From: Alexander Arsenyev (GU/ETL) (alexander.arsenyev@ericsson.com)
Date: Mon Mar 28 2005 - 13:36:28 GMT-3
Useless broadcasts/multicasts consume bandwidth. FR multipoint interface may have many PVCs but all these PVCs have to share the same physical line.
Of course, replicating broadcast/multicast packets also consumes memory and CPU cycles.
Bottom line is - make sure that broadcast/multicast packets are sent only on those PVCs where necessary and that's my understanding of the function of the "broadcast" keyword.
HTH,
Cheers
Alex
-----Original Message-----
From: Dillon Yang [mailto:gzdillon@hotmail.com]
Sent: 28 March 2005 16:52
To: Alexander Arsenyev (GU/ETL)
Cc: Group Study
Subject: Re: NBMA in real word
Hi, Alexander:
Thanks.
But I want to know some real situation that the "broadcast" is harmful. Say, the cisco is a vendor that will not put a useless keyword into the IOS. If the command without "broadcast" has no specific usage, then it should be merged with the command with "broadcast" into a SINGLE command.
Any advice?
TIA
dillon
----- Original Message -----
From: "Alexander Arsenyev (GU/ETL)" <alexander.arsenyev@ericsson.com>
To: "'Dillon Yang'" <gzdillon@hotmail.com>; <ccielab@groupstudy.com>
Sent: Monday, March 28, 2005 11:19 PM
Subject: RE: NBMA in real word
> My 2 pence:
> 1) Good practice is NOT to map spoke-to-spoke with "broadcast" keyword, broadcasts from one spoke to another won't be propagated by hub anyway.
> 2) "broadcast" keyword also applies to multicast. Therefore, if Your task asks You to propagate mcast to a subset of spokes then map with "broadcast" only relevant (multicast-enabled) spokes.
> HTH,
> Cheers
> Alex
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]
> Sent: 28 March 2005 15:07
> To: Group Study
> Subject: NBMA in real word
>
>
> Hi, group:
>
> Normally, the command "frame-relay map ip xxx broad" works. But I never meet a situation that the FR link can not allow broadcast, anybody can explain what case the "broadcast" can not be allowed?
>
> TIA
> dillon
>
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