > If the neighboring router is fully adjacent, add a
> > Type 1 link (point-to-point) if this is an
> interface
> > to a point-to-point network, or add a Type 4 link
> > (virtual link) if this is a virtual link. The
> Link
> > ID should be set to the Router ID of the
> neighboring
> > router. For virtual links and numbered point-to-
> > point networks, the Link Data should specify the
> IP
> > interface address. For unnumbered point-to-point
> > networks, the Link Data field should specify the
> > interface's MIB-II [RFC 1213] ifIndex value.
>
> > If this is a numbered point-to-point network (i.e,
> > not a virtual link and not an unnumbered point-to-
> > point network) and the neighboring router's IP
> > address is known, add a Type 3 link (stub network)
> > whose Link ID is the neighbor's IP address, whose
> > Link Data is the mask 0xffffffff indicating a host
> > route, and whose cost is the interface's
> configured
> > output cost.
>
>
> > My question is, in case of a numbered point to
> point
> > network, are there 2 links added for a
> neighbouring
> > router? If a router is connected by a PPP link to
> > another, does the above mean that a Type 1 link
> and a
> > Type 3 link will be added to the router's LSA for
> a
> > neighbour?
>
> > Thanks,
> > -Vikas
>
> > =====
>
>
> > __________________________________________________
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