Thursday, 27 October 2011

Routing protocols

1.To understand routing protocol , just understand few terminology.
2.route,router,routed,routable,ad,as,igp,egp,metric.
3.Route:-is the network number(net id),which is carry by router from one network to another.it can be two types:-static and dynamic.
4.Router:-is the device which takes route from one place to another.
5.Routed/Routable:-is the packet contain by IP and which can carry over internet.
6.AD:-is the administrative distance which is used to find the trustworthiness of the route.it is define by the no.from 0-255. in which 0 is the best and 255 is bad.each routing protocol has its ad value.like:-directly connected = 0.static route=1.rip=120,eigrp=90,ospf=110.if all routing protocol is configured then lower no will be available in routing table.
7.AS:-autonomous system is the collection of routing protocol under single administrative domain(single company policy). there are two types of range of as.private and public.public range from 1-64511.private range from 64612-65535.
8.IGP:-is interior gateway protocol which run within the single autonomous system no.(distance vector,link state and hybrid protocol).
9.EGP:-is exterior gateway protocol which run between as like bgp.
10.Metric:-is the mathematical calculation used to find the best path.like:-hop,bandwidth,delay,cost etc.

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