Re: OSPF neighbour and adjacency

May be something to do with Broadcast / non broadcast and point to x Mediums

On Sat, Jan 30, 2010 at 3:46 PM, Faisal Ilyas <faisal.learning_at_gmail.com>wrote:

> Salam,
>
> Adjacencies
>
> The fact that routers are neighbors is not sufficient to guarantee an
> exchange of link-state updates; they must form adjacencies to exchange
> link-state updates. Adjacency is an advanced form of neighborship formed by
> routers that are willing to exchange routing information after negotiating
> parameters of such an exchange. Routers reach a FULL state of adjacency
> when
> they have synchronized views on a link-state database.
>
> Interface type plays a major role in how the adjacencies are formed. For
> example, neighbors on point-to-point links always try to become adjacent,
> while routers attached to broadcast media such as Ethernet can choose to
> become adjacent only with a subset of neighboring routers on the interface.
>
> Once a router decides to form an adjacency with a neighbor, it starts by
> exchanging a full copy of its link-state database. The neighbor, in turn,
> exchanges a full copy of its link-state database with the router. After
> passing through several neighbor states, the routers become fully adjacent.
> Neighbor States
>
> You can use the *show ip ospf neighbor* command to determine the state of
> the OSPF neighbor or neighbors. The output of this command will most likely
> reveal one of these:
>
> -
>
> nothing at all
> -
>
> state = down
> -
>
> state = init
> -
>
> state = exstart
> -
>
> state = exchange
> -
>
> state = 2-way
> -
>
> state = loading
>
> There are other OSPF states, but those shown here are the most common ones
> seen in *show ip ospf neighbor* command output. For an explanation of all
> the OSPF neighbor states, refer to OSPF Neighbor
> States<
> http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a0080093f0e.shtml
> >
> .
>
>
> if unable to understand then try to read these article ...
>
>
> http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a0080094050.shtml
>
> http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a0080093f0e.shtml
>
>
>
> Regards,
> M. Faisal
>
>
>
> On Sat, Jan 30, 2010 at 10:55 AM, HEMANTH RAJ <hemanthrj_at_gmail.com> wrote:
>
> > Can anyone tell me the difference between ospf neighbor and adjacency?
> > Generally wat is the difference between neighbour and adjacency in any
> > routing protocol?
> >
> > --
> > Problems arise Bcoz we talk,prblms r not solve bcoz we dont talk So gud r
> > bad talk to ur affectionate one's freely
> >
> > Urs Friendly,
> > HP HEMANTH RAJ
> >
> >
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