>"Deloso, Elmer G." wrote:
> > When comparing Distance Vector with Link State protocols, although the
> > procedures are different,
> > isn't the end result for both the same? That is, having a complete map
> > of the entire network?
> > Please correct me if I'm missing something. Thanks.
It's a good question that I'd like to see some gurus discuss.
I think people lose sight of the fact that the end result is quite similar.
The end result is a Routing Information Base (RIB) that specifies reachable
networks, administrative distance to each network, measured distance
(metric) to the network, next hop, outgoing interface, and how long it's
been since we last heard confirmation that this data is still valid. Do a
"show ip route" and you'll see similar information, regardless of whether
you're running RIP, EIGRP, OSPF, etc.
The differences between distance vector and link-state have to do with how
the RIB gets populated. These differences are based on what data is sent to
broadcast/multicast addresses and neighbors, and how the received data is
analyzed and placed into the RIB.
The data that ends up in a RIB also depends on such routing protocol
features as:
* metric: how does the protocol decide between multiple paths?
* load balancing: should the protocol remember more than one path?
* does the protocol support route summarization?
* does the protocol support areas?
* should intra-area routes be preferred over inter-area routes, such as in
OSPF?
* are routes being filtered?
* ETC.
The real answer is, read Howard's book on routing and switching! ;-)
Priscilla
> >
> > Elmer Deloso
>
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