Erik Mintz wrote:
>
> The short answer is no.
>
> Server1 requests a file from Server2.
> At router Chicago, a frame is created with a remote
> destination DLCI 100.
> Encapsulated in that frame is the packet with a destination of
> Server 1.FR
> is a layer two protocol. It only has info to forward the packet
> to the
> remote switch with DLCI 100. This is defined by the PVC mapping.
Sorry for the blank post. I pressed the post button when I meant quote. :-)
I just wanted to note that what goes in the FR header is your own DLCI, not
the remote one. You don't know the remote one. The switch figures that out
because of the manually configured switching table.
That's another difference from a LAN that we can add to Zsombor's message.
On a LAN switch, the frames come in with dest and src. MAC. Dest is used for
forwarding. (Src is also referenced to help build the switching table.)
On a FR switch, the frames come in with just one DLCI, the originating DLCI.
Someone can correct me if I'm wrong, but that's been my reading of it....
Priscilla
>
> Yes, shorter path would be to use the frame cloud to send it
> to DLCI 99
> directly. However, DLCI 86 and DLCI 99 are DTE devices that are
> not aware of
> each other.
>
> If the frame was addressed to DLCI 99 directly, it would be
> dropped by the
> carrier as a violation of the defined map. Since there are only
> ten bits
> available for addressing, DLCI numbers are reused for different
> customers.
>
> Chicago Miami
> [Server2] [Server 1]
> /\ /\
> DLCI 99 DLCI 86
> |____ ------|
> | |
> DLCI 100 DLCI 200
> |/\-----{HUB SITE}-----/\|
>
>
> Erik Mintz
>
>
> ----------
> >From: "Aaron Ajello"
> >To: [EMAIL PROTECTED]
> >Subject: FR concept question [7:71263]
> >Date: Tue, Jun 24, 2003, 1:05 PM
> >
>
> > This is probably a very simple concept question, but I've
> asked a couple
> > people and haven't gotten a solid answer.
> >
> > If I've got two frame relay spoke sites connected point to
> point with a hub
> > site and a server in one spoke site copies a file to a server
> in the other
> > spoke site, does all the traffic pass through the hub site,
> or is it
> > switched within the frame cloud?
> >
> > I guess what I'm wondering is does a frame cloud act somewhat
> like a lan,
> > where initially packets will go through the default gateway
> and be routed
> > and then the following packets will be switched?
> >
> > thanks.
>
>
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http://www.groupstudy.com/form/read.php?f=7&i=71299&t=71263
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