Re: NBMA ....IGP DOUBTS

NBMA mode deos not support broadcasts by default, so routing protocols
that use broadcast/multicast to communicate will not form adjacency.
Using frame-relay interface-dlci or the broadcast option on a static
frame map gets around this. If you don't have this, then you will need
neighbor statements.

If you specifiy the OSPF network type as broadcast you are signalling
two things. 1. That you expect to elect a DR and 2. That you will be
using "fast" timers 10/40 seconds.

On Sat, Jul 16, 2011 at 12:02 PM, imran ali <immrccie_at_gmail.com> wrote:
> HI experts
>
> 1 )since NBMA does not support multicast ..then how are we able to form
> adjacency on it ..for example rip and eigrp ..just turn the interface on and
> neighbors will come up .....without any need to configure neighbor commands
> ... is it that protocol has inbult features that sense underlying frame
> relay media and begins unicasting the neighbors as RIP and eigrp dont
> require " classical neighbor commands" as required by OSPF ...
>
>
> 2) on a frame network if we specify OSPF network type as " broadcast" does
> this turns the frame network that natively dosent support broadcast ...to
> suddenly start supporting broadcast ....
>
> 3) whats the funda with " broadcast " key word in frame relay static maps
> ... whats differce will it create if i dint specify it ...
>
> my routing protocols will not work if i dint specify it ?
>
>
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Received on Sat Jul 16 2011 - 12:15:43 ART