>

Zhang

>
> >
> > N1 is represented by DR, SPF sees only node and p2p
> > adjacency so what do
> > you mean by "the parent of R3 is not R2, is N1 "
>
> >From the rfc, spf sees only the router-lsa and
> network-lsa,which router-lsa represents the links of
> router and network-lsa represents the links of
> network.
>

I'm saying that R1 announce a link to DR ( link ID = DR IP address )
which in fact represents N1
if you like, in other words R1 announce a link to the network N1 ( again
represented by DR ) But my point was if N1 = 192.168.1.0 / 24 with DR (
192.168.1.1 ) then the IP subnet is meaning less for SPT and it consider
a link to 192.168.1.1 which is DR

>
> > N1 is just an IP address that does not exist while
> > we built SPT
>
> N1 is represents by the network-lsa,which is generated
> by the DR.
>

see above I meant the IP subnet address, of corse N1 is represented by DR

>
> > also R1 does not have a direct adjacency to R3 but
> > it announce a link type
> > 2 ( transit ) to the DR and the DR announce a link
> > to all the attached
> > routers.
>
> DR announce a network lsa, whick includes many links
> of network, not a link.
>

 I meant by " a link to all the attached routers" >>> it announce a link
back from DR to every attached router or if you like many link
( with many = link to every attached ;-)

Sina

>
> Regards,
> zhang
>
> > so in the directed graph R1 should go through DR in
> > order to reach R3 so
> > the parent of R3 is DR ( R2 )
> >
> > Sina
> >
> >
> >
> >
> > >
> > >
> > > Jina.
>
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