#default routing

Static and Default Routing

Static and Default Routing are two types of routing in which the path selection is controlled manually by a network administrator. STATIC ROUTING “It is a type of fixed routing in which path selection and routing is controlled manually by a network admin”. Static routes have Admin Distance (AD) of 1. Path selection  and routing is manually controlled by a network administrator in static routing.…

Default Routing

Default routing is the routing in which we use the default route and the default route is "when we don't know about the destination prefix and destination prefix subnet mask " so  in that case we use the default routing and forward the user data to the next router that is also known as the forwarding router and the address of that router is forwarding router address. Here below is the topology for understanding the concept of default routing for the accessing of the destination network.

Fig 2: Topology for Understanding Default Routing

In Fig 2: Topology for Understanding Default Routing we have two routers R1 and R2. Both are in same network R1 has 1.1.1.1 ip address and R2 has 1.1.1.2 ip address. So the main point is communicate the two Local Area Networks by the default route means PC1 that is in 192.168.1.0 network should have to communicate with PC2 is in the 192.168.2.0 network.

For the communication between 192.168.1.100 and 192.168.2.100 first we add the default route on R1 for the 192.168.2.0 network and then add the default route on R2 for the 192.168.1.0 network:

R1(config)#ip route 0.0.0.0 0.0.0.0 1.1.1.2

The command to add the Default route is "ip route 0.0.0.0 0.0.0.0 1.1.1.2".

"ip route" is the keyword to add  route.

0.0.0.0 is the network which is known as the prefix network that is the destination network that is unknown that why it is 0.0.0.0

0.0.0.0 is subnet mask of the prefix network that is unknown so that why it is 0.0.0.0

1.1.1.2 is the forwarding router's address and we can use outbound of our router and that command will be "ip route 0.0.0.0 0.0.0.0 s0/0".

s0/0 is the outbound interface which is use to propagate the traffic by the specific interface that you define.

R2(config)#ip route 0.0.0.0 0.0.0.0 1.1.1.1

The command to add the Default route is "ip route 0.0.0.0 0.0.0.0 1.1.1.1".

"ip route" is the keyword to add  route.

0.0.0.0 is the network which is known as the prefix network that is the destination network that is unknown that why it is 0.0.0.0

0.0.0.0 is subnet mask of the prefix network that is unknown so that why it is 0.0.0.0

1.1.1.1 is the forwarding router's address and we can use outbound of our router and that command will be "ip route 0.0.0.0 0.0.0.0 s0/0".

s0/0 is the outbound interface which is use to propagate the traffic by the specific interface that you define.

Static Vs Default routing , 2 way of static routing , configurations, where to use , Lab example.

Difference between Static, Dynamic and Default Routing

Static Routing:

A static routing occurs when you manually add routes in each Router’s Routing table, Routing table should create, maintain, and update by a network administrator, manually. A static route to every network must be configured on every router for full connectivity. This provides a granular level of control over routing, but quickly becomes impractical on large networks. Routers will not share static routes with each other, thus reducing CPU/RAM overhead and saving bandwidth. However, static routing is not fault-tolerant, as any change to the routing infrastructure (such as a link going down, or a new network added) requires manual intervention. Routers operating in a purely static environment cannot seamlessly choose a better Route if a link becomes unavailable. Static routes have an Administrative Distance (AD) of 1, and thus are always preferred over dynamic routes, unless the default AD is changed. A static route with an adjusted AD is called a floating static route. Command Syntax for Static Routing on Cisco Router