Hi all,
  Sina, thanx for your suggestion. With P2P
interface, can you have more than one neighbor? This
means there will be 3 routers in the network. I did
say the network will ever have most 2 routers, but I
want to make sure there is a backup plan to support
additional routers without reconfiguring both existing
routers. From RFC2328, I could not find restriction
that P2P interface can only have at most 1 neighbor.

> you will carry extra /32 routes by configuring p2p

  Where does the extra 32 routes with P2P
configuration come from?

  It seems obvious to me to use "broadcast" interface
type for Ethernet medium. But if I know the network
will ever going to have only 2 and some at most 3
routers. I'm not sure if broadcast is the way to go
versus P2P. Is there other benefits (other than
DR/BDR, type 2 LSA elimination) for using P2P type
versus broadcast in a confined broadcast network?

thanx in advance,
Michael

--- Sina Mirtorabi <sinaCISCO.COM> wrote:
> Michael
>
> Michael Yeung wrote:
>
> > Hi all,
> > The following is quoted from RFC2328:
> >
> > "Each broadcast and NBMA network that has at least
> two
> > attached routers has a Designated Router"
> >
>
> This is because if only one router is attached to a
> multi-acess netwrok
> ( broadcast or NBMA ) the netwrok is considered as
> stub and you won't
> have DR / BDR
> on the other hand 2 router never know in advance
> how many routers will
> be joining the netwrok so as soon as you have 2
> router we run the DR /
> BDR election
>
>
> >
> > I was wonder if it is worth the trouble of using
> DR
> > and BDR in a broadcast environment where there
> will
> > ever only be 2 possible routers.
> >
> > Given the RFC does not impose restriction on
> using
> > "broadcast" type for broadcast medium. I can
> easily
> > configure the interface as "point-to-multipoint"
> type.
> > Does anyone see a problem of doing this
> (remember,
> > there are only 2 possible routers therefore
> routing
> > traffic should not be an implication)?
> >
> > Personally I see benefit of using
> > point-to-multipoint configuration if the network
> is
> > only ever going to deal with 2 routers. Just
> because
> > the process of DR and BDR election is eliminated
> and
> > the process of database synchronization with DR is
> > eliminated.
> >
> > Please give you your opinion and insight.
> >
>
> why you want to use point-to-multipoint for only 2
> routers and not
> point-2-point, you will carry extra /32 routes
> by configuring p2p your database size will be
> reduced as there would be
> no type 2 LSA and no DR/BDR election
>
>
> Sina
>
> >
> > thanx in advance,
> > Michael
> >
> > __________________________________________________
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