L3 Routing in IP Networks

What is L3 routing?

Routing is a procedure of transmitting a packet on a network from one place to another. The transmission happens with the help of addressing mechanism, IP Addressing. IP address is a 128 bit logical address. It can be bind on different networking devices like routers and L3 switches. The routers transmit the IP packets after finding their routes in the routing table. If the route of a packet does not exist, the packet drops immediately. The distribution of routes in a network can take place by two means:

• Static routing
• Dynamic routing

In static routing, The administrator has to bind all of the IPs on every single device manually. It means any change in network or addressing will result in reconfiguration of all devices.

While in dynamic routing,  routes between the devices exchanges using different protocols. This is more normally the preferred choice of engineers in large and complex networks. List of Dynamic routing protocols is given:

• EIGRP
• OSPF
• ISIS
• BGP