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RE: Bridging on an MPLS network....

  • From: "Arun M. Thomas" <arunt@propulsionnetworks.com>
  • Date: Wed, 20 Feb 2002 15:59:21 -0800
  • Importance: Normal
  • Resent-Date: Wed, 20 Feb 2002 19:34:44 -0500
  • To: ".Mail List: MPLS Ops" <mpls-ops@mplsrc.com>

Hmmm....

Thanks for the responses!  I understand that in the two diagrams I supplied:

Diagram 1> 	(Ingress) A --> B --> C (Egress)
Diagram 2> 	A --> 1 --> 2 --> B --> 3 --> C

1, 2, and 3 could be bridges rather than routers (thanks Anoop).  I just
want to wind out if there are actually MPLS setups out there that look like
Diagram 2 rather than like Diagram 1.  From the responses, I would guess
that the answer is "Yes", but please correct me if I'm wrong!

-AMT

-----Original Message-----
From: Wade Edwards [mailto:wade.edwards@powerupnetworks.com]
Sent: Wednesday, February 20, 2002 2:52 PM
To: Anoop Ghanwani; Arun M. Thomas
Cc: .Mail List: MPLS Ops
Subject: RE: Bridging on an MPLS network....


1, 2 and 3 also must make sure it does not drop the packets due to being
oversized or the protocol type not being recognized.

L8r.

 -----Original Message-----
From: 	Anoop Ghanwani [mailto:anoop@lanterncom.com]
Sent:	Wednesday, February 20, 2002 4:12 PM
To:	'Arun M. Thomas'; .Mail List: MPLS Ops
Subject:	RE: Bridging on an MPLS network....


1, 2, and 3 can be bridges.  Why do you refer to as A, B, and C
as hosts instead of routers?

-Anoop

> -----Original Message-----
> From: Arun M. Thomas [mailto:arunt@propulsionnetworks.com]
> Sent: Wednesday, February 20, 2002 1:47 PM
> To: .Mail List: MPLS Ops; .Mail List: MPLS Spec
> Subject: Bridging on an MPLS network....
>
>
> This question is focused more at actual use of MPLs rather
> than at what the
> specs state about how it should be used.  Please let me know
> if this is an
> inappropriate forum for this question.
>
> I've been trying to understand the requirements as far as
> bridging and MPLS
> from a practical perspective.  Suppose, for example, that the
> following LSR
> exists on an Ethernet network:
>
> 	(Ingress) A --> B --> C (Egress)
>
> For any particular packet traversing this LSR, is it
> reasonable to expect
> that it will only touch three hosts enroute from A to C, or
> is it possible
> that there could be a multitude of intervening hosts?  e.g.
> Could the actual
> path the packet traverses look like:
>
> 	A --> 1 --> 2 --> B --> 3 --> C
>
> where 1, 2, and 3 represent switches performing L2 bridging?
>
> Thanks in advance for any comments.  They're much appreciated!
>
> -AMT
>
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