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Cell Relay Retreat>MPLS-OPS Archive>month:2001-Mar> msg00133



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RE: Questions about MPLS

  • From: "Robin Smith" <rosmith@cisco.com>
  • Date: Tue, 20 Mar 2001 07:57:57 -0000
  • Cc: "Yehuda Wieder" <yehuda@reduxcom.com>, <mpls-ops@mplsrc.com>
  • Importance: Normal
  • Resent-Date: Tue, 20 Mar 2001 04:47:30 -0500
  • To: "Christopher Lewis" <chrlewis@cisco.com>, "Sidnie Feit" <sfeit@vnet.net>

Christopher, see inline:

Rgds
Robin.

> This is not the case. In the days of tag switching, it was thought that
> lookups based on a fixed length label rather than a variable
> length prefix
> would be quicker, but that was before the days of hardware
> implementations
> in routers; there is no real performance improvement by adding MPLS to
> modern routers.

There will be if you do the tag lookup in HW too!

> MPLS QoS only copies what is available in the world of IP to
> begin with, it
> does not provide any additional QoS mechanisms.

Have you ever heard of IP+ATM CoS(IP enabling an ATM switch and use of ATM
IP CoS Q'ing)?

> IMHO there are three reasons to consider MPLS
>
> 1. To IP enable an ATM network
> 2. To provide traffic engineering functions to an IP network (PBR has
> issues when applied on a large scale)
> 3. Enable traffic separation in IP networks to support VPNs.

Agreed, primary market drivers


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