Passing the BSCI examination and earning your CCNP certification demands that you insert drastically to the networking expertise basis you made when you analyzed for your CCNA certification. You figured out pretty a little bit about static routing and default static routing when you passed the CCNA exam, and it does seem to be like that need to be all you need to know about static routing, appropriate?
One particular thing you will learn as you proceed to receive Cisco certifications is that you will find often a thing else to study! You may have read the expression “floating static route”, which does propose some intriguing mental pictures. “Floating”? Floating on what?
In a way, a floating static route is “floating” in your routing table. A floating static route is a route that will be applied only if routes for the very same place but with a lessen administrative length are taken off from the desk. For illustration, you could be employing an OSPF-found out route as your primary route to a presented place, and the floating static route would provide as a backup route that would be made use of only if the OSPF route leaves the routing table.
Now, how can that materialize? Right after all, OSPF has an administrative length of 110 and static routes have Adverts of just one or zero, depending on whether or not it truly is configured with a subsequent-hop IP tackle or a area exit interface. 1 way or the other, 1 and are even now less than 110!
When you want to configure a floating static route, you should assign the route an Advert increased than that of the principal route. In this situation, we’ve obtained to create a static route with an Advertisement higher than 110. We do this by employing the “distance” choice at the end of the “ip route” command.
R1(config)#ip route 110.1.1. 255.255.255. 220.127.116.11 ?
Length metric for this route
identify Specify name of the following hop
long term lasting route
tag Set tag for this route
R1(config)#ip route 110.1.1. 255.255.255. 18.104.22.168 111
The range entered at the really conclusion of the “ip route” command is the Advert of that route. If there is an OSPF route for 110.1.1. /24, that will be the major route, and the floating static route will not be utilized until the OSPF route is taken out of the routing table.
Floating static routes aren’t just a good factor to know for the BSCI examination and your CCNP certification pursuit – they’re very practical in the authentic entire world as well.