From: Dillon Yang (gzdillon@hotmail.com)
Date: Mon Mar 28 2005 - 21:57:03 GMT-3
Hi, Alex:
I agree, too.
But, if the multicast traffic is really needed from a spoke to another, then the hub must be set p2p subinterface to each spoke, right? Or it waste the bandwidth by allowing the traffic pass the same interface twice.
Any advice?
TIA
dillon
----- Original Message -----
From: "Alexander Arsenyev (GU/ETL)" <alexander.arsenyev@ericsson.com>
To: "'Dillon Yang'" <gzdillon@hotmail.com>
Cc: "Group Study" <ccielab@groupstudy.com>
Sent: Tuesday, March 29, 2005 12:36 AM
Subject: RE: NBMA in real word
> 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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