Answer Posted / jitendera

folks
just jumping in yours conversation. i have seen Lots of
answers for this question some one told static.some one told
rip and soo on

let me ask one thing is the is Ad value have the priority
to select the route from routing table.

ok i think lots of from you is not able to understand what i
am asking. Allow me to give one example
i have one router Say R1.one R1 i have the route
configuration like

R1( config )# ip route 192.168.1.0 255.255.255.0 fa0/1

R1( config )# router eigrp 109
R1( config-router )# network 192.168.1.0
R1( config )# no auto summry


R1( config )# route ospf 10
R1( config )# network 192.168.1.0 0.0.0.255 area 0

now tell me which path will router take

i know all of them will say static as it have low Ad value
.and it is right

now one the same router i have configured

R1( config )# ip route 192.168.1.0 255.255.255.0 fa0/1

R1( config )# router eigrp 109
R1( config-router )# network 192.168.1.0 0.0.0.127
R1( config )# no auto summry


R1( config )# route ospf 10
R1( config )# network 192.168.1.0 0.0.0.255 area 0


now tell me which route the router take. If again you will
say static then you are wrong.

now it will take Eigrp (;-) ) strange....ok let me expalain

the router will not take any decision on the behalf of ad
value the router will take the route from routing table
which have maximum mask. here eigrp has /25 so it will take
eigrp. get it?

ok

now if some one ask what is the best protocol then you have
to answer it depend on the ORG structure if they have less
the 1 to router in the network the static is good then up to
15 router Rip V1 and V2 is good. But if some one told that i
have more then 100 routers in my network and i have only
cisco devises then i will go Eigrp.ospf is if any only if
they have different vendors routers too.

but if some one ask what is the best routing protcol you
have to say eigrp.

why? due to it DUAL Algo

now what is DUAL algo---refer the book

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