Vikas:

    I am not familiar with ospf code in BSD. I guess they want to keep track
of the reachability of ABRs and ASBRs for calculating inter-area and
inter-AS routes. They may keep some "fake" routing tables for ASBRs and ABRs
for this purpose. These routing tables may not be used for forwarding
packets. If my assumption is correct, they use ABR, ASBR or Transit Networks
to decide to which table they will insert the entry. If so, Transit Network
there simply means all other prefixes than ASBR or ABR. Again, the above
explanation is just my guess. Hopefully, someone who knows ospf in BSD will
give a better explanation.

Feng Xie

-----Original Message-----
From: Vikas B. Wadhwani [mailto:wvikasyahoo.com]
Sent: Tuesday, July 17, 2001 2:48 PM
To: feng.xiemarconi.com
Subject: Re: Topology Info

Feng,
Thanks for the response. I am aware that the packets
are delivered to an interface rather than to the
router id. I am looking at the free bsd code. In there
after having found the route to a destination, when
they have to make an entry into the routing
table,there are functions to make entries into the
routing table based on whether the node is an ABR,ASBR
or a transit network. This set me wondering as to what
my node type really is since they are connected by PPP
links and are also hosts(source and sinks for
packets). Im still trying to figure out.What do you
think.
Thanks,
-Vikas

--- "Xie, Feng" <Feng.XieMARCONI.COM> wrote:
> Hi, Vikas:
>
> Usually, only prefixes instead of nodes show in
> the routing table. In the
> case you described, the prefixes could be the ip
> addresses of router
> interfaces or the subnts the router interfaces
> belong to. Packets are
> delivered to interfaces instead of router ids.
> The route type in the routing table could be
> unicast or multicast instead
> of ABR, ASBR and Transit Network.
>
> Feng Xie
>
> -----Original Message-----
> From: Vikas B. Wadhwani [mailto:wvikasYAHOO.COM]
> Sent: Monday, July 16, 2001 8:39 PM
> To: OSPFDISCUSS.MICROSOFT.COM
> Subject: Topology Info
>
>
> Hi all,
> I had a question about a particular topology.
> I want to create a network with a bunch of routers,
> say 50.I want to configure the whole network as ONE
> and only ONE area.In addition to forwarding packets,
> the routers are also a source and sink for
> packets.They are connected in the form of a
> semi-mesh
> network by point to point links.
> Since there is only one area, there are no ABRs and
> ASBRs.
> When the routing table is being created, what is the
> TYPE of the nodes? In the routing table we need to
> mention the Destination Type.The options available
> are
> ABR,ASBR and Transit Network.Now the routers are
> neither ABR nor ASBR. They are also not transit
> networks becasue they are not connected to any
> network. How should each node be configured and what
> will the routing table entries look like?
> Thanks,
> -Vikas
>
> =====
>
>
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