What is Dynamic Routing?
Dynamic Routing is defined as networking technique which provides data routing that is optimal. Dynamic routing enables the routers to choose the paths as per the real-time logical changes of network layout, unlike static routing. However, in dynamic routing, the routing protocol that operates on the router is responsible for the creation, maintenance as well as updating of the table of dynamic routing. All of these jobs are manually done by the system administrator in static routing though. It makes use of many algorithms and protocols. However, the most popular one are Routing Information Protocol, that is, RIP and Open Shortest Path First, that is, OSPF.
What Can You Do With Dynamic Routing?
Dynamic routing protocol working is explained as under :
- Router first delivers and then receives routing messages over the router interface.
- Dynamic Router messages also share the information with different routers, that make use of the very same protocol.
- Routers would then swap their routing information in order to discover the data regarding remote networks.
- When so ever the router finds a change in the topology, routing protocol advertises that particular topology change to all other routers.
Dynamic routing is considered easy to configure on large networks and also it is more intuitive than static routing at a selection of the best route, detection of the route changes and also a discovery of the remote networks.
But, since the routers always share updates, they always consume bandwidth more than it consumes in static routing. The routers CPUs, as well as RAM, also face loads which are added as a result of protocols of routing. At last, dynamic routing is considered to be less secure than static routing.
Advantages of Dynamic Routing
- Dynamic Routing involves more of automation in the way that routing gets automatically sent to all of the other routers.
- Dynamic Routing also involves a change of notification, in the way that, the dynamic routing protocol has got the ability to reroute the traffic around link which is congested.
- Dynamic Routing involves higher uptime for the users since the routing protocol has got intelligence and it can also react much faster therefore, users are able to see higher uptime.
- Dynamic Routing also deals with greater throughput of the network since the routing protocol has the ability to calculate the most responsive network link to make use of, also users see less of latency and more of performance in the network.
- Dynamic Routing involves much less of work for administrators, as and when the network grows, the administrator need not worry regarding the configuration of other routers on a network. Rather, the administrator would configure the dynamic routing protocol on a new router so as to talk to those routers and make them aware of networks which the new router will offer.
Dynamic Routing Protocols
There exist many interior gateway routing protocols, that is, IGP. These are the protocols that could be used within the network. These protocols are supported by every router and operating system of the server like Windows 2003 Server or Linux too. Some of the protocols are explained as under :
1. OSPF (Open Shortest Path First):
It is a very famous dynamic routing protocol that is being used in today’s world. OSPF is also an open protocol to ensure that any router or even server operating system is able to run this protocol. It selects the best route by making use of cost as its metric. It is also considered as a complete featured routing protocol and also it can be complex, however, it can also scale to any size in the network.
2. EIGRP (Enhanced Interior Gateway Routing Protocol):
It is considered as a proprietary protocol of Cisco. Just for your information, just the Cisco devices make use of EIGRP. It is a completed-featured protocol just like OSPF. It has got some amazing features, but until you make sure that you are going to have a Cisco network, the use of open protocol (OSPF) is recommended. EIGRP has replaced IGRP which was its predecessor. The metric that is needed to select the best route through EIGRP is calculated by the use of a formula that takes into account bandwidth, reliability, delay of the link and also load.
3. RIP (Routing Information Protocol):
RIP is considered a protocol that is an open source. Version 2 of it is the latest one that you should be using today since it provides VLSM, that is, Variable Length Subnet Mask support. It is simplest as well as the easiest protocol of routing to configure, although it also has got lesser features as compared to OSPF. It is restricted to routing for the network having less than 15 hops. This protocol works quite well for a small network that doesn’t think of expanding largely. Another great feature about it is that it is generally supported by the smallest routers and also the firewalls.
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4. BGP (Border Gateway Protocol):
BGP is considered as the routing protocol of the Internet. It is also Exterior Gateway Protocol, that is, EGP which means that BGP is used by routers making decisions of routing on the Internet. If your home has got a connection to the Internet then you don’t really need BGP or even need to run it. In case the router has got more than one dedicated connection to, you might require running. It is a path-vector protocol which implies that it can select the best route as compared to other routing protocols. BGP makes use of the “AS-PATH” as the routing metric and also it selects the route which has got the shortest path through the entire Internet.
Thus, we can conclude that the routing protocols are just a set of languages that router makes use of to communicate the routing information along with other routers. The main benefit of using routing protocol is its ability to get adapted to changing the network topology.
This has been a guide to Dynamic Routing. Here we discussed the concepts, advantages and what we can do with dynamic routing. You can also go through our other suggested articles to learn more –