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ATM QoS classes in MPLS (?)
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From: Jeff Parker <jparker@axiowave.com>
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Date: Wed, 6 Jun 2001 10:02:23 -0400
Title: RE: ATM QoS classes in MPLS (?)
> Hi all,
> I'm doing some research about IP/ATM integration by
> implementing MPLS in
> ATM networks. I have some doubts regarding QoS issues:
> ATM routing protocols supporting ATM QoS classes (CBR, VBR, etc.) are
> replaced with IP routing protocols - does it mean that ATM-LSRs (not
> working in 'ships in the night' mode) support only int-serv
> and diff-serv
> models ? Do they use CAC function to deliver those QoS
> guarantees? How ATM
> cells carrying IP packet are treated in ATM-LSRs from QoS
> point of view?
>
> Thanks in advance for any help,
>
> Maks
We need another metaphor - "Ships in the night" suggests:
Suppose you book first class passage on
an ocean liner, with a suite. What happens to your
reservation if you find that your transport has been
changed to air rather than sea?
The problem of mapping between different models of service
is not an easy one.
- jeff parker
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