Tuesday, 18 September 2012

Ospf in detail


Terms in the OSPF

Area        Each AS no. divided into smaller parts and each such part is known as an area

Area 0         The main area or the backbone area that manages the overall process of communication is called area 0.

ABR (Area Border Router)        It allows two diff. area routers to communication with each other with in the same AS no.

ASBR (Autonomous System Border Router)
        It allows two different autonomous system routers to communication with each other
Basic terminology

Link:      It represents an interconnection between two devices or an interface whose status can be either up or down

Router ID:    It is a metric in terms of highest IP address S0 router with the highest IP address or router ID will be elected as designated router (DR)

Neighbor:        Router which are adjacent to each other are said to be neighbors.

Adjacency:        Router which are immediate neighbor to each others are said to be adjacent

Hello packet:         It is only through exchange of hello packet two router will become neighbor to each other

Link state advertisement:        It contains information regarding the status of the link and the route update


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