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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