From: Kristian Bjoernskov (krbj-ccie@xxxxxxx)
Date: Mon Sep 25 2000 - 06:12:05 GMT-3
On Sat, 23 Sep 2000, Atif Awan wrote:
>
> When i configure RIP for sending unicast updates it also advertises a route
> for the subnet on the interface on which it is sending the updates. For
> example, suppose my serial 0 interface has an ip address 0f 10.3.0.2/24 rip
> is configured to unicast the updates to 10.3.0.1 using the neighbor command.
> When i see the output of the command debug ip rip it displays:
>
> RIP: sending v1 update to 10.3.0.1 via Serial0 (10.3.0.2)
> subnet 10.3.0.0, metric 1
>
> in addition to other routes.
>
> Can someone please explain why the router needs to advertise the directly
> connected subnet in its updates.
Well, maybe it doesn't! It is however required by RFC1158 #2 to advitice
the entire route table which include directly connected networks.
If your network was not a Serial but maybe an ethernet or tokenring, more
than one IP subnet could appear on each physical net. If not all hosts
without default gw (ie running routed) and all routers is aware of all
nets, the router(s) will need to route between different subnet on the
same physical net.
Most kind regards,
Kristian Bjoernskov, <mailto:krbj@novo.dk>
Novo Nordisk IT, Network - internet.
Phone: +45 4442 3299. Fax: +45 4442 6061
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