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IP Routing


IP Routing

IP routing is basically the process of moving packets from one network to another network using routers.

Routing protocols

Router use routing protocol to dynamically find all the networks within the great internetwork and to ensure that all router have the same routing table, routing protocols are also employed to determine the best path a packet should through an internetwork to get its destination most effectively. RIP, RIPv2, OSPF, and EIGRP are the most common routing protocols.

Routed protocols

Routed protocols can be used to send user data (packets) through the established enterprise. Routed protocols are assigned to an interface and determine the method of packet delivery. E.g. IP and IPv6.

The three type of routing method.

Ø Static routing

Ø Default routing

Ø Dynamic routing

Static Routing

Static routing is the process that ensure when you manually add routes in each router’s routing table. There are the advantages and disadvantages of Static Routing.

Here the advantages:

· There is no overhead on the router CPU.

· There is no bandwidth usage between routers.

· It adds security because of you, the administrator, can be very exclusive and choose to allow routing access to certain networks only.

And here are the disadvantages:

· The administrator is must have a vault-tight knowledge of the internetwork and how each router is connected in order to configure routes correctly. If you don’t have a good, accurate map of your internetwork, things will get very messy.

· If you add a network to the internetwork, you have to tediously add a route to it on all routers by hand.

· It’s just not feasible to use it in most large networks because maintaining it would be a full-time job in itself.

Here’s the command syntax you use to add a static route to a routing table from global

ip route [destination network] [mask] [next-hop address or exit interface­] [administrative distance] [permanent]

ip route- the command used to change the static route.

Destination network- the network you’re placing in the routing table

Mask- the subnet mask being used on the network

Next-hop address- this is ip address o the next-hop router that will receive packets and forward them to the remote network.

Exit interface- used in place o the next-hop address if you want, and show up as a directly connected route.

Administrative- distance by default, static routes have an administrative distance o 1 or 0. Next-hop AD is 1, and exit interface AD is 0.

Permanent- if the interface is shut down or the router can’t communicate to the next-hop router, the route will automatically discarded from the routing table by default. Choosing the permanent option keeps the entry in the routing table no matter what happens.

Static routing config:IP Routing


1 Comment

Edgar, good post +5. I think you need to mention in your opening line that routing is not just moving packets from one network to the other, but imporantly that this happens on layer 3 of the OSI model. as opposed to for instance switches that move frames from one network to the other, using ethernet (layer2). 

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