Re: Frame Relay

Right,
that's because it's an NBMA (non broadcast multiple access) L2 proto.

It may help thinking about how it works in layers. Addresses in L3 are
different than those in L2, and as the router is trying to reach a L3 NH
(next hop), it needs to map its address to the L2 NH.

The issue is what to map to the L3 broadcast destination. The broadcast
keyword makes up a list of L2 destinations (and the router ends up
making copies and sending one to each L2 address on the list)

-Carlos

Joe Astorino @ 30/05/2010 9:38 -0300 dixit:
> If you want to send broadcasts/multicasts on the PVC you need the broadcast keyword on your frame-map (assuming you are using frame-map for L3/L2 address resolution)
>
> Regards,
> Joe Astorino, CCIE #24347
>
> "He not busy being born is busy dying" -- Dylan
>
> ----- Original Message -----
> From: "faizan khurshid" <faizankhurshid921_at_hotmail.com>
> To: ccielab_at_groupstudy.com
> Sent: Sunday, May 30, 2010 6:51:03 AM GMT -05:00 US/Canada Eastern
> Subject: Frame Relay
>
> To Group :
>
>
> Want to resolve ambiguity
>
>
> In HUB & SPOKE topology if you try communicate between spoke to spoke and
> protocol your are using for communicate use broadcast and Multicast for their
> update use must add broadcast in frame-relay map command
> reason in frame relay treat each PVC treat as diff broadcast domain
>
>
> in other sources i read
>
>
> if you try to communicate between spokes let say R5 (spoke)want to
> communicate R4(spoke)and R3 is (hub)
>
> if R5 add broadcast keyword in frame-relay mapping and use R4 IP add
> when it reaches to R3 hub it has no idea where i have to send because of
> destination address is broadcast
> so we left off broadcast keyword to success-full communication
>
>
>
>
>
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-- 
Carlos G Mendioroz  <tron_at_huapi.ba.ar>  LW7 EQI  Argentina
Blogs and organic groups at http://www.ccie.net