Re: Difference between Distance vs Link state protocol

EIGRP actually is a distance vector protocol, even though it sometimes is
called fancy names like "advanced distance vector" or "hybrid." It's
distance vector, just based on the DUAL algorithm as opposed to
Bellman-Ford.

In addition that what has already been pointed out, one key difference
between link-state and distance vector is the way that they treat topology
information. Link-state determines the best path to a destination by
looking at the actual topology information. Every router in the same
flooding domain advertises or floods information about the state of its
links, then a common view of the network is built based on this information,
algorithm is run to determine the best path, etc.

Distance vector determines the best path to a destination by looking at the
reachability information (not topology information) that it receives from
its peers. The actual network topology doesn't come into consideration when
determining the best path, but rather the metric advertised by each
neighbor.

So in summary, distance vector hides topology information at each hop, and
link-state hides topology information at the edge of the flooding domain.
This is important to know when you're dealing with routing design... That's
what Russ would say, and since I'm pursuing the CCDE, I'm sticking to it!
Ronnie
On Thu, Jul 21, 2011 at 3:33 AM, Rajesh Prasad
<prasadrajesh1979_at_gmail.com>wrote:

> Hi All,
>
> What's the major difference Link state Vs distance vector protocol. How
> eigrp is differ from Distance vector protocol?
>
> I know
> 1) Distance vector send periodic update of entire routing table in RIP 30
> Sec, IGRP 90 Seconds. However OSPF send updated whenever any changes in
> routing table and send entire routing table in every 30 Mins.
>
> 2) Distance Vector totally relay on neighbour and it install the routes in
> its routing table whatever send by neigbor and don't know about the source
> of the route. However, link state protocol used its own mechanism to link
> SPF in ospf to calculate the shortest path for destination but it is area
> only. For summary routes and type 5 LSA it is act as distance vector
> protocol.
>
> Is there any major difference between these two?
>
> Rgds,
>
>
> Rajesh Prasad
>
>
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-- 
Ronald Angello
Senior Network Architect
CCIE 17846
CCDP, CCIP, CCNP
Blogs and organic groups at http://www.ccie.net