So what are some of the benefits or advantages of a link-state
routing protocols?
Well firstly faster convergence, changes are reported immediately and link-state routing protocols tend
to converge a lot quicker than distance vector routing protocols such as RIP.
Now that said EIGRP which is an enhanced distance vector routing protocol does also converge very
quickly.
It has the simplicity of configuration of a distance-vector routing protocol but does have many of the
advantages of a link state routing protocol. Link state routing protocols are also more robust as the
routers
know the full topology of the network or area they just tend to be less susceptible to routing loops
because of the greater visibility of the network.
Rajahs know the topology and can thus work out the best route to every destination link state packets
are also sequenced and acknowledged within always P.F..
So if an update is not received by a router it will be retransmitted REPP it doesn't form neighbor relationships
or peer relationships but OSPF does.
So if one Rodda sends an update to a peer and one that doesn't acknowledge receipt of the writing update
the ratable retransmit the update.
The Hauraki old design of OSPF and other links state running protocols optimizes resources.
It allows for smaller writing tables because of address summarization and fewer shortest path.
First of calculations because of address hiding essentially if the network is designed properly some
routers will have very small writing tables compared to others and will do for few calculations.
Rod is an area one for example will not be a way of all the routes in area to area 3 because of the
use of summarization on the area border routers and the configuration of spatial areas such as stub
areas the Rockhill design also allows a link state running protocols to scale and thus work in much
larger environments than distance vector writing protocols could large ISP on the Internet for example
may run OSPF or ISIS internally within their autonomous systems OSPF and ISIS are preferred to writing
protocols such as REPP because there are a lot more scaleable link state writing protocols.
However Orsa have group X or disadvantages.
The first disadvantage is that they have a greater demand for resources.
They end distance vector writing protocols do link state routing protocols require more memory.
The routers have multiple tables.
So for example they'll have appear table or neighbor table.
They'll have a typology table or link state database musical in Ellis D-B database and they have a writing
table.
More memory is required to hold multiple tables than would be necessary with a distance vector writing
protocol.
There's also more demand on the CPQ of the rod or a switch when running OSPF or ISIS the dextrous algorithm
can be very process intensive especially when there are a lot of changes in the topology linked state
writing protocols.
Also require strict design's in OSPF as an example.
Area 0 is always required when you have more than one area.
All other areas have to touch the backbone area for areas zero all traffic from one area to another
area has to traverse the backbone area.
The configuration of OSPF is far more complex then distance vector writing protocols such as rep.
However the advantages of link state routing protocols generally far outweigh the disadvantages.
And this is especially true in large environments.
Thus in large typologies OSPF is seen as a much better choice than Rp.