Why isn't BGP a distance vector protocol?
Isn't the definition of a distance vector protocol in short- a routing
protocol that determines the distance to all destinations from itself using
information received from it's neighbors?
Well the big difference I can see with BGP is that it uses a different way
of figuring the distance- being AS's in it's path instead of hops or cost.
If that were the thing that made it different, IPX RIP and DECnet Phase 3
wouldn't be distance vector protocols either, since they don't just use
"hops" as IP RIP does. The reason I bring this up is that I have heard it
called a path vector protocol. It just seems like marketing hype since
Distance Vector protocols seem to have a bad connotation for the reason it
is referred to as a path vector protocol. What would you call IPX RIP then
since it uses hops and cost.
DECnet phase 3 uses incremental updates.
>>>Brian
>From: "Howard C. Berkowitz" <[EMAIL PROTECTED]>
>Reply-To: "Howard C. Berkowitz" <[EMAIL PROTECTED]>
>To: [EMAIL PROTECTED]
>Subject: Re: Hybrid Routing Protocol
>Date: Thu, 1 Feb 2001 14:07:30 -0500
>
> >The only DV protocol that sends incremental updates? You sure about that?
>
>For IP interior routing on Cisco, yes. If one wants to argue BGP is a
>DV derivative, it sends incremental updates.
>
>Other DV incremental update protocols are described in routing
>research literature, but they are not widely deployed.
>
> >
> >>>>Brian
> >
> >
> >>From: John Neiberger <[EMAIL PROTECTED]>
> >>Reply-To: John Neiberger <[EMAIL PROTECTED]>
> >>To: Jason Wong <[EMAIL PROTECTED]>, [EMAIL PROTECTED]
> >>Subject: Re: Hybrid Routing Protocol
> >>Date: Thu, 1 Feb 2001 10:20:42 -0800 (PST)
> >>
> >>Well, it certainly is called a hybrid, but that's marketing hype; it's
> >>operation is completely DV in nature. It's "hybrid" characteristic is
>that
> >>it only sends incremental updates and it establishes neighbor
> >>relationships,
> >>which other DV protocols do not do.
> >>
> >>That does not, however, change its basic nature, which is distance
>vector.
> >>
> >> > Actually EIGRP is a hybrid protocol. I believe it is the ONLY
>example
> >>of
> >>one, in fact.
> >> >
> >> > JW
> >> >
> >> > ------------
> >> > A DV protocol, like RIP or EIGRP, send their entire routing table
>to
> >>their
> >> > directly attached neighbors and then receive their neighbors
>routing
> >>tables
> >> > in return. That's an important point: they send the *entire*
>routing
> >>table,
> >> > not just the routes they know about first hand.
> >> >
> >>
> >>
> >>
> >>
> >>
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