RIP concept

hassantalal785

When talking of Distance-vector protocol , we know of 3 mechanism that would prevent loop backs.
a)Split Horizon
b)Route Poisoning
c)Poison Reverse

I know the details of the above mentioned mechanism but what i don't understand is that by default which of the above mentioned is used by RIP in Cisco routers ? I think that split horizon with route poisoning and split horizon with poison reverse are also 2 mechanisms to avoid loop backs.

elderkai

Split Horizon is always enabled on the interfaces by default. I don't think you necessarily enable or disable route poisoning or poison reverse. That or you just wouldn't have a reason to, unlike with split horizon where there are some scenarios where you would.

hassantalal785

Is split horizon alone is set by default or split horizon alone doesn't exist and is used either as split horizon with route poisoning or split horizon with poison reverse ?

NetworkVeteran

All of these (split horizon, route poisoning, poison reverse) are unique features.

http://en.wikipedia.org/wiki/Route_poisoning
http://en.wikipedia.org/wiki/Split_horizon_route_advertisement#Poison_reverse

By default, Cisco..

If you want to master RIP, I suggest labbing it to find out.