route

How to configure On-Demand Routing in Cisco routers?

On-Demand Routing (ODR) is one of the few simple routing methods. It is not a protocol by itself as it uses Cisco Discovery Protocol (CDP) to gather and propagate the route information. ODR is designed for Hub-spoke networks, where the spokes are stub networks with nothing connecting them. As...

How to Interconnect OSPF areas? – part 2

In my previous entry, I have mentioned the methods that can be used to interconnect different areas in OSPF. In this entry, I would post another similar network...

How to Interconnect OSPF areas? – part 1

While studying for CCIE, i realized that no scenario will be without connecting different OSPF areas. So, what are the rules when having multiple areas in OSPF to have a fully converged network with full route propagation? The rule is one

Every Area is OSPF should be connected to...

how to use Administrative distance?

When i started writing the first article, i never thought that it will turn into a three different blogs. Truth to be told, the scenario was such a complicated one. that just changing the AD was not enough to provide the intended routing path.

The scenario is from the...

how to use Administrative distance? – part 3

This is the last entry for the series "how to use administrative distance". The interesting part was, why when static routes were distributed into EIGRP, they were shown as Internal?

how to use Administrative distance? – part 2

In my earlier Blog, i have shown a detailed diagram of the problem/ requirement of the network change. After 5 mins of studying the proposal i came with an easy solution to change the routing behavior. I have made few assumptions and based on it i built my design. These assumptions are correct,...

Different methods to advertise routes into OSPF

Advertising routes into protocols is one of the interesting topics. Most of big enterprise networks will have different routing domains. Thus dealing with these routes become an essential topic in CCIE exams. Although the topic stats into OSPF, but these methods can generally be applied into any...

How to configure route dampening in BGP

Flapping routes are bad news in BGP. flapping routes are the routes that go up and down in very short time. they are bad news cause they require changes in routing table. routing table that consists of 100 thousand routes cause high load on router. a flapping route will: 1- change the table by...

How to add reliable default route with RIP?

Adding reliable default route with RIP The command for distributing a default route into RIP process is very straight forward.  Lets go with the syntax straight away.

router rip default-information originate route-map RELIABLE ! route-map...

How to filter routes in RIP?

Filtering routes in RIP Although rip is not the best routing protocols, the mechanism of filtering routes can be applied to other routing protocols a well. My personal advice will be to stay away as much as possible from RIP. RIP is a routing loop magnet, you never know when you...