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Bridging on an MPLS network....

  • From: "Sukanta Ganguly" <sganguly@opulentsystems.com>
  • Date: Thu, 21 Feb 2002 07:36:02 -0800
  • X-MIME-Autoconverted: from quoted-printable to 8bit by cell.onecall.net id KAA04869

Arun,
  IF you have an LSR, as you mentioned, A ---> B ---> C, then the packets under MPLS will be enroute this exact path. However, if there is a lower layer VLAN setup, which for policy reason redirects the packet through different paths. Even then at the MPLS layer the other path would be unknown.

SG

*********** REPLY SEPARATOR  ***********

On 2/20/2002 at 1:46 PM Arun M. Thomas wrote:

>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